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<p><em>Retroviruses are viruses that multiply by incorporating their genes into the genome of a host cell. If the infected cell is a germ cell, the retrovirus can then be passed on to the next generation as an &ldquo;endogenous&rdquo; retrovirus (ERV) and spread as part of the host genome in that host species. In vertebrates, ERVs are ubiquitous and sometimes make up 10 per cent of the host genome. However, most retrovirus integrations are very old, already degraded and therefore inactive &ndash; their initial impact on host health has been minimised by millions of years of evolution. A research team led by the Leibniz Institute for Zoo and Wildlife Research (Leibniz-IZW) has now discovered a recent case of retrovirus colonisation in a rodent from New Guinea, the white-bellied mosaic-tailed rat. In a paper in the scientific journal &quot;Proceedings of the National Academy of Sciences&quot;, they describe this new model of virus integration. The observat

Papua new guineaKenp aplinMax delbrAlex greenwoodSaba mottaghiniaCalifornia state university fullertonUniversity of nicosiaAustralian museumRobert koch instituteProceedings of the national academy sciencesDepartment of wildlife diseasesLeibniz institute for zooGreenwood departmentMuseum victoriaMethod of researchGerman research foundation