arteriviridae arteriviridae arteriviridae is a family of enveloped, positive-strand rna viruses in the order nidovirales which infect vertebrates. host organisms include equids, pigs, possums, nonhuman primates, and rodents. the family includes, for example, equine arteritis virus in horses which causes mild-to-severe respiratory disease and reproductive failure, porcine reproductive and respiratory syndrome virus type 1 and type 2 in pigs which causes a similar disease, simian hemorrhagic fever virus which causes a highly lethal fever, lactate dehydrogenase–elevating virus which affects mice, and wobbly possum disease virus. arteriviridae arterivirus virion equine artevirus genome virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: pisoniviricetes order: nidovirales suborder: arnidovirineae family: arteriviridae structure member viruses are enveloped, spherical, and 45–60 nm in diameter. genome arteriviruses have a positive-sense single-stranded rna genome. taxonomy phylogenetic tree of arteriviruses the family arteriviridae contains the subfamilies: crocarterivirinae equarterivirinae heroarterivirinae simarterivirinae variarterivirinae zealarterivirinae