Efikasi Vaksinasi pada Benih Ikan Nila (Oreochromis niloticus) dengan Metode Infiltrasi Hiperosmotik untuk Mencegah Infeksi Streptococcus agalactiae (THE EFFICACY OF VACCINATION ON TILAPIA SEEDS OF (Oreochromis niloticus) USING HYPEROSMOTIC INFILTRATION - Firdausi, Amalia Putri (Faculty of Veterinary Medicine, Udayana University and Published in collaboration with the Indonesia Veterinarian Association, 2018)