Morphological Characteristics and Pathogenicity of Streptococcus iniae

Streptococcus iniae의 형태학적 특성과 병원성

  • Kim, Hyun-Jeong (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Woo, Sung-Ho (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kim, Jin-Woo (Pathology Division, NFRDI) ;
  • Park, Soo-Il (Department of Aquatic Life Medicine, Pukyong National University)
  • 김현정 (부경대학교 수산생명의학과) ;
  • 우승호 (부경대학교 수산생명의학과) ;
  • 김진우 (국립수산과학원 병리연구팀) ;
  • 박수일 (부경대학교 수산생명의학과)
  • Published : 20050800


Streptococcus iniae is one of the major bacterial pathogens of cultured olive flounder, Paralichthys olivaceus in Korea. This study was carried out to investigate the interaction between morphological characteristics and immune response such as phagocytosis and serum killing activity. They were differentiated phenotypically into two groups, the viscous colonies and the non-viscous colonies, but the strains in both groups were similar in physiological and biochemical characteristics. Electron microscopic examination of the viscous form revealed thick, electron-dense exopolysaccharide materials surrounding polycationic ferritin-stained cells, while the exopolysaccharide material was absent around the non-viscous form of S. iniae. The viscous type strains were disclosed more virulent than those of non-viscous type for olive flounder. The viscous strains were resistant to normal serum killing activity, while the non-viscous strains were susceptible to bactericidal activity of normal serum from olive flounder. The viscous strains were more resistant to opsonophagocytosis and decreased the chemiluminescence response of head kidney macrophages of olive flounder. All of the tested non-viscous S. iniae strains were efficiently destroyed by the macrophage after phagocytosis. Both the viscous and the non-viscous strains invaded and replicated in cultured fish cell line (CHSE-2l4). This cellular invasion may contribute to the pathogenesis of invasive S. iniae infection.


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