Vibrio vulnificus: Complete Guide to Symptoms, Diagnosis, Treatment, Prevention, and Epidemiology

Table of Contents

• Introduction to Vibrio vulnificus
• Classification and Taxonomy
• Morphology and Characteristics
• Habitat and Distribution
• Sources of Infection
• Modes of Transmission
• Virulence Factors
• Pathogenesis
• Diseases Caused by Vibrio vulnificus
• Signs and Symptoms
• Risk Factors
• Laboratory Diagnosis
• Treatment
• Prevention and Control
• Recent Cases and Epidemiology
• Conclusion
• References

Introduction to Vibrio vulnificus

• Vibrio vulnificus is a Gram-negative, halophilic (salt-loving), curved rod-shaped bacterium belonging to the family Vibrionaceae that naturally inhabits warm coastal, estuarine, and brackish water environments worldwide.
• It is an opportunistic human pathogen and zoonotic bacterium capable of infecting humans, fish, and other aquatic animals.
• The bacterium is commonly associated with shellfish, especially raw oysters, because filter-feeding mollusks can accumulate V. vulnificus from surrounding seawater.
• Human infection mainly occurs through consumption of raw or undercooked seafood or exposure of open wounds to contaminated seawater or brackish water.
• Vibrio vulnificus causes severe infections including primary septicemia, wound infections, necrotizing fasciitis, and gastroenteritis, with bloodstream and soft tissue infections being the most life-threatening forms.
• The infection can progress rapidly, leading to septic shock, multiple organ failure, and death, particularly when diagnosis and treatment are delayed.
• Although infections are relatively uncommon, V. vulnificus has one of the highest fatality rates among foodborne bacterial pathogens and accounts for the majority of seafood-associated deaths in some regions.
• Severe disease occurs mainly in individuals with chronic liver disease, diabetes, kidney disease, iron overload disorders, alcoholism, immunosuppression, or other underlying health conditions.
• Older adults, particularly men, are more frequently affected by severe V. vulnificus infections.
• The bacterium shows increased activity during warmer months because higher water temperatures promote bacterial growth and environmental persistence.
• Climate change and rising coastal temperatures are contributing to the expansion of V. vulnificus into new geographic regions.
• The pathogenic ability of V. vulnificus varies among strains due to extensive genetic diversity and differences in virulence-associated genes.
• Due to its rapid disease progression, high mortality, and association with seafood safety, V. vulnificus is considered one of the most important marine bacterial pathogens affecting public health.

Classification and Taxonomy of Vibrio vulnificus

• Vibrio vulnificus is a Gram-negative bacterium belonging to the genus Vibrio and family Vibrionaceae.
• The species was officially recognized as a distinct member of the genus Vibrio in 1976.
• The taxonomic classification of Vibrio vulnificus is:

Taxonomic Rank	Classification
Domain	Bacteria
Phylum	Pseudomonadota (Proteobacteria)
Class	Gammaproteobacteria
Order	Vibrionales
Family	Vibrionaceae
Genus	Vibrio
Species	Vibrio vulnificus

• Vibrio vulnificus is closely related to other medically important species including Vibrio cholerae, Vibrio parahaemolyticus, and Vibrio alginolyticus.
• Recent genomic studies have identified closely related species within the same evolutionary group, including Vibrio navarrensis and Vibrio cidicii.
• Traditionally, Vibrio vulnificus has been classified into three biotypes based on biochemical characteristics, host range, and epidemiological patterns.

Biotype	Primary Host	Distribution	Major Characteristics
Biotype 1	Humans	Worldwide	Most common cause of human infections; associated with raw seafood.
Biotype 2	Eels (occasionally humans)	Worldwide	Primarily infects fish; some strains are zoonotic.
Biotype 3	Humans	Mainly Israel	Rare hybrid lineage responsible for localized outbreaks.

• Biotype 1 is the predominant clinical biotype responsible for most human infections worldwide and contains clinical and environmental genotypes based on vcg gene variation.
• Biotype 2 mainly causes fish disease, but some strains such as serovar E can infect both aquatic animals and humans.
• Biotype 3 represents a genetically distinct lineage that developed through recombination between different V. vulnificus populations.
• Modern whole-genome studies show that biotype classification does not completely represent the evolutionary diversity of V. vulnificus.
• Horizontal gene transfer contributes to genetic variation, affecting virulence, environmental adaptation, and host specificity.
• Future classification systems are expected to rely more on whole-genome sequencing rather than traditional biochemical identification methods.

Morphology and Characteristics of Vibrio vulnificus

• Vibrio vulnificus is a curved, rod-shaped, Gram-negative bacterium with a typical Gram-negative cell envelope consisting of an outer membrane, thin peptidoglycan layer, and inner membrane.
• The bacterial cells are approximately 1.5–3 μm in length and are commonly observed as curved rods.
• It is a facultatively anaerobic bacterium, allowing growth in both oxygen-rich and oxygen-limited environments.
• The bacterium is motile due to a single polar flagellum, which supports movement, environmental survival, and host colonization.
• Vibrio vulnificus produces a capsular polysaccharide (CPS) that protects cells from immune attack and contributes significantly to virulence.
• Colony appearance varies according to CPS production and includes opaque, translucent, intermediate, and rugose morphotypes.

Morphotype	Capsule (CPS) Expression	Virulence	Characteristics
Opaque (Op)	High (CPS+)	Highly virulent	Produces abundant capsule; resistant to host immune defenses and efficiently utilizes host iron sources.
Translucent (Tr)	Absent or low (CPS−)	Avirulent or less virulent	Reduced capsule production; more susceptible to immune clearance.
Intermediate (Int)	Reduced CPS expression	Variable	Shows characteristics between opaque and translucent forms; may switch between colony types.
Rugose	Present	Variable	Associated with strong biofilm formation and enhanced environmental survival.

• The bacterium produces outer membrane vesicles (OMVs) that transport toxins, enzymes, and virulence molecules involved in infection.
• Important surface structures include capsular polysaccharide, lipopolysaccharide, flagella, pili, and OMVs, which contribute to adhesion, immune evasion, and disease development.
• Vibrio vulnificus produces extracellular enzymes including proteases, lipases, gelatinases, DNases, and mucinases that assist tissue invasion and nutrient acquisition.
• Major toxins include RtxA1 cytotoxin and VvhA hemolysin, which damage host cells and contribute to tissue destruction.
• Metalloproteases such as VvpE and VvpM promote infection by disrupting host tissue barriers.
• The bacterium forms biofilms that enhance survival on seafood surfaces, marine habitats, and environmental materials.
• Type III and Type VI secretion systems contribute to bacterial survival by delivering virulence proteins into host cells.
• The combination of capsule production, motility, biofilm formation, toxin secretion, and secretion systems makes V. vulnificus a highly aggressive marine pathogen.

