About 1 out of every 100 sexually active adults in the United States have genital warts at any one time. Most of these cases are caused by HPV-6 or HPV-11.
Recurrent respiratory papillomatosis (RRP) causes warts to grow in the breathing tubes (trachea and bronchi) and lungs. It’s very rare, but can happen when a pregnant woman with genital HPV passes HPV to her baby during delivery. RRP occurs in less than 2,000 infants and children in the US every year. It may lead to breathing problems, a hoarse voice, or may rarely progress to cancer of the larynx. It is most often linked with HPV types 6 and 11.
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