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Scientists believe babies are born with digestive systems containing few or no bacteria. Their guts then quickly become colonized by microbes — good and…

Future outbreaks of superbugs that resist treatment will test the American health care system's ability to respond. A prominent patient advocate says we need to be ready.

"It's been almost 25 years since Ryan White died of HIV, which he acquired from contaminated blood cells used to treat his hemophilia. Now, hemophilia…

The World Health Organization says the official number of Ebola cases and deaths may "vastly underestimate" the scale of the outbreak. So how bad is it really?

Even just the word Ebola is kind of terrifying. Why? Hollywood has a lot to do with it. But Ebola outbreaks also have all the ingredients for what one psychologist calls the "dread factor."

Two Americans were released Thursday from an Atlanta hospital after treatment for Ebola. The news has generated a flurry of questions about what happens after you survive Ebola. So we asked the CDC.

Older people whose visual acuity has slipped by just one letter on the eye chart are more likely to die sooner, researchers say. New glasses may be all it takes to maintain independence.

At present, no treatment exists for nut allergies, so researchers at the U.S. Department of Agriculture have shifted their focus. Instead of treating people, they're trying to treat the nut.

Hundreds of medicines contain hydrocodone, the addictive painkiller that has grown into the most widely prescribed drug in the U.S.

At this government-run facility in Monrovia, doctors and nurses try to provide care as best they can. But since the Ebola outbreak, many people are afraid to come.