Edwardsiella ictaluri infection in channel catfish, Ictalurus punctatus, altered the expression of genes with similarities to the zebrafish Muc2 and Mucb mucins in the gut [139], and infection with the intestinal parasite Enteromyxum leei decreased the mRNA expression of I-Muc, Muc13, Muc2 and Muc2 like mucin genes in gilthead sea bream [106]. Here, MUC2 is linked to infection.