Habitat and Distribution of Vibrio vulnificus

• Vibrio vulnificus naturally occurs in warm coastal, marine, and brackish water environments worldwide, particularly in estuaries where freshwater mixes with seawater and creates favorable conditions for bacterial survival (Baker-Austin & Oliver, 2020; Phillips & Satchell, 2017).
• The bacterium prefers warm aquatic environments with temperatures above 15°C and moderate salinity conditions ranging from 5–25 parts per thousand (ppt), which support growth and persistence in marine ecosystems.
• Vibrio vulnificus is a natural member of coastal microbial communities and can be detected in seawater, marine sediments, plankton, seaweed, fish, and shellfish, particularly oysters that accumulate bacteria through filter feeding (Baker-Austin & Oliver, 2018; Waidner & Potdukhe, 2023).
• Important environmental reservoirs of Vibrio vulnificus include:
• Coastal and estuarine waters
• Marine sediments
• Oysters and other molluscan shellfish
• Seaweed and aquatic surfaces
• Plankton-associated microbial communities

Environmental Factors Affecting Vibrio vulnificus Growth

• Water temperature is the strongest environmental factor controlling Vibrio vulnificus abundance. Bacterial populations increase significantly above 15°C, with the highest concentrations usually detected when temperatures exceed 25°C.
• The bacterium is uncommon in colder waters but becomes increasingly abundant as temperatures rise, resulting in strong seasonal variation in environmental detection.
• Salinity influences bacterial distribution, with optimal growth commonly occurring at moderate salinity levels around 15 ppt. Extremely low or high salinity conditions can reduce bacterial survival.
• Additional environmental factors affecting abundance include dissolved oxygen, turbidity, chlorophyll concentration, phytoplankton availability, and suspended organic particles, which influence nutrient availability and bacterial persistence.

Environmental Factor	Optimal Condition	Effect on Vibrio vulnificus Abundance
Water Temperature	Above 15°C (highest levels above 25°C)	Primary factor controlling bacterial growth, seasonal increase, and geographic distribution.
Salinity	5–25 ppt (optimal around 15 ppt)	Influences survival and distribution in coastal and estuarine environments.
Sediment Resuspension	Storms, waves, and coastal disturbances	Releases bacteria from sediments into the water column and increases exposure risk.
Chlorophyll & Phytoplankton	High productivity coastal waters	Provides association with plankton communities and nutrient sources supporting bacterial growth.
Dissolved Oxygen & Turbidity	Variable coastal conditions	Affects bacterial survival and concentration in marine ecosystems.

• Marine sediments act as important reservoirs of Vibrio vulnificus, often containing higher bacterial concentrations than surrounding water because they provide protection and nutrients for survival (Fleischmann et al., 2022; Lipp et al., 2001).

Seasonal Distribution and Natural Reservoirs

• Vibrio vulnificus shows strong seasonal variation, with the highest environmental concentrations occurring during warmer months when water temperatures increase.
• Oysters represent one of the most important reservoirs because they concentrate Vibrio vulnificus from surrounding seawater through filter feeding, increasing the risk of seafood-associated infections.
• More than 95% of oyster-associated Vibrio vulnificus cells are located within oyster tissues rather than on shell surfaces, making contaminated seafood a major exposure route.
• During colder seasons, bacterial levels decrease in seawater, but the organism may persist in oysters and sediments until favorable environmental conditions return.

Global Expansion and Climate Change Impact

• Increasing global temperatures are expanding suitable habitats for Vibrio vulnificus by creating warmer coastal environments that support bacterial survival and multiplication.
• In North America, warming coastal waters have contributed to a northward shift in Vibrio vulnificus infections, with previously uncommon regions reporting increasing cases.
• Climate-related factors influencing Vibrio vulnificus distribution include rising sea surface temperatures, sea level rise, coastal flooding, altered salinity patterns, and storm-driven sediment disturbance.
• Hurricanes and extreme weather events can increase infection risk by resuspending contaminated sediments and exposing humans to bacteria-containing floodwaters.
• Vibrio vulnificus has been reported across North America, Europe, Asia, and the Middle East, with China and the United States among the regions reporting high infection burdens.
• Complete elimination of Vibrio vulnificus from marine environments is not possible because the bacterium contributes to ecological processes such as nutrient cycling and degradation of organic materials including chitin.

Sources of Infection of Vibrio vulnificus

• Vibrio vulnificus infections occur mainly through two primary exposure routes: consumption of contaminated raw or undercooked seafood and direct contact of wounds with contaminated seawater or marine organisms.
• Filter-feeding shellfish, especially raw oysters, are the most important source of foodborne infection because they accumulate and concentrate V. vulnificus from surrounding coastal waters.
• Human infections commonly result from:
• Eating raw or undercooked shellfish
• Exposure of open wounds to contaminated seawater
• Injuries occurring during seafood handling

Source of Infection	Transmission Mechanism	Clinical Outcome	Common Examples
Raw seafood	Consumption of contaminated raw or undercooked shellfish containing high bacterial loads	Primary septicemia, gastroenteritis	Raw oysters, clams, and other molluscan shellfish
Contaminated seawater	Entry of bacteria through cuts, wounds, or damaged skin exposed to contaminated coastal water	Wound infection, cellulitis, necrotizing fasciitis	Swimming, fishing, boating, and coastal activities
Seafood handling injuries	Direct inoculation of bacteria through injuries caused while handling contaminated seafood	Skin and soft tissue infection	Oyster shucking injuries, fish-related wounds
Frozen or processed seafood	Exposure due to contaminated products, improper handling, or insufficient cooking	Foodborne infection, especially in high-risk individuals	Frozen seafood products

Exposure Activity	Risk Source	Possible Infection Route
Eating raw oysters	Concentrated bacteria inside shellfish tissues	Ingestion → bloodstream infection
Swimming in coastal waters	Exposure of wounds to contaminated seawater	Skin entry → wound infection
Seafood preparation	Cuts from contaminated shellfish or marine animals	Direct wound inoculation
Storm or flood exposure	Resuspended bacteria from marine sediments	Environmental wound exposure

Seafood-Associated Transmission

• Raw oysters represent the most frequently reported seafood source of V. vulnificus infection because they filter large volumes of seawater and accumulate bacteria within their tissues.
• In highly contaminated environments, bacterial concentrations inside oyster tissues may reach approximately 10⁵ CFU/g, greatly exceeding levels found in surrounding seawater.
• Foodborne infection is particularly severe in individuals with underlying conditions such as liver disease, diabetes, iron overload disorders, or weakened immunity because bacteria can rapidly enter the bloodstream and cause septicemia.

