The invention provides a vaccine composition comprising an antigen component and an adjuvant component, wherein the adjuvant component comprises a P-class immunostimulatory oligonucleotide and either a combination of a saponin and a sterol or an oily phase comprising an oil and, optionally, one or more emulsifiers, said oily phase comprising 2-20% v/v of the vaccine composition, wherein said antigen component is an EHV antigen or a Leishmania antigen.