A key step in the origin of many pandemics occurs when an animal-borne virus infects humans and then evolves to spread more efficiently from person to person. That is why scientists and physicians ...

Roughly 40 million people are estimated to wear a fitness tracker of some kind. Now one of those brands, Fitbit, has teamed up with researchers to try and predict COVID-19 symptoms before they start. ...

A preliminary study of 52,330 Israeli women found similar rates of heart attack, stroke, blood clots and early death among hormone therapy users and nonusers, though it cannot prove safety. Older ...