MONDAY, March 18 (HealthDay News) -- Although experts recommend girls and young women be vaccinated against the virus that causes most cases of cervical cancer, parents seem to be increasingly worried about the vaccine's safety, a new U.S. study shows.
Experts say the findings are both worrying and puzzling, because the vaccine -- which guards against the human papillomavirus (HPV) -- has not been linked to any serious side effects.
"It's really concerning that parents think the HPV vaccine isn't safe," said Dr. Dennis Cunningham, an infectious disease specialist at Nationwide Children's Hospital in Columbus, Ohio.
Cunningham, who was not involved in the study, pointed out that about 12,000 U.S. women are diagnosed with cervical cancer each year. And most of those cases are linked to HPV infection.
There are more than 100 strains of HPV, some of which cause genital and anal warts. In most people, the immune system clears the infection fairly rapidly. However, persistent infection with certain HPV strains can eventually lead to cervical cancer in some women.
Because of that, the U.S. Centers for Disease Control and Prevention (CDC) and other groups recommend that all girls ages 11 and 12 receive the HPV vaccine, and that teenagers and young women up to age 26 get "catch-up" vaccination.
The new study, published online March 18 and in the April print issue of Pediatrics, found that between 2008 and 2010, a growing number of U.S. girls were vaccinated against HPV. The percentage of 13- to 17-year-olds who were not up-to-date on the vaccine dipped from 84 percent to 75 percent.
"That's good news," said lead researcher Dr. Paul Darden, a pediatrician at the University of Oklahoma Health Sciences Center in Oklahoma City.
The bad news was that over time, more parents were saying they had no plans to have their daughters vaccinated. And they blamed "s
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