Wound-Associated Transmission

• Wound infections occur when damaged skin comes into contact with V. vulnificus-contaminated seawater, marine animals, or seafood-processing environments.
• Common exposure activities include swimming, fishing, boating, seafood preparation, and handling shellfish.
• These infections may progress rapidly into severe soft tissue disease, including necrotizing fasciitis, requiring urgent medical intervention.
• Wound-associated infections represent a substantial proportion of reported cases, especially in coastal regions where human activities overlap with contaminated marine environments.

Seasonal and Geographic Patterns of Infection Sources

• Human infections increase during warmer months because higher water temperatures promote bacterial multiplication in coastal environments.
• Most cases occur between May and October in temperate regions, corresponding with increased bacterial abundance in seawater and seafood reservoirs.
• Climate change, rising sea surface temperatures, coastal flooding, and extreme weather events are expanding the geographical range of exposure by creating more suitable habitats for V. vulnificus.
• Global seafood transportation has also contributed to infections occurring outside traditional coastal areas by increasing human exposure to contaminated marine products.

Modes of Transmission of Vibrio vulnificus

• Vibrio vulnificus causes human infections mainly through two major transmission routes: consumption of contaminated raw or undercooked seafood and exposure of open wounds to contaminated seawater or aquatic sources.
• Filter-feeding shellfish, especially oysters, accumulate V. vulnificus from surrounding waters and serve as the primary vehicle for seafood-associated infections.

Transmission Route	Mechanism	Main Source	Clinical Outcome
Seafood ingestion	Consumption of raw or undercooked contaminated seafood	Raw oysters and other shellfish	Primary septicemia and gastroenteritis
Wound exposure	Entry through cuts, wounds, or damaged skin exposed to contaminated water	Coastal seawater, brackish water, floodwater	Cellulitis, wound infection, necrotizing fasciitis
Seafood handling	Injury during seafood processing or handling infected aquatic animals	Oyster shucking and fish handling	Localized wound infection and bacteremia
Food supply chain contamination	Improper storage, transportation, or cross-contamination	Processed and frozen seafood products	Foodborne infection in susceptible individuals

Seafood-Associated Transmission

• Raw oysters are the most frequently reported source of V. vulnificus infection because they efficiently concentrate bacteria through filter feeding.
• In warm coastal regions, oyster contamination increases significantly during summer months when environmental conditions favor bacterial multiplication.
• The bacterium can reach high concentrations inside shellfish tissues, allowing ingestion of contaminated seafood to deliver a sufficient bacterial load for infection, particularly in high-risk individuals.
• Foodborne infection most commonly leads to primary septicemia, especially in individuals with underlying conditions such as liver disease, diabetes, or immune suppression.

Wound-Associated Transmission

• Wound infections occur when damaged skin comes into contact with contaminated seawater during activities such as swimming, fishing, boating, or water sports.
• Occupational exposure during seafood processing, oyster shucking, or handling infected fish can introduce the bacterium directly into wounds.
• V. vulnificus can also infect aquatic animals and may transmit from infected fish to humans during handling, demonstrating its zoonotic potential.
• Wound-associated infections may rapidly progress to severe soft tissue disease, including necrotizing fasciitis and bloodstream infection.

Emerging and Rare Transmission Routes

• Rare transmission events have been reported through unusual exposures, including insect bites and infections without clear seafood or seawater exposure history.
• Global seafood trade and changing environmental conditions are contributing to infections in inland regions that traditionally had limited exposure risk.
• Improper seafood processing, storage, and transportation can allow bacterial persistence and increase contamination risk throughout the food supply chain.
• Biofilm formation on seafood-processing surfaces may contribute to long-term environmental persistence and contamination if proper sanitation practices are not followed.

Virulence Factor of Vibrio vulnificus

Vibrio vulnificus possesses a complex array of virulence factors that enable rapid progression of septicemia, wound infections, and necrotizing fasciitis. The pathogen combines structural components, toxins, extracellular enzymes, and secretion systems to evade host immunity, damage tissues, and enhance survival within human and environmental hosts.

Structural Virulence Factors

Virulence Factor	Mechanism	Contribution to Pathogenesis
Capsular polysaccharide (CPS)	Prevents phagocytosis and increases resistance to complement-mediated killing	Major virulence determinant enabling survival inside the human host
Flagellum and pili	Provides motility, adhesion, and interaction with host tissues	Promotes colonization and tissue invasion
Lipopolysaccharide (LPS)	Outer membrane component that activates inflammatory responses	Contributes to systemic inflammation and septic shock
Outer membrane vesicles (OMVs)	Transport toxins, enzymes, and virulence-associated molecules	Promotes bacterial translocation and host cell damage

Capsular Polysaccharide and Colony Phase Variation

• Capsular polysaccharide (CPS) is considered the primary virulence determinant of V. vulnificus because it protects bacterial cells from immune clearance and enhances survival during bloodstream infection.
• The bacterium undergoes phase variation between different colony forms. Opaque colonies produce abundant CPS and show high virulence, whereas translucent colonies produce reduced or absent CPS and display lower virulence.
• CPS expression also influences bacterial behavior, including biofilm formation, motility, and environmental persistence.
• OMVs produced by V. vulnificus contain enzymes such as serine proteases that promote host cell detachment and support bacterial movement across epithelial barriers.

Morphotype	CPS Expression	Virulence	Characteristics
Opaque	High CPS (+)	Highly virulent	Strong capsule production and immune resistance
Translucent	Low or absent CPS (-)	Reduced virulence	More susceptible to immune clearance
Intermediate	Reduced CPS expression	Variable	Can switch between colony states
Rugose	Present	Variable	Associated with enhanced biofilm formation

Exotoxins and Extracellular Enzymes

Vibrio vulnificus produces several potent toxins and enzymes that contribute to tissue destruction, immune disruption, and systemic disease.

