Marek’s disease virus(MDV) infection in chickens can cause peripheral nerve,gonads, irises,various internal organs tumors and immunosuppression.VP22,a specific component of the envelope protein of α-herpesvirus, has a unique ability to transport proteins related to virus replication and nucleic acids into cells.Moreover,it can inhibit the cGAS-STING signal pathway to help the virus escape from the host's natural immune barrier. However, whether VP22 is related to the immune escape of MDV has not been reported.In this review,we focus on the nu...