Then-President Donald Trump tested positive for Covid-19 three days ahead of his first 2020 presidential debate with Joe Biden -- though he also had a negative result in that same timeframe, according to excerpts from a forthcoming book from the former...

Mumps cases continue to circulate in the U.S., largely among vaccinated people, including children.

As with COVID-19, Black Americans face increased risks from cardiovascular disease. More can be done to help.

Up to 130 lives could be saved a year in New York City with the help of OPCs, according to officials

The U.S. ratcheted up threats to retaliate as it accused Russia of intensifying preparations for a possible invasion of Ukraine, in the latest signs that tensions over Moscow’s military buildup on the border continue to spiral.