In answer to the headline, quite a few. In fact, the number might be higher than you think.
The answer: Almost 50% of U.S. adults have human papillomavirus (HPV).
In case you’re blissfully unaware, HPV is “the most common sexually transmitted infection (STI).” The virus is most commonly transmitted during vaginal and anal sex. In worst cases, HPV can morph into genital warts and cause cancer.
A report published by the National Center for Health Statistics revealed that 42%+ of U.S. adults ages 18-59 had genital HPV. Certain strains of the virus affected 25%+ of adult men and 20%+ of adult women. These strains caused 31K cases of cancer per year.
The report also found that 7%+ of U.S. adults had oral HPV, and 4% had HPV strains associated with mouth and throat cancers.
Rates of HPV broke down along demographic lines:
The highest rate, 33.7 percent, was found among non-Hispanic blacks; the lowest, 11.9 percent, among Asians. The prevalence of genital HPV infection was 21.6 percent among whites and 21.7 percent among Hispanics.
The study was the first of its kind to examine HPV in adults.
This study really drives home the need for HPV vaccination. Yet despite a push for getting adolescents vaccinated, the HPV vaccination rate remains stubbornly low: “Only 30-40% of teens who should be getting immunized receive the three-dose shot, and only 10% of men do.”