Robert F. Kennedy Jr.’s first 100 days as secretary of Health and Human Services has ushered in a period of ambitious reform, ...

A combination of an uptake in measles vaccinations and a buildup of natural immunity is likely behind a decline of new measles cases in the U.S., experts say.

One of the grand joys of being old is dealing with what we’ll call the eccentricities of Medicare. Most prominent, of course, ...