The protein is truncated in this vaccinal strain and presumably inactive, because the lack of signal peptide prevents the protein of being secreted. In the other strains inhibits host immune defense by binding to host chemokines. Binds host CC chemokines (beta chemokines) such as RANTES with high affinity, but not CXC or C chemokines (alpha and gamma chemokines) (By similarity). the wild-type protein is secreted, but this strain encodes a truncated form which lacks the signal peptide. Belongs to the poxviridae chemokine-binding protein family.