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Channel catfish were vaccinated with PBS + ISA763, iS + ISA763, rSrr + ISA763, rNeuA + ISA763 or rHsp + ISA763. Sera were collected from the fish at 1 ~ 8 weeks p.v. Data are presented as means ± SD (n = 5). Different letters indicate significant differences among groups at the same time (p < 0.05).
