Federal health officials upended the immunization schedule for American children this week. These are the diseases affected.

Here’s what to know about the dominant version of the virus that’s circulating now.

Rates of the disease have fallen since 1991, when all newborns began receiving the shot. President Trump recently said he thought children should not get it until age 12.

President Trump said on Monday that Tylenol use during pregnancy could lead to autism, a claim that is unproven.

Five years on, scientists are starting to understand how the virus can lead to long-term, sometimes invisible changes.

Federal officials will soon begin testing the country’s milk supply for the virus. Here’s what to know.

Scientists are still studying the long-term health effects of smoke exposure.