A genus of viruses (family Papovaviridae) containing double-stranded circular DNA (MW 5 × 106), having virions about 55 nm in diameter, and including the papilloma and wart viruses of humans and other animals, some of which are associated with induction of carcinoma. More than 70 types are known to infect humans and are differentiated by DNA homology.
Synonym(s): papilloma virus
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