Virulence Molecule	Function	Disease Effect
MARTX toxin (RtxA1)	Causes cytoskeletal disruption, actin aggregation, and necrotic cell death	Promotes tissue injury and severe infection progression
VvhA hemolysin	Forms pores in host cell membranes and induces cell death pathways	Causes hemolysis and contributes to septic shock
VvpE and VvpM metalloproteases	Degrade extracellular matrix and disrupt epithelial barriers	Facilitates tissue invasion and bacterial spread
Phospholipase A2 (PlpA)	Damages host cell membranes	Enhances cytotoxic effects
Hydrolytic enzymes	Includes proteases, lipases, lecithinase, and DNases	Supports nutrient acquisition and tissue degradation

Secretion Systems and Virulence Regulation

• Vibrio vulnificus contains specialized secretion systems that enhance pathogenicity and bacterial competition.
• Type III secretion system (T3SS) enables delivery of effector proteins into host cells, altering host cellular functions.
• Type VI secretion system (T6SS) contributes to bacterial competition, environmental survival, and virulence. T6SS1-positive strains contain additional genomic islands associated with increased virulence potential.
• T6SS activity is environmentally regulated and can be influenced by factors such as salinity, allowing adaptation to different ecological conditions.

Regulation of Virulence Expression

• Virulence factor production in V. vulnificus is controlled by complex regulatory networks that respond to environmental signals and host conditions.
• The second messenger molecule c-di-GMP regulates toxin production, with increased levels reducing cytotoxic activity.
• Regulatory proteins including HlyU, IscR, and NagC control expression of major toxin genes such as rtxA, vvhA, and plpA, making them potential targets for antivirulence strategies.
• Although several virulence-associated genes have been identified, pathogenic potential cannot always be predicted from genetic markers alone. Environmental strains carrying known virulence genes may show different levels of disease-causing ability due to unknown regulatory mechanisms.

Pathogenesis of Vibrio vulnificus

• Vibrio vulnificus causes severe human disease through a coordinated pathogenic process involving tissue destruction, immune evasion, iron acquisition, and bacterial dissemination. The pathogen produces multiple virulence factors that allow rapid multiplication, bloodstream invasion, and extensive tissue damage.
• The infection mainly occurs in two clinical forms:
• Primary septicemia following ingestion of contaminated seafood, particularly raw oysters.
• Necrotizing wound infections following exposure of damaged skin to contaminated seawater or marine animals.
• Successful infection depends on the ability of V. vulnificus to overcome host immune defenses, acquire essential nutrients, and regulate virulence factor expression according to environmental conditions.
• Despite identification of several virulence-associated genes, disease severity cannot be accurately predicted by genotype alone because environmental adaptation and regulatory mechanisms strongly influence pathogenic potential.
  

Pathogenic Mechanism	Evidence Strength	Role in Vibrio vulnificus Pathogenesis
Exotoxin-mediated tissue destruction	Strong (8/10)	MARTX toxin and VvhA hemolysin induce cytotoxicity, necrotic cell death, and tissue damage, promoting intestinal invasion and bloodstream dissemination (Tsyrulina et al., 2022; Higashiyama et al., 2024; Elgaml & Miyoshi, 2017).
Immune evasion through capsular polysaccharide	Strong (8/10)	Capsular polysaccharide protects V. vulnificus from phagocytosis and complement-mediated killing, allowing survival during septicemia (Jones & Oliver, 2009; Candelli et al., 2025; Horseman & Surani, 2011).
Iron acquisition	Moderate (7/10)	The bacterium exploits host iron sources, especially transferrin-bound iron, to support rapid multiplication and severe systemic infection (Leng et al., 2019; Lu et al., 2023).
Outer membrane vesicle (OMV)-mediated virulence delivery	Moderate (6/10)	OMVs transport virulence-associated molecules including serine proteases that promote host cell detachment and macrophage dysfunction through TNF signaling pathways (Higashiyama et al., 2024; Li et al., 2026).
Biofilm formation and colonization	Moderate (6/10)	Environmental signals regulate c-di-GMP pathways, influencing biofilm formation, bacterial persistence, and transition between environmental survival and host infection states (Choi & Choi, 2022; Yang et al., 2025).

Exotoxin-Mediated Tissue Destruction

• The MARTX toxin (RtxA1) is a major contributor to V. vulnificus pathogenicity. It induces cytoskeletal disruption, programmed necrotic cell death, and tissue injury, facilitating bacterial spread.
• VvhA hemolysin damages host cells through cytolytic activity and contributes to intestinal invasion, bloodstream dissemination, and septic shock development.
• The absence of major cytolysins significantly reduces intestinal infection capability, highlighting their importance in tissue invasion and systemic disease progression.
• The VvpE metalloprotease promotes bacterial invasion by:
• Disrupting intestinal epithelial tight junctions.
• Degrading type IV collagen in vascular basement membranes.
• Contributing to edema, hemorrhage, and skin tissue destruction.
• Outer membrane vesicles (OMVs) transport proteolytic enzymes that enhance bacterial dissemination by inducing host cell detachment and altering immune cell function.
• OMVs taken up by macrophages activate TNF signaling pathways, resulting in mitochondrial dysfunction and enhanced inflammatory damage.

Immune Evasion and Host Susceptibility

• The capsular polysaccharide (CPS) is essential for bloodstream survival because it protects V. vulnificus from phagocytosis and complement-mediated destruction.
• Severe infections are strongly associated with underlying host conditions, with more than 95% of primary septicemia patients having predisposing factors.
• Major risk factors include:
• Chronic liver disease.
• Diabetes mellitus.
• Immunosuppression.
• Hemochromatosis and other iron-overload conditions.
• These conditions increase disease severity because elevated available iron supports rapid bacterial growth and systemic infection.
• Severe infections occur more frequently in older adults and males, with men representing approximately 85% of reported cases.

Iron Acquisition and Rapid Bacterial Multiplication

• Iron availability is a critical factor determining the progression of V. vulnificus infection.
• The bacterium efficiently exploits host iron sources, particularly in individuals with increased serum iron levels due to liver disease or iron-storage disorders.
• Elevated iron availability enhances bacterial replication and contributes to rapid progression from localized infection to septicemia.

