For almost a decade, researchers have studied why a vaccine for adolescents that could prevent tens of thousands of cancers every year is so unpopular.
Turns out it's not so much the cost, or safety worries, or the antivaccine movement.
The biggest obstacle, studies show, is that doctors aren't recommending the HPV vaccine because they're uncomfortable talking to parents and tweens about a virus spread by S-E-X.
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