Isolation, virulence and antigen determination of Streptococcus agalactiae strains caused disease in Tilapia at 7 provinces of Viet Nam

Abstract

The result of isolation, virulence and antigen determination of Streptococcus agalactiae strains caused the disease in Tilapia at Ha Noi, Hai Duong, Quang Ninh, Dong Thap, Tien Giang, Vinh Long, An Giang showed that there were 96% of samples infected with Streptococcus agalactiae. The isolated Streptococcus strains presenting antigen, belonged to NS5, NS13, LX7, LX8, LX9, LX10, DN8, DN9, DN10, DN12, DN17, O2, TP3, TP4. The virulence of Streptococcus agalactiae strains belonging to serotype (TP4, O2, DN12, LX8 and NS5) was very strong.