Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
권호 표지

Immune response of olive flounder, Paralichthys oliveceus against B-hemolytic Streptococcus ineae formalin-killed cells

B-용혈성 Streptococcus ineae 포르말린 사균 백신에 대한 넙치의 면역 반응

  • Published : 2006.04.01
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Abstract

Streptococcal infections were considered as a serious problem because of significant economic losses in fish farm industry. We evaluated the efficacies of Streptococcus iniae vaccines in olive flounder, Paralichthys olivaceus. The vaccines were prepared from 10% neutral buffered formalin to give a final concentration of 0.3% or 3%, respectively. Fish were immunized by intraperitoneal injection of the experimental vaccines once or twice. Neither of the vaccines gave rise to any significant side effects. The antibody titers of booster immunized groups were significantly higher than those of prime immunized groups with both of the vaccines. According to formalin dosage, significantly increased antibody titers were produced by 3% formalin-killed cells (FKC) at 4weeks and 8weeks after prime and booster vaccination, respectively. Although the different levels of antibody production were showed by the vaccinated fish, the good protection obtained in challenge trials of the both vaccines. Fish immunized with 0.3% FKC once or twice had the relative percent survival (RPS) of 66.7% and 87.5%, respectively. Similarly, fish immunized with 3% FKC once or twice had the RPS of 70.0% and 77.0%, respectively. Further experiments are needed to study not only correlation between the antibody titers and RPS against S. iniae but also the side effects of high dose of formalin on antigenicity.

본 연구에서는 넙치에 대한 β-용혈성 Streptococcus iniae 백신의 효능을 조사하였다. 시험 백신은 10% 중성포르말린을 이용하여 최종 농도가 0.3% 및 3%가 되도록 첨가하여 제작하였으며 건강한 넙치의 복강에 1회 또는 2회 주사하였다. 그 결과, 두 종류의 백신 모두 어떠한 심각한 부작용도 야기하지 않았다. 또한 1회 접종구에 비해 2회 접종구에서 응집항체가가 유의적으로 증가하였으며, 포르말린 농도별로 비교한 결과 저농도인 0.3%에 비해 고농도인 3% 포르말린 처리 백신을 접종한 경우 1회 접종구에서는 4주째에, 2회 접종구에서는 8주째 응집항체가가 유의적으로 증가한 것으로 나타났다. 항체 생성에서 나타난 차이에도 불구하고 두 종류의 백신 모두 공격 실험 결과 방어력이 인정되었다. 즉, 0.3% 포르말린 처리 백신의 1회 접종 및 2회 접종구의 경우 각각 67% 및 87.5%의 상대생존율을 나타내었으며, 3% 포르말린 처리 백신의 1회 접종 및 2회 접종구에서는 각각 70% 및 77%의 상대생존율을 나타내었다. 따라서 추후 응집항체가와 방어력 사이의 상관성뿐만 아니라 고농도의 포르말린 처리가 항원성의 변형에 미치는 영향에 대한 연구가 필요할 것으로 사료된다.

Keywords

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