Regulatory Networks Controlling Pathogenesis

• V. vulnificus regulates virulence factor production through complex networks that respond to environmental conditions, nutrient availability, bacterial density, and stress signals.
• The secondary messenger c-di-GMP regulates:
• Biofilm formation.
• Motility.
• Toxin production.
• Increased c-di-GMP levels can suppress expression of certain toxins, including MARTX toxin and metalloproteases, demonstrating the balance between environmental survival and host infection strategies.
• Quorum sensing systems, including autoinducer-2 signaling, regulate bacterial transitions between surface-associated biofilm states and free-living infectious forms.

Genetic Diversity and Unresolved Pathogenic Mechanisms

• The presence of virulence-associated genes does not always predict disease severity because environmental strains carrying markers such as rtxA1, vvhA, and vcgC show variable pathogenicity.
• Horizontal gene transfer contributes to continuous genomic variation, allowing adaptation to different environmental niches and hosts.
• Some virulence-associated traits may primarily support environmental survival rather than direct human infection, making V. vulnificus pathogenicity a complex interaction between genetics, environment, and host susceptibility.

Diseases Caused by Vibrio vulnificus of Vibrio vulnificus

Vibrio vulnificus causes a spectrum of illnesses ranging from mild gastrointestinal disease to rapidly progressive, life-threatening septicemia and necrotizing soft tissue infections. The type and severity of disease depend on the route of exposure, bacterial virulence, underlying medical conditions, and the host immune response. Infection most commonly follows the consumption of raw or undercooked seafood, particularly oysters, or exposure of open wounds to contaminated seawater or marine animals.

The major diseases caused by V. vulnificus include:

• Primary septicemia following ingestion of contaminated seafood, particularly raw oysters.
• Necrotizing wound infections after exposure of open wounds to seawater, shellfish, or marine animals.
• Acute gastroenteritis following ingestion of contaminated seafood.
• Secondary bacteremia, in which bloodstream infection develops from severe wound infections or gastrointestinal disease.
• Rare invasive infections, including pneumonia, meningitis, osteomyelitis, endocarditis, spontaneous bacterial peritonitis, and endophthalmitis, primarily in immunocompromised individuals.

Primary Septicemia

Primary septicemia is the most severe disease caused by V. vulnificus and occurs after ingestion of contaminated raw or undercooked seafood. Following intestinal invasion, the bacterium rapidly enters the bloodstream, leading to fulminant sepsis and multiorgan failure. Mortality frequently exceeds 50%, making it one of the deadliest foodborne bacterial infections worldwide.

Key characteristics include:

• Rapid bloodstream invasion after seafood consumption.
• High incidence of septic shock and multiorgan dysfunction.
• Frequent development of hemorrhagic bullae and necrotic skin lesions.
• Highest mortality among all V. vulnificus infections.

Wound Infection

Wound infection develops when open wounds or skin abrasions come into contact with contaminated seawater, shellfish, fish spines, or other marine organisms. Infection progresses rapidly from localized cellulitis to necrotizing fasciitis if untreated. Early antibiotic therapy combined with prompt surgical debridement is essential to reduce mortality and prevent limb loss.

Key characteristics include:

• Infection after seawater or marine animal exposure.
• Rapid progression from cellulitis to soft tissue necrosis.
• May require emergency surgical debridement or amputation.
• Higher risk in individuals with chronic liver disease or diabetes.

Gastroenteritis

Gastroenteritis is generally the mildest manifestation of V. vulnificus infection and usually follows ingestion of contaminated seafood. Most infections are self-limiting and resolve with supportive care in healthy individuals. However, susceptible patients may progress to invasive disease and bacteremia.

Key characteristics include:

• Acute diarrhea following seafood consumption.
• Nausea, vomiting, abdominal cramps, and watery diarrhea.
• Usually self-limiting.
• Rare progression to septicemia in high-risk individuals.

Rare Invasive Infections

Although uncommon, V. vulnificus may infect organs outside the gastrointestinal tract and skin, particularly in immunocompromised patients or those with chronic liver disease. These infections usually result from hematogenous dissemination and are associated with poor clinical outcomes.

Reported rare manifestations include:

• Pneumonia.
• Meningitis.
• Osteomyelitis.
• Endocarditis.
• Endophthalmitis.
• Spontaneous bacterial peritonitis.
• Deep soft tissue abscesses.

Signs and Symptoms of Vibrio vulnificus

The clinical presentation of Vibrio vulnificus infection varies according to the site of infection and disease severity. Symptoms may develop within 12–72 hours after exposure and can progress rapidly, especially in patients with chronic liver disease, diabetes mellitus, iron overload disorders, or immunosuppression.

General Signs and Symptoms

Common systemic manifestations include:

• Sudden onset of fever.
• Chills and rigors.
• Generalized weakness and fatigue.
• Malaise.
• Nausea and vomiting.
• Abdominal pain.
• Headache.
• Hypotension in severe infections.

Signs and Symptoms of Primary Septicemia

Primary septicemia is characterized by rapid systemic deterioration and requires immediate medical attention.

Common clinical features include:

• High-grade fever.
• Severe chills.
• Nausea and vomiting.
• Abdominal discomfort.
• Hypotension progressing to septic shock.
• Tachycardia.
• Altered mental status.
• Disseminated intravascular coagulation (DIC).
• Multiorgan dysfunction.
• Hemorrhagic bullae.
• Extensive skin necrosis.
• Cyanosis of the extremities.

Signs and Symptoms of Wound Infection

Cutaneous infections usually begin at the site of bacterial entry and may spread rapidly into deeper tissues.

Typical findings include:

• Localized pain that is often disproportionate to physical findings.
• Erythema.
• Swelling (edema).
• Warmth around the wound.
• Cellulitis.
• Hemorrhagic bullae.
• Ecchymosis.
• Tissue necrosis.
• Purulent discharge in some cases.
• Necrotizing fasciitis.
• Rapid progression to septic shock in severe infections.

Signs and Symptoms of Gastroenteritis

Gastrointestinal disease is generally mild and self-limiting.

Common symptoms include:

• Watery diarrhea.
• Nausea.
• Vomiting.
• Abdominal cramps.
• Mild fever.
• Loss of appetite.
• Dehydration in severe cases.

Symptoms Requiring Emergency Medical Attention

Patients should seek immediate medical care if they develop:

• Rapidly spreading skin redness or swelling.
• Hemorrhagic blisters (bullae).
• Severe limb pain.
• Confusion or altered consciousness.
• Persistent hypotension.
• Difficulty breathing.
• Signs of septic shock.
• Decreased urine output.
• Cyanosis or black discoloration of the skin.

