Expression of trxC and trxA in wild type Edwardsiella piscicida TX01 strain and TX01∆trxH strain. Total RNA was extracted from E. piscicida TX01 and TX01∆trxH cultured in normal LB medium (control, pH = 7), in hydrogen peroxide condition (with H2O2), in acid condition (pH = 5), or incubating with FG cells, respectively. Expressions of trxC and trxA were analyzed by RT-qPCR. Data are presented as mean ± SEM (N = 3). N, the number of times the experiment was performed. **P < 0.01.