Koala retrovirus status and putative koala retrovirus-associated diseases in koalas (Phascolarctos cinereus) in North American zoos. In Proceedings of the Second Koala Retrovirus Workshop, ed. D. E. Alquezar-Planas, D. P. Higgins, C. L. Singleton, and A. D. Greenwood

The living koala population in North America is predominantly descended from koalas imported a single Australian facility 1976 and 1981, with several smaller imports other facilities between 1985 2013. Koala retrovirus subtype B (KoRV-B) entered the American via 2005, 2008, 2005 2008 KoRV-B positive lineages are deceased, but 2013 lineage has seven surviving koalas, including one female of breeding age. Three born to negative dams were documented as being at 15 months age after nursing female. prevalence A (KoRV-A) detection 100% 17%. Lymphoid neoplasia common cause mortality, dating back founder koalas. Most cases lymphoid have occurred presumptive many ages four nine years. Familial clusters apparent. Additionally, myelodysplasia fatal peripheral cytopenias important putative KoRV-associated diseases that mortality America, higher younger than two years Since 2013, known been managed, maintain separation remainder population.