These findings suggest invasive V. vulnificus infection with a high risk of septic shock and multiorgan failure, requiring urgent antimicrobial therapy and, when indicated, surgical management.

Risk Factors of Vibrio vulnificus

Vibrio vulnificus infection develops when susceptible individuals are exposed to contaminated seafood or warm coastal waters. Although healthy individuals can become infected, severe disease occurs predominantly in people with underlying medical conditions that impair immune defenses or increase serum iron availability. Environmental exposure, seafood consumption, and host-related factors together determine the likelihood of infection and disease severity.

Major Medical Risk Factors

Individuals with the following conditions have a substantially increased risk of severe Vibrio vulnificus infection and septicemia:

• Chronic liver disease, including cirrhosis, hepatitis, and alcoholic liver disease, is the strongest risk factor for invasive infection.
• Iron overload disorders, such as hereditary hemochromatosis, promote rapid bacterial growth because V. vulnificus requires iron for multiplication.
• Diabetes mellitus increases susceptibility to severe wound infections and bloodstream infections.
• Immunocompromised conditions, including HIV/AIDS, malignancy, chemotherapy, organ transplantation, and corticosteroid therapy, reduce host defense against infection.
• Chronic kidney disease and end-stage renal disease are associated with an increased risk of invasive disease.

Food-Related Risk Factors

Consumption of contaminated seafood is the primary source of foodborne infection.

• Eating raw or undercooked oysters is the most important dietary risk factor for primary septicemia.
• Raw clams, mussels, and other shellfish harvested from contaminated coastal waters may also transmit the bacterium.
• Seafood that is improperly refrigerated or handled after harvesting allows bacterial multiplication, increasing infection risk.
• Individuals with chronic liver disease or immunocompromising conditions should avoid consuming raw shellfish because of the high risk of fatal septicemia.

Environmental and Occupational Risk Factors

Direct exposure to contaminated marine environments increases the likelihood of wound infection.

• Open wounds exposed to seawater, estuaries, or marine animals are at increased risk of infection.
• Fishing, oyster harvesting, seafood processing, boating, and swimming in coastal waters increase exposure to the bacterium.
• Cuts, abrasions, burns, insect bites, or surgical wounds provide entry points for bacterial invasion.
• Shellfish-related puncture wounds can rapidly progress to severe cellulitis and necrotizing fasciitis if untreated.

Demographic Risk Factors

Certain demographic characteristics are consistently associated with severe Vibrio vulnificus infection.

• Most reported cases occur in males, representing approximately 85–90% of infections.
• Adults older than 40 years are affected more frequently than younger individuals.
• Heavy alcohol consumption increases susceptibility, even in patients without diagnosed liver disease.
• Individuals with multiple chronic illnesses have a significantly higher risk of developing septicemia than healthy individuals.

Seasonal and Climate-Related Risk Factors

Environmental conditions strongly influence the distribution of V. vulnificus.

• The bacterium proliferates in warm, brackish coastal waters, particularly when water temperatures exceed approximately 18°C.
• Human infections peak during the summer and early autumn when seawater temperatures are highest.
• Rising global temperatures and climate change have expanded the geographic range and seasonal occurrence of V. vulnificus, increasing the risk of infection in previously unaffected coastal regions.
• Extreme weather events, including hurricanes, flooding, and storm surges, can increase human exposure to contaminated coastal waters.

Laboratory Diagnosis of Vibrio vulnificus 

Early laboratory diagnosis of Vibrio vulnificus infection is essential because the disease can progress rapidly to septicemia, necrotizing fasciitis, and multiorgan failure. Prompt identification allows clinicians to initiate appropriate antibiotic therapy and surgical management, significantly improving patient outcomes.

Specimen Collection

The choice of clinical specimen depends on the type of infection.

• Blood cultures are recommended for suspected septicemia.
• Wound swabs, tissue biopsies, aspirates, or wound exudates should be collected from skin and soft tissue infections.
• Stool specimens may be examined in patients with gastroenteritis following seafood consumption, although isolation is less common.
• Whenever possible, specimens should be collected before initiating antibiotic therapy to maximize bacterial recovery.

Culture and Phenotypic Identification

Culture remains the gold standard for confirming Vibrio vulnificus infection.

• The bacterium grows on routine laboratory media, including blood agar and MacConkey agar.
• Thiosulfate-citrate-bile salts-sucrose (TCBS) agar is the preferred selective medium for isolating Vibrio species from mixed clinical or environmental specimens.
• Colonies are identified using biochemical characteristics, automated identification systems, or MALDI-TOF mass spectrometry where available.
• Culture confirmation generally requires 24–48 hours and may be delayed in patients who have already received antibiotics.

Molecular Diagnostic Methods

PCR-based techniques provide faster and more sensitive detection than conventional culture, particularly in critically ill patients or when bacterial numbers are low.

Diagnostic Method	Primary Target	Main Advantages
Culture and Biochemical Identification	Whole bacterial isolate	Gold standard for confirming Vibrio vulnificus; enables species identification and antimicrobial susceptibility testing.
Real-time PCR	vvhA gene	Rapid, highly sensitive, and species-specific detection directly from clinical specimens.
Nested PCR	vvhA gene	Provides very high analytical sensitivity, making it useful for detecting low bacterial loads.
Multiplex PCR	vvhA, vcg, pilF	Simultaneously detects V. vulnificus and differentiates clinically important strains from environmental isolates.
Isothermal Amplification (RPA/RAA-CRISPR)	vvhA gene	Rapid detection with minimal laboratory equipment, making it suitable for point-of-care and resource-limited settings.
Metagenomic Next-Generation Sequencing (mNGS)	Whole microbial genome	Identifies Vibrio vulnificus and other pathogens directly from clinical specimens, especially in culture-negative or diagnostically challenging infections.

Polymerase Chain Reaction (PCR)

PCR has become one of the most important molecular methods for diagnosing V. vulnificus infection.

• Most PCR assays target the species-specific vvhA hemolysin gene because of its high diagnostic accuracy.
• Real-time PCR enables rapid identification directly from clinical specimens, often before culture results become available.
• Multiplex PCR can simultaneously detect V. vulnificus alongside other clinically important Vibrio species.
• Detection of virulence-associated genes such as vcg and pilF may help distinguish highly pathogenic clinical strains from environmental isolates.

