Also spelled papilloma virus any of a group of viruses belonging to the family Papillomaviridae that infect birds and mammals, causing warts (papillomas) and other benign tumours in humans. They are small polygonal viruses containing circular double-stranded DNA, and more than 55 distinct types of human papillomaviruses (HPVs) are now known on the basis of analysis of their DNA. Skin warts are of
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