3.3. Detection of E. ictaluri virulence genes
PCR amplification results for six virulence genes revealed that all 26
isolates were esrC +,evpC +, and ureA-C +(Figure 3, Table 4). However, all isolates were PCR-negative for the
three remaining genes (eseI -,escD -, and virD4- )
(Table 4).