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69 percent of healthy American adults are infected with 109 strains of human papillomavirus In what is believed to be the largest and most detailed genetic analysis of its kind, experts at NYU Langone INFIRMARY and elsewhere have concluded that 69 % of healthy American adults are infected with one or more of 109 strains of human papillomavirus . Only four of the 103 women and men whose cells DNA was publicly obtainable through a government data source had either of both HPV types known to cause most instances of cervical malignancy, some throat cancers, and genital warts http://aygestin.org/side-effects-of-aygestin.html . Experts say that while most of the viral strains up to now seem to be harmless and can remain dormant for a long time, their overwhelming presence suggests a delicate balancing action for HPV disease in the physical body, where many viral strains keep each other in balance, preventing various other strains from spreading uncontrollable.