PUTUCUAL, Venezuela (AP) — Some of the 10 women and teenage girls who recently came to a medical clinic in eastern Venezuela for free contraceptives fidgeted a bit when a community health worker taught them how to use an IUD, condoms and birth control pills correctly.

The health worker also asked what they knew about HPV, the most common sexually transmitted infection in the world and the cause of nearly all cervical cancer. The women, ages 16 to 33 — two of whom had traveled to Putucual by boat and bus — only one had learned about human papillomavirus in middle school. The rest had talked about it with friends or cousins, but never their parents.

None knew HPV vaccines exist, even though Venezuelan pediatricians have long recommended giving all children the vaccine starting at age 9.