Follow Exercise Guidelines and You'll Live Longer, Study Says
HIV May Not Worsen COVID-19 Outlook
U.S. Coronavirus Hospitalizations Spiking in South, West
Could Threshold for COVID-19 Herd Immunity Be Lower Than Thought?
COVID-19 Death Risk Twice as High in New York City as Some Countries
Stroke Appears 8 Times More Likely With COVID Than With Flu
