Fig. 4.

Cumulative mortality of channel catfish following infection by Edwardsiella ictaluri strains carrying mutations in T3SS regulatory gene esrA (A), esrB (B), or esrC (C). Strains carrying complementation plasmids are labeled with pesrA, pesrB, or pesrC. Bars indicate the mean daily cumulative percent mortality (± SEM) in triplicate challenge tanks. Mortality curves with the same letter show no significant difference in cumulative percent mortality (P > 0.05), based on analysis of arcsine-transformed data.