“…Within the genus Morbillivirus of the family Paramyxoviridae, five different viruses have been recognised, which infect members of different mammalian orders under natural conditions: measles virus (MV) of humans, canine distemper virus (CDV) of dogs and other carnivores, rinderpest virus (RPV) and peste des petits ruminants virus (PPRV) of artiodactyls [4,7]. The fifth member of the genus, phocid distemper virus-1 (PDV-1) [21], caused a devastating epizootic among the harbour seals (Phoca vitulina) of North Western Europe in 1988 [18,19], PDV-1 proved to be antigenically and genetically closely related to CDV [13,15,24].…”