Expression profiles of NODs in channel catfish (Ictalurus punctatus) after infection with Edwardsiella tarda, Aeromonas hydrophila, Streptococcus iniae and channel catfish hemorrhage reovirus

► Channel catfish NODs gene expression showed tissue-specific and pathogen-specific. ► NODs gene expression was changed stronger by bacteria than by virus in immune tissues. ► The order for NODs up-regulation was liver, head kidney, intestine, and spleen post pathogens challenge.