Ecology of Vibrio cholerae non-O1 and Vibrio mimicus in Estuary of Kum River, Korea

금강 하구의 Vibrio cholerae non-O1과 Vibrio mimicus의 선택

To study ecological properties of Vibrio cholerae non-Ol and Vibrio mimicus which have been described as new food poisoning bacteria recently, the influence of factors such as temperature, salinity, pH and chemical oxygen demand (COD) on detection rate and density of these bacteria were evaluated. Fifty four seawater samples and 49 bottom deposit samples from estuary of Kum river from March 26th, 1993 to February 22nd, 1994 were used for this study. The detection rate of V cholerae non-O1 were $16.7\%$ for seawater and $10.2\%$ for bottom deposit, respertively. The total detertion rate of V. cholerae non-O1 $(11.7\%)$ was a little higher than V mimicus $(10.7\%)$. Both V choierae non-O1 and V. mimicus were mainly detected in estuary water of which showed temperature $24^{\circ}C$ above and salinity $10\%o$ below. These bacteria were also detected in bottom deposit on January when the water temperature was $3.5^{\circ}C$. From these results, we supposed that temperature, salinity and organic material were important factors to growth of V. cholerae non-O1 and V. mimicus. V cholerae non-O1 might be grown better than V. mimicus under the fluctuating aquatic environmental condition such as salinity.

새로운 식중독 원인균으로 알려지고 있는 V cholerae non-O1과 V mimicus의 분포와 서식 조건을 밝히고자 금강 하구에서 1993년 3월 26일부터 1994년 2월 22일까지 수질 환경과 V cholerae non-O1 및 V mimicus의 분포를 조사한 결과는 다음과 같다. 1. V cholerae non-O1은 해수 54개 시료에서 $16.7\%$, 뻘 49개 시료에서 $6.1\%$, 전체 $11.7\%$가 검출되었으며 V mimicus는 해수 54개 시료에서 $11.1\%$, 뻘 49개 시료에서 $10.2\%$, 전체 $10.7\%$가 검출되었다. 2. V cholerae non-O1과 V. mimicus는 수온 $24^{\circ}C$이상, 염도 $10\%o$ 이하의 기수에서 주로 검출되었으나, 수온이 $3.5^{\circ}C$인 1월에 뻘에서 검출되었다. 3. V cholerae non-O1과 V. mimicus의 서식에 영향을 주는 주요 인자는 온도, 염도 및 유기물질의 오염이며, V. cholerae non-O1은 V. mimicus보다 염도 변화에 대한 적응력이 더 높았다.