Vaccinestammerne vCP2242 og vCP1533 er rekombinante canarypox virus der afgiver hæmagglutinin HA genet fra hhv. influenza virusstammerne A/ equi- 2/ Ohio/ 03 (amerikansk stamme) og A/ equi - 2/ Newmarket/ 2/ 93 (europæisk stamme) hos hest.
3/ 17 The vaccine strains vCP2242 and vCP1533 are recombinant canarypox viruses expressing the haemagglutinin HA gene from the equine influenza virus strains A/ equi-2/ Ohio/ 03 (American strain) and A/ equi-2/ Newmarket/ 2/ 93 (European strain), respectively.