Vibrio vulnificus: Difference between revisions
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Vibrio vulnificus
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*Halophilic (salt-loving) marine pleomorphic Gram-negative rod that causes severe rapidly-progressing soft tissue infections |
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==Background== |
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===Pathophysiology=== |
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*Polysaccharide capsule is resistant to phagocytosis and triggers cytokine release including TNF-alpha |
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*It can sequester iron from hemoglobin and highly-saturated transferrin |
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===Epidemiology=== |
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*Mostly found in saltwater estuaries, associated with springtime plankton blooms |
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*Normal microbiotia of molluscs, including oysters and crabs |
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===Risk Factors=== |
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*[[Cirrhosis]] |
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*Other liver disease |
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*Iron-overload states including [[hemochromatosis]], [[hemolytic anemia]], [[chronic renal failure]] |
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*[[Malignancy]] |
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*[[HIV]] |
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*Immunosuppressing medications |
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== Presentation |
==Clinical Presentation== |
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*Presents as [[Causes::gastroenteritis]], skin infection, and [[Causes::bacteremia]] in an immunocompromised patient (usually cirrhosis) |
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*1 to 3 days following ingestion of oysters |
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*Severe, rapidly-progressing soft tissue infection |
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** Erythematous lesions that develop into hemorrhagic bullae then necrotic ulcers |
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**Erythematous lesions that develop into [[Causes::hemorrhagic bullae]] then necrotic ulcers |
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**Metastatic cutaneous lesions develop at 36 hours |
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**Often related to a wound contaminated with salt water, often in the Golf Coast |
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*Bacteremia is common |
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**Associated with oyster consumption in 90% of cases |
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*25% case-fatality rate, up to 50% in cases of bacteremia |
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==Management== |
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*Needs antibiotics, ideally early, as well as surgical debridement of the nectrotizing soft tissue infection |
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*[[Fluoroquinolones]], third-generation [[cephalosporins]], and [[doxycycline]] all work |
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*Should typically start with combination of third-generation [[Cephalosporins|cephalosporin]] and either [[ciprofloxacin]] or [[doxycycline]] |
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==Prevention== |
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*Patients with cirrhosis should avoid eating raw oysters |
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{{DISPLAYTITLE:''Vibrio |
{{DISPLAYTITLE:''Vibrio vulnificus''}} |
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[[Category:Gram-negative bacilli]] |
[[Category:Gram-negative bacilli]] |
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Latest revision as of 16:13, 27 September 2022
- Halophilic (salt-loving) marine pleomorphic Gram-negative rod that causes severe rapidly-progressing soft tissue infections
Background
Pathophysiology
- Polysaccharide capsule is resistant to phagocytosis and triggers cytokine release including TNF-alpha
- It can sequester iron from hemoglobin and highly-saturated transferrin
Epidemiology
- Mostly found in saltwater estuaries, associated with springtime plankton blooms
- Normal microbiotia of molluscs, including oysters and crabs
Risk Factors
- Cirrhosis
- Other liver disease
- Iron-overload states including hemochromatosis, hemolytic anemia, chronic renal failure
- Malignancy
- HIV
- Immunosuppressing medications
Clinical Presentation
- Presents as gastroenteritis, skin infection, and bacteremia in an immunocompromised patient (usually cirrhosis)
- 1 to 3 days following ingestion of oysters
- Severe, rapidly-progressing soft tissue infection
- Erythematous lesions that develop into hemorrhagic bullae then necrotic ulcers
- Metastatic cutaneous lesions develop at 36 hours
- Often related to a wound contaminated with salt water, often in the Golf Coast
- Bacteremia is common
- Associated with oyster consumption in 90% of cases
- 25% case-fatality rate, up to 50% in cases of bacteremia
Management
- Needs antibiotics, ideally early, as well as surgical debridement of the nectrotizing soft tissue infection
- Fluoroquinolones, third-generation cephalosporins, and doxycycline all work
- Should typically start with combination of third-generation cephalosporin and either ciprofloxacin or doxycycline
Prevention
- Patients with cirrhosis should avoid eating raw oysters
