Preparation of live recombinant Lactococcus lactis vaccine expressing Sip protein of Streptococcus agalactiae isolated from tilapia (Oreochromis niloticus) and immunogenicity analysis

• CAI Yuzhen, 
• LIU Zhigang, 
• LU Maixin, 
• KE Xiaoli, 
• GAO Fengying, 
• CAO Jianmeng