Eileen Fox's Battle: How an STI Turned Her World Upside Down

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Nearly every case of cervical cancer — a whopping 99.7% — is caused by human papillomavirus (HPV), a sexually transmitted infection (STI). HPV has also been linked to more than 90% of anal cancers and about 69% of vulvar cancers.

And Eileen McGill Fox is battling all three.