Streptococcus dysgalactiae subsp. dysgalactiae str. SD92. Streptococcus dysgalactiae subsp. dysgalactiae strain:SD92

Streptococcus dysgalactiae (Lancefield group C; GCSD) is a classical etiologic agent of diseases in animals and human beings. It was first associated with fish diseases in 2002, being responsible for outbreaks in amberjack (Seriola dumerili) and yellowtail (Seriola quinqueradiata) farms in Japan. Since 2011, this bacterium has been recognized as an emergent pathogen for Nile tilapia (Oreochromis niloticus) farming in Brazil. The disease in tilapia is characterized by septicaemia and subcutaneous abscess, which causes moderate to high mortalities during outbreaks.

停乳链球菌（Streptococcus dysgalactiae，兰斯菲尔德C群（Lancefield group C），简称GCSD）是引发动物与人类疾病的经典病原微生物。2002年，该菌首次被证实与鱼类病害相关，曾导致日本养殖的高体鰤（Seriola dumerili）和黄尾鰤（Seriola quinqueradiata）养殖场暴发疫情。2011年以来，该菌被认定为巴西尼罗罗非鱼（Oreochromis niloticus）养殖业的新发病原菌。感染该菌的罗非鱼会表现出败血症与皮下脓肿症状，疫情暴发期间可造成中等至高的死亡率。