PCR amplification of 18S rDNA and COI genes of EMC detected in examined tilapia and mullet fish samples. A, PCR results for 18S rDNA gene. B, PCR results for COI gene. Lanes 1-10: tilapia fish samples. Lanes 11-32: Mullet fish samples. M: 100 bp DNA marker. P, Control positive; N, Control negative.