Having been vaccinated with 1/10 LD50 A. veronii (pN-PA-1) for 14 days, the challenge was conducted with 100 LD50 A. veronii C4 in the total amount of 4.98 × 107 CFU/g. Mortality was examined, and dead zebrafish were removed in subsequent 7 days. The relative percent survival (RPS) was determined according to the following formula. RPS=[1-(% mortality of immunized fish/% mortality of control fish)]× 100 (Byon et al., 2005).
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