Vibrio vulnificus
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 False-color SEM image of Vibrio vulnificus
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| Vibrio vulnificus (Reichelt et al. 1979) Farmer 1980 |
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Overview
Vibrio vulnificus is a species of Gram-negative, motile, curved, rod-shaped bacteria in the genus Vibrio. Present in marine environments such as estuaries, brackish ponds, or coastal areas, V. vulnificus is closely related to V. cholerae, the causative agent of cholera.[1],[1]
Clinical features
Vibrio vulnificus causes an infection often incurred after eating seafood, especially oysters; the bacteria can also enter the body through open wounds when swimming or wading in infected waters,[1] or via puncture wounds from the spines of fish such as tilapia. Symptoms include vomiting, diarrhea, abdominal pain, and a blistering dermatitis that is sometimes mistaken for pemphigus or pemphigoid. Severe symptoms and even death can occur if the bacterium enters the bloodstream—something more common in people with compromised immune systems or liver disease.[1]
Treatment
Vibrio vulnificus infection has a mortality rate of 50% with the majority of patients dying within the first 48 hours of infection. The optimal treatment is not known, but in one retrospective study of 93 patients in Taiwan, use of a third-generation cephalosporin and a tetracycline (e.g., ceftriaxone and doxycycline) were associated with an improved outcome.[1] Prospective clinical trials are needed to confirm this finding, but in vitro data supports the supposition that this combination is synergistic against Vibrio vulnificus.
Vibrio vulnificus often causes large, disfiguring ulcers which require extensive debridement or even amputation.
Prognosis
The worst prognosis is in those patients who arrive at hospital in a state of shock. Total mortality in treated patients is around 33%.[1]
Those patients who are especially vulnerable, including those with immunocompromised states (cancer, bone marrow suppression, HIV, diabetes, etc}. With these cases, V. vulnificus usually enters the bloodstream, where it may cause fever and chills, septic shock (with sharply decreased blood pressure), and blistering skin lesions.[1] According to the CDC, about half of those who contract blood infections die.
Vibrio vulnificus infections also disproportionately affect males; 85% of those who develop endotoxic shock from the bacteria are male. Females who have had an oophorectomy experienced increased mortality rates, as estrogen is believed to have a protective effect against V. vulnificus.[1]
Historical
Health officials clearly identified strains of V. vulnificus infections among refugees from New Orleans due to the flooding there caused by Hurricane Katrina.[1]
References
External links
da:Vibrio vulnificusja:ビブリオ・バルニフィカス
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