Metagenomic Next-Generation Sequencing (mNGS)

Metagenomic next-generation sequencing is increasingly used for severe or culture-negative infections.

• mNGS can identify V. vulnificus directly from blood or tissue samples without prior bacterial culture.
• It is particularly valuable when antibiotics have already been administered, reducing the likelihood of positive cultures.
• mNGS can simultaneously detect multiple pathogens in polymicrobial infections.
• Although highly sensitive, mNGS remains expensive and is generally reserved for complicated or diagnostically challenging cases.

Additional Laboratory Findings

Routine laboratory investigations support clinical diagnosis but are not specific.

• Leukocytosis with neutrophilia is commonly observed.
• Elevated C-reactive protein (CRP) and procalcitonin indicate severe bacterial infection.
• Blood cultures are frequently positive in septicemic patients.
• Patients with severe infection may develop thrombocytopenia, coagulopathy, elevated liver enzymes, metabolic acidosis, and renal dysfunction due to septic shock.

Treatment of Vibrio vulnificus 

Vibrio vulnificus infection is a medical emergency that requires immediate antibiotic therapy, early surgical intervention, and intensive supportive care. Delayed treatment markedly increases mortality, particularly in patients with septicemia and necrotizing soft tissue infections. Because disease progression is extremely rapid, empiric treatment should begin as soon as infection is suspected, without waiting for laboratory confirmation.

Recommended Treatment Approaches

Evidence Strength	Treatment Recommendation
Strong (9/10)	Third-generation cephalosporin + doxycycline (ceftriaxone or ceftazidime with doxycycline) is the recommended first-line treatment for severe Vibrio vulnificus infection. A fluoroquinolone may be used as an effective alternative (Horseman & Surani, 2011; Yun & Kim, 2018; Li et al., 2025).
Strong (8/10)	Early surgical debridement within 12–24 hours is essential for necrotizing fasciitis because antibiotics alone cannot eliminate extensive necrotic tissue. Early surgery significantly improves survival (Qiao et al., 2024; Wang et al., 2026; Severance et al., 2023).
Moderate (7/10)	Fluoroquinolone-containing regimens are associated with lower mortality (approximately 16.7%) than no antibiotic treatment and can be used when clinically appropriate (Wong et al., 2015).

Antibiotic Therapy

• Begin empiric antibiotic therapy immediately when V. vulnificus infection is suspected because delaying treatment significantly increases mortality.
• Preferred first-line regimen consists of a third-generation cephalosporin (ceftriaxone or ceftazidime) combined with doxycycline.
• Fluoroquinolones such as ciprofloxacin or levofloxacin can be used as effective alternatives and have shown comparable efficacy in experimental studies.
• Cephalosporin monotherapy is generally discouraged because combination therapy provides better clinical outcomes and lower mortality.
• Antibiotics with good tissue penetration are preferred for necrotizing skin and soft tissue infections because the organism rapidly invades deep tissues.

Surgical Management

• Early surgical debridement is the most important intervention for necrotizing soft tissue infections.
• Remove all necrotic and infected tissue to reduce bacterial burden and prevent further spread.
• Repeat surgical exploration may be required until healthy tissue margins are achieved.
• Fasciotomy, incision and drainage, skin grafting, or limb amputation may be necessary in advanced necrotizing fasciitis.

Supportive Care

• Admit patients with severe infection to an intensive care unit (ICU) for continuous monitoring.
• Provide aggressive intravenous fluid resuscitation to treat septic shock.
• Administer vasopressors if hypotension persists despite adequate fluid replacement.
• Initiate renal replacement therapy when acute kidney injury develops.
• Correct electrolyte disturbances, disseminated intravascular coagulation (DIC), and multiple organ dysfunction as clinically indicated.

Emerging and Investigational Therapies

• Researchers are investigating tigecycline as an alternative treatment for multidrug-resistant V. vulnificus infections.
• Hemopurification combined with antibiotics has shown promising results in selected patients with septic shock.
• Novel approaches under investigation include:
• Virulence-targeted therapies.
• Anti-toxin strategies.
• Immunomodulatory therapies.
• Multivalent vaccines targeting RtxA1 and VvhA toxins.
• Nanoparticle-based drug delivery systems.

Prognosis

• Early diagnosis and treatment substantially improve survival.
• Mortality exceeds 50% in primary septicemia despite treatment.
• Delaying antibiotic therapy beyond 72 hours is associated with an extremely poor prognosis and may approach 100% mortality in severe septicemia.
• The combination of rapid antibiotic administration, early surgical debridement, and comprehensive intensive care provides the best chance of survival.

Prevention and Control of Vibrio vulnificus

Preventing Vibrio vulnificus infection focuses on safe seafood consumption, protection of open wounds from marine environments, post-harvest seafood processing, and public health surveillance. Individuals with chronic liver disease, iron overload disorders, diabetes, or immunocompromising conditions are at the highest risk of severe infection and should take extra precautions.

Personal and Food Safety Measures

• Avoid eating raw or undercooked oysters and other shellfish, particularly if you have chronic liver disease, diabetes, hemochromatosis, or a weakened immune system.
• Cook seafood thoroughly to destroy V. vulnificus before consumption.
• Prevent cross-contamination by keeping raw seafood separate from cooked foods and using clean utensils and cutting boards.
• Wear protective gloves when handling raw shellfish or seafood to reduce the risk of skin injuries and bacterial exposure.
• Avoid exposing open wounds, cuts, or abrasions to warm seawater or brackish water. If exposure occurs, wash the wound immediately with clean water and seek medical attention if signs of infection develop.
• Refrigerate seafood immediately after harvesting or purchase to limit bacterial multiplication.

Post-Harvest Seafood Interventions

Intervention	Evidence Strength	Purpose
Cold chain maintenance	Strong (9/10)	Maintains refrigeration throughout storage and transport to prevent bacterial multiplication in seafood (Koutsoumanis et al., 2024).
Mild heat treatment (≈50°C)	Moderate (7/10)	Reduces Vibrio counts through controlled thermal treatment while maintaining product quality (Koutsoumanis et al., 2024).
High-pressure processing (HPP)	Moderate (7/10)	Inactivates V. vulnificus in oysters without applying heat (Koutsoumanis et al., 2024).
Depuration	Moderate (6/10)	Purifies live shellfish under controlled conditions, although effectiveness varies (Koutsoumanis et al., 2024).
Flash freezing	Moderate (6/10)	Reduces viable bacterial populations during long-term frozen storage (Koutsoumanis et al., 2024).

