The present invention relates to a composition for raising an immune response in animal which decreases the risk of chikungunya and smallpox infection, Zika virus and smallpox infection, and/or chikungunya, Zika virus and smallpox infection. The composition comprises a pharmaceutically acceptable carrier and an attenuated poxvirus, wherein the poxvirus genome comprises a nucleic acid sequence encoding the 26S subgenomic polyprotein of chikungunya virus and/or the PrME of Zika virus.
