Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

No Link Between HPV Vaccine, Promiscuity for Girls: Study

A new survey appears to discount the notion that receiving a vaccine against the human papillomavirus (HPV) will raise rates of promiscuity among girls aged 15 to 19.

The vaccine is meant to counter strains of sexually transmitted HPV that are thought to be responsible for most cases of cervical cancer. But some have worried that the shot might encourage young girls to become sexually active.

The new survey, published in the January issue of The American Journal of Preventive Medicine, found no such link, The New York Times reported. The study also found that sexually active girls who'd received the shot were also more likely to consistently use condoms compared to unvaccinated sexually active girls.

"This is all preliminary data, but it shows no association between HPV vaccination and sexual risk," lead author Nicole C. Liddon of the U.S. Centers for Disease Control and Prevention told the Times. "So it should to some degree assuage any concerns that HPV vaccination would lead to increased sexual activity," she said.

According to the report, by the end of 2008, 30 percent of females ages 15 to 19, and 16 percent of females ages 20 to 24 had gotten at least one dose of the HPV vaccine.

2nd Study Linking Retrovirus to Chronic Fatigue Syndrome Is Retracted

Yet another study linking retroviral infections to chronic fatigue syndrome has been called into question, with the findings of a 2010 study retracted on Monday.

Last week, a study published in Science a year earlier was retracted by the editors of that journal. That research found a possible association between the illness and a mouse leukemia retrovirus known as XMRV. This second study, published in the Proceedings of the National Academy of Sciences, was withdrawn by its authors, according to The New York Times.

Although the 2010 study had confirmed the findings of the 2009 research, other scientists had been unable to arrive at the same conclusion. Some had said that laboratory materials were contaminated during the course of their work.

Respected researchers from the U.S. Food and Drug Administration, the U.S. National Institutes of Health (NIH) and Harvard Medical School were all involved in the 2010 study. Randy Schekman, former editor-in-chief of PNAS, told the Times that the journal had been "encouraging" the authors to reconsider their findings in light of subsequent research.

In the retraction, the authors wrote, "It is our current view that the association of murine gamma retroviruses with [chronic fatigue syndrome] has not withstood the test of time or of independent verification and that this association is now tenuous."

Meanwhile, results expected in March from a large-scale NIH study should help decide definitively whether chronic fatigue syndrome is related to these retroviruses, the Times reported.