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Early in the pandemic, scientists and public health experts leaned on their experience with other viruses to make predictions about COVID...

A growing proportion of COVID-19 deaths are occurring among the vaccinated, a new ABC News analysis of federal data shows.I...

For much of the past two years, America has been first in line for COVID-19 vaccines and treatments. Now, as drugmakers develop the next...

Nearly 2,000 homeless people died in Los Angeles County during the first year of the pandemic, an increase of 56% from the previous year,...

A federal judge in Florida struck down a national mask mandate on airplanes and mass transit Monday, and airlines and airports swiftly be...

Several businesses and residents have filed suit in state court in Pennsylvania seeking to overturn Philadelphia's renewed indoor mas...

 California is sticking with its coronavirus vaccine mandate for schoolchildren, but it won't happen until at least the summer o...

It’s a weekend warrior’s nightmare. You’re playing hoops in the driveway and go up for a lay-up. You land and hear a pop: you’ve torn you...

Opioid overdose deaths in adolescents rose far more rapidly than the general population between 2019 and 2021, according to a new study o...

The U.S. has ordered all non-emergency consular staff to leave Shanghai, which is under a tight lockdown to contain a COVID-19 surge....