characteristic yellow colonies, which were the only type of organism identified. Cultures were negative for Salmonella, Shigella, Campylobacter, and Escherichia coli O157:H7.Antimicrobial susceptibility testing for the isolate revealed susceptibility to aminoglycosides, fluoroquinolones, trimethoprimsulfamethoxazole, and tetracycline and resistance only to ampicillin. The patient was treated with a single 1-g oral dose of ciprofloxacin and subsequently reported complete resolution of his diarrhea.V. alginolyticus has only rarely been associated with acute diarrheal illness [2][3][4][5][6][7][8]. In the seven studies, a total of 15 cases of diarrhea due to V. alginolyticus were reported from 1980 to 1995. In four of these 15 cases, another enteric pathogen along with V. alginolyticus, including Campylobacter, Shigella, E. coli, and Vibrio parahaemolyticus, was isolated, suggesting that V. alginolyticus may not have even been the causal agent in these cases [5][6][7]. In an additional eight cases, it was not specified whether V. alginolyticus was the sole organism recovered [3, 4]. Only three prior cases clearly demonstrate pure isolation of V. alginolyticus from a patient with acute diarrhea [2,6,8]. Chronic diarrhea was not described in any of the 15 cases. A MEDLINE search of the English-language literature from 1966 to 1999 revealed no reports of chronic diarrhea associated with V. alginolyticus.Our case is also of interest because it involved a homosexual man who was immunocompromised secondary to AIDS. This situation raises the question of whether patients with AIDS or homosexual males are at increased risk of developing V. alginolyticus infections. An AIDSLINE search of the English-language literature from 1980 to 1999 revealed no other case reports of such infections. There have, however, been several case reports of gastroenteritis caused by other Vibrio species in patients with AIDS. One report described acute diarrhea caused by Vibrio fluvialis in a man with AIDS [9], and another discussed a case of sepsis, peritonitis, and gastroenteritis in a homosexual man with AIDS that was found to be caused by Vibrio vulnificus [10]. In both of these cases, the patients had eaten seafood (scallops and raw oysters, respectively) prior to symptom onset, suggesting that the infections were food-borne.In conclusion, we report what we believe to be the first case of chronic diarrhea associated with V. alginolyticus, thereby suggesting that this organism may be a cause of chronic diarrhea in immunocompromised hosts.
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