Genital human papillomavirus (HPV) is the most common sexually transmitted infection. To date, >40 HPV types have been detected in the anogenital mucosa, and many have been associated with benign or malignant lesions of the genital tract of males and females. These HPV types can also infect the throat and mouth. Very rarely, a pregnant woman with genital HPV can pass HPV to her baby during delivery. In these cases, the child can develop recurrent respiratory papillomatosis.