Rat Papillomavirus Infection
Papilloma viruses have not been associated with lesions in rats, but 2 papillomaviruses, rat papilloma virus-1 (RnPV1) and rat papillomavirus-2 (RnPV-2) have been amplified and sequenced from the oral cavity, rectal mucosa, and facial hairs of wild Norway rats in Europe.
RnPV-1 belongs to the Pipa-papillomavirus genus, and RnPv-2 belongs to the Iota-papillomavirus genus. The existence of these 2 distantly related papillomaviruses in subclinically infected wild rats suggests that such infections may be widespread among rats, and it remains to be determined if laboratory rats carry papillomaviruses. The recent observation of an outbreak of viral papillomas among laboratory athymic nude mice due to an unrelated mouse papillomavirus (see Mouse Chapter 1, “Papillomavirus infections”) underscores the concept that not all viral infections of laboratory rodents have been discovered and the growing use of immunodeficient rodents may contribute to future discoveries.
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