Fig. 1. Daily mean percent cumulative mortality of channel catfish intraperitoneally vaccinated with or without the novobiocin and rifampicin resistant mutants of Aeromonas hydrophila and challenged with their respective virulent parent isolates of A. hydrophila through intraperitoneal injection at 14 days post vaccination. Daily mean percent cumulative mortalities were calculated from vaccine trials at four vaccination doses (4.0×105, 2.0×105, 1.0×105, and 5.0×104). Data are presented
as mean±S.D. from the four trials.