Environmental and Aquaculture Control

• Reduce nutrient pollution and eutrophication in coastal waters to limit phytoplankton blooms that support V. vulnificus growth.
• Monitor seawater temperature and salinity, as the bacterium proliferates in warm, low-salinity coastal environments.
• Use electrolyzed water containing hypochlorous acid in aquaculture systems to reduce bacterial contamination while minimizing environmental impact.
• Bacteriophage therapy, such as bacteriophage VVP001, has demonstrated effective reduction of V. vulnificus contamination in seafood and represents a promising biological control strategy.

Public Health Surveillance and Future Prevention Strategies

• Implement routine PCR-based surveillance of seafood, aquaculture products, and coastal waters to detect pathogenic V. vulnificus strains before outbreaks occur.
• Use climate-based forecasting and satellite surveillance to predict seasonal increases in V. vulnificus abundance and support early public health warnings.
• Restrict harvesting of raw oysters during high-risk warm months when bacterial concentrations are highest.
• Provide public education and seafood warning labels for high-risk individuals to reduce severe infections associated with raw oyster consumption.
• Develop vaccines and novel preventive therapies, including multivalent RtxA1/VvhA vaccine candidates, to protect populations at increased risk.

Recent Cases and Epidemiology of Vibrio vulnificus

Recent epidemiological evidence indicates that Vibrio vulnificus infections are increasing worldwide because of rising seawater temperatures, expanding coastal habitats, and improved surveillance. Climate change has extended both the geographic distribution and seasonal activity of this marine pathogen, leading to infections in regions where it was previously uncommon.

Climate-Driven Geographic Expansion

• Global warming has increased coastal water temperatures, creating favorable conditions for the survival and multiplication of V. vulnificus.
• The bacterium is expanding from traditional tropical and subtropical regions into temperate coastal areas of North America and Europe.
• In the eastern United States, the northern limit of reported infections shifted approximately 48 km northward each year between 1988 and 2018.
• By 2018, infections were routinely reported as far north as Philadelphia, whereas they were rarely documented there during the late 1980s.
• Climate models predict continued expansion into New England and potentially throughout much of the eastern United States during this century if warming trends continue.

Recent Global Trends

• Reported V. vulnificus infections continue to increase across North America, Europe, and Asia.The eastern United States experienced an approximately eightfold increase in reported wound infections between 1988 and 2018.
• Maryland reported a 53% increase in V. vulnificus incidence and a 58% increase in hospitalizations between 2006–2012 and 2013–2019.
• Northern Europe experienced an unprecedented increase in vibriosis during the 2018 heatwave, with 445 reported cases, substantially exceeding previous annual totals.
• South Korea continues to report seasonal outbreaks, with infections occurring predominantly during August–October when seawater temperatures are highest.

Regional Epidemiological Highlights

United States

• Coastal states continue to report the highest disease burden.
• Most infections occur during summer and early autumn.
• In 2023, several deaths in New York and Connecticut highlighted the northward expansion of the pathogen.

Europe

• The Baltic Sea and northern European coastlines have experienced increasing outbreaks during exceptionally warm summers.
• Seawater exposure has become a more common transmission route than seafood consumption in several northern countries.

Asia

• South Korea continues to report one of the highest documented case fatality rates, approaching 49% in national surveillance studies.
• China continues to report severe septicemia and necrotizing wound infections with substantial in-hospital mortality.

Emerging Transmission Patterns

• Exposure of open wounds to warm coastal seawater is becoming increasingly common as recreational marine activities increase.
• Consumption of raw oysters and other raw shellfish remains the leading cause of primary septicemia in many countries.
• Rare transmission events associated with insect bites and contaminated frozen seafood have recently been documented.

Public Health Challenges

• Climate change is expected to increase the incidence, geographic range, and duration of V. vulnificus transmission seasons.
• Underreporting remains common because surveillance systems vary considerably among countries.
• Early diagnosis, public awareness, seafood safety measures, and environmental monitoring remain essential to reduce disease burden and mortality.

Region	Recent Epidemiological Findings
Eastern United States	Approximately eightfold increase in reported wound infections (1988–2018), with infections expanding northward by nearly 48 km per year.
Maryland, USA	53% increase in V. vulnificus incidence and 58% increase in hospitalizations between 2006–2012 and 2013–2019.
Northern Europe	Heatwave-associated outbreaks resulted in 445 reported vibriosis cases during 2018, with seawater exposure becoming an increasingly important transmission route.
South Korea	Seasonal outbreaks continue, with nearly 49% case fatality and infections peaking during August–October.
China	Recent studies continue to report severe septicemia and necrotizing wound infections with substantial hospital mortality.
Global Trend	Climate change is expanding the geographic range, increasing seasonal transmission, and raising the global burden of Vibrio vulnificus infections.

Conclusion of Vibrio vulnificus

• Vibrio vulnificus is a highly virulent, halophilic, Gram-negative marine bacterium that causes severe human infections, including primary septicemia, necrotizing wound infections, and gastroenteritis.
• Although infections are relatively uncommon, V. vulnificus has one of the highest case fatality rates among foodborne pathogens, particularly when bloodstream infection develops.
• Individuals with chronic liver disease, diabetes mellitus, iron overload disorders, immunosuppression, alcoholism, and chronic kidney disease are at the greatest risk of developing severe or fatal infection.
• Early diagnosis using culture, polymerase chain reaction (PCR), and metagenomic next-generation sequencing (mNGS) is essential because delayed identification significantly worsens patient outcomes.
• Successful treatment depends on immediate antibiotic therapy, typically a third-generation cephalosporin combined with doxycycline or a fluoroquinolone, together with early surgical debridement for necrotizing soft tissue infections.
• Prevention focuses on avoiding raw or undercooked seafood, protecting open wounds from seawater exposure, practicing safe seafood handling, and increasing awareness among high-risk individuals.
• Climate change is expanding the geographic distribution and seasonal occurrence of V. vulnificus, leading to increasing infections in temperate coastal regions that were previously considered low risk.
• Strengthening public health surveillance, seafood safety regulations, rapid diagnostic capacity, and environmental monitoring will be critical for reducing future disease burden and preventing outbreaks.
• Continued research into novel antimicrobial therapies, rapid molecular diagnostics, vaccine development, and climate-based early warning systems offers promising opportunities to improve the prevention and management of Vibrio vulnificus infections.

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