We characterized an IL-4/13B homolog (CiIL-4/13B) from grass carp.
CiIL-4/13B mRNA expression responded to Aeromonas hydrophila infection.
rCiIL-4/13B increased fish survival and deceased bacterial load during infection.
Grass carp MO/MФ treated with rCiIL-4/13B underwent alternative activation.