Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Bacteriological Study of Listeria sp. Isolated from Seawater and Sea Food

해수와 해산물로부터 Listeria 속의 분리와 세균학적 조사

  • Published : 2003.08.01
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Abstract

Four species of the genus of Listeria were isolated from seawater and sea food in Kyungnam province, South Korea. These isolated strains were classified into Listeria sp. from different samples by appropriate cultivation conditions and biochemical tests including serological test. In a day enrichment cultivation, the following strains were found out of 100 samples: L. innocua (35%), L. ivanovii (4%), L. monocytogenes (4%), and L. welshimeri (1%). For seven days enrichment culture, L. innocua (38%), L. ivanoii (5%), L. monocytogenes (7%), and L. welshimeri (1%) were isolated. From these results, Listeria species were more efficiently isolated in seven day enrichment broth than in one day enrichment. However, these isolated Listeria species were less grown in the selective medium than in the enrichment medium. Isolation rates of Listeria species showed differency for each sample and Listeria species were more abundantly isolated in shrimps (80%) and crayfishes (80%) than little neck clams (50%), seawater (25%) and mussels (20%). From the results of serological classes for the seven L. monocytogenes, two strains were defined as type I and the other five strains as type IV.

본 연구는 경남지역의 해수와 해산물에서 Listeria 속을 분리하여 증균배양방법에 따른 균의 분리율, 선택배지에 따른 균의 분리율, 검체에 따른 균종 별 분리율, 생화학 시험과 분리된 L. monocytogenes에 대하여는 혈청형 시험을 실시하였다. 총 100건의 검체에서 증균배양에 따른 Listeria 속의 분리율은 1일 증균배양에서 L. monocytogenes가 4% (4건), L. innocua가 35%(35건), L. ivanovii가 4%(4건), L. welshimeri가 1%(1건)였고, 7일간 증균배양에서는 L. monocytogenes가 1%(7건), L. innocua가 38%(38건), L. ivanovii가 5%(5건), L. welshimeri가 1%(1건)로 동정되어 1일 증균배양 보다 7일간의 증균배양이 Listeria속의 분리에 휠씬 효과적이었다. 이와 함께 Oxford 선택배지나 LPM 선택 배지를 사용하였을 경우 증균배양과 비교하여 검출율이 조금 낮았다. 검체에 따른 Listeria 속의 분리율은 새우와 가재에서 80%(16/20)로 분리율이 가장 높았으며, 바지락에서 50% (10/20), 해수에서 25%(5/20), 홍합에서 20%(4/20)의 순으로 나타났다. 그리고 Listeria 속의 균종 별 분리율은 L. irnnocua가 38%(38건), L. monocytogenes가 7%(7건), L. ivanovii가 5%(5건), L. welshimeri가 1%(1건)순으로 분리되었다. 각 검체에서 Listeria 속의 균종 별 분리율은 새우에서 L. innocua가 65%(13건), L. monocytogenes가 15%(3건), 가재에서 L. innocua가 70%(14건), L. monocytogenes가 10%(2건), 바지락에서 L. innocua가 45%(9건), L. monocytogenes가 5%(1건), 홍합에서 L. innocua가 10%(2건), L. monocytogenes가 5%(1건), L. welshimeri가 5%(1건), 해수에서 L. ivanovii가 25%(5건)분리되었다. L. monocytogenes로 분리 동정된 7주에 대한 혈청형 분류는 type I이 2주, type IV가 5주로 나타났다.

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