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Introduction UNAIDS estimates that globally 36.7 million people, including 2.1 million children, were living with human immunodeficiency virus (HIV) infection in 2016. The number of people who acquired HIV infection in 2016 was 1.8 million. Since the start of the…

Viral Infections Common wart The common wart (verruca vulgaris) is caused by infection with human papillomavirus (HPV) ( Fig. 18.1 ). HPV is a DNA virus of the papovavirus family. The number of known HPV genotypes currently stands at more…