Ecology of Non-O 1Vibrio choleraein Toyama Prefecture

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Abstract
The ecology of non-O 1 V. cholerae and V. mimicus as causes of cholera-like diarrhea or seafood-associated gastroenteritis has been investigated in Toyama Prefecture since 1980. The relationship between biological or serological characteristics of the isolates and their enteropathogenicity was studied. Overall isolation rates from river water, sea water and fish were 24.0, 59.5 and 33.7%, respectively, the isolation frequency being, in general, extremely high in the summer season; the organisms were detected throughout the year in sea water. Most isolates from river water were unable to grow on plates of TCBS agar to which colistin was added at a concentration of 1 .mu.g/ml (CL-TCBS). These strains quickly fermented cellobiose. O-51 and O-70 were the 2 most frequently detected serogroups among them ; they did not show enteropathogenicity in the rabbit ileal loop (RIL) test. Almost all isolates from sea water, fish and human diarrhea cases grew on CL-TCBS, but were unable to ferment cellobiose quickly. O-36, O-10, O-6, O-8, 0-39 and O-26 were the dominant serogroups of these isolates; some of them showed enteropathogenicity in the RIL test. Of 98 isolates from river water, 116 from sea water and 112 from fish 6,14 and 19, respectively, were classified as V. mimicus. All of these strains grew on CL-TCBS and quickly fermented mannose but not cellobiose. O-41 was the most common serogroup among them; some of these strains showed enteropathogenicity in the RIL test. Production of a cholera-like enterotoxin among the isolates in Toyama Prefecture, if any, seemed to be poor.

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