Heligmosomoides polygyrus infection is associated with lower MHC class II gene expression in Apodemus flavicollis: Indication for immune suppression?

► We associated hepatic immune gene expression in relation to individual parasite burden in wild yellow-necked mice. ► We found a diminished MHC class II expression in animals infected with trichostrongyle nematodes. ► This systemic immunesuppression did not favour bystander infections. ► On the contrary we found negative associations between nematode and cestode infections.