What stands between a flu that mostly affects pigs and a deadly virus that can jump from human to human? According to a new study, the barrier is only a few genetic tweaks.

More and more research is finding how viruses and other diseases are connected with some cancers. Many of these conditions are caused by sexually transmitted infections ( STI ). One cancer has a new STI link.

File this under things that just make sense: Providing HIV testing to people in drug abuse treatment programs. But currently, less than half of community-based programs make it available.

The human papillomavirus (HPV) is linked to a number of cancers. And the Epstein Barr virus is associated with nasal cancer. It turns out these two viruses may have a mysterious association with yet another.

Who is getting the message about getting the flu shot every year? A new study finds that in some cases, a racial line can be drawn between who gets vaccinated and who doesn't.

Getting a runner's high is the ultimate goal for marathon runners. But these runners can get a bit more than they asked for if they're not too careful.

This year has seen what experts are calling one of the worst ever outbreaks of disease from the West Nile virus. The mosquito-borne disease shows no sign of slowing down through its peak season.

Should an HIV prevention pill be prescribed only to those who are at the highest risk? That's the question that doctors grapple with after the FDA approved Truvada as a preventative drug.

To use a condom or to not use a condom? For gay couples, the answer was different among different races.

For more than a decade, HIV patients relied on a heavy “cocktail” of pills to keep the virus at bay. Now, there's the option of taking only one daily pill that combines four drugs.