RT Book, Section A1 Ryan, Kenneth J. SR Print(0) ID 1185630769 T1 Papilloma and Polyoma Viruses T2 Sherris & Ryan's Medical Microbiology, 8e YR 2022 FD 2022 PB McGraw-Hill Education PP New York, NY SN 9781260464283 LK accessmedicine.mhmedical.com/content.aspx?aid=1185630769 RD 2022/05/18 AB Historically, the papillomaviruses and polyomaviruses have been discussed together in microbiology textbooks, lumped under the category of papovaviruses. Papovaviruses are now split into two separate families: Papillomaviridae and Polyomaviridae. The unique characteristics that distinguish them from each other are shown in Table 19–1.