More than two-thirds of healthy Americans are infected with human papilloma viruses

69 percent of healthy American adults are infected with one or more of 109 strains of human papillomavirus (HPV). This is the conclusion of a study that is believed to be the largest and most detailed genetic analysis of its kind. Researchers say that while most of the viral strains so far appear to be harmless and can remain dormant for years, their overwhelming presence suggests a delicate balancing act for HPV infection in the body, in which many viral strains keep each other in check, preventing other strains from spreading out of control.

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