Expressions of capsular polysaccharide synthetic gene of Streptococcus agalactiae isolated from Nile tilapia(Oreochromis niloticus) and their effects on capsular sialic acid content and bacterial pathogenicity

• SHI Hongya, 
• DONG Junjian, 
• ZHANG Defeng, 
• SUN Chengfei, 
• TIAN Yuanyuan, 
• LU Maixin, 
• YE Xing