Michaeleen Doucleff

Bats, birds and tourists love a good cave. And so do viruses. Scientists say this mixture could trigger a deadly outbreak.

If you think there are more dangerous infectious diseases than ever, you're right. One big reason: pushing animals like this one out of their homes.

Over the past 60 years, the number of new diseases cropping up in a decade has almost quadrupled. "We're in a hyperinfectious world," says one scientist.

One big part of the puzzle: Why have there been so many microcephaly cases in the northeastern tip of Brazil?

Scientists announced Thursday that they created a safe, effective vaccine to prevent Ebola. They don't know yet how long the protection will last, but it will bring outbreaks to a screeching halt.

The results are in from the clinical trials of a new vaccine — and it looks like a potent weapon. In fact, they are already stockpiling it.

Scientists were shocked to see what happened when this ancient bacterium encountered modern antibiotics.

Next time you get a Brazilian wax or do a little manscaping, you may be getting more than you bargained for. Banishing hair downstairs may increase the risk of sexually transmitted infections.

But it's too early to say whether the epidemic isn't has bad as the agency first predicted back in February.

"This is an avoidable disaster," says one expert. And there are at least three things you can do to help.

Leprosy has been long gone from Great Britain. Or so we thought.

Two studies show that Ebola virus mutated early in the West Africa outbreak, becoming much more infectious and thus able to kill more people.

A Canadian flight attendant had been blamed by media for years for bringing HIV to the U.S. A new study proves that's impossible. The virus that took hold came from Haiti in the early 1970s.

Zombie bacteria in defrosting reindeer carcasses brought anthrax back to Siberia. Now the government wants to slaughter 250,000 reindeer to stop the spread.

U.S. health officials are advising pregnant women to postpone travel to parts of Southeast Asia because of the risk of catching Zika. Recent outbreaks have occurred in Singapore and Thailand.

Drug resistance is no longer a matter of health. It could have massive implications for the world's economy and food supply.

People talk a lot about the warming of the Earth by a few degrees. Now a cartoon shows you what it looks like.

Poisoning these thirsty critters doesn't work. But researchers think they're finally getting close to figuring out a plan.

Southeast Asia has all the right ingredients for a massive outbreak. But it also has a hidden advantage that could keep the virus from spreading.

It's best known as a hallucinogenic club drug here in the U.S., but in many countries, ketamine has a more noble role.