U.S. health officials Wednesday announced plans to offer COVID-19 booster shots to all Americans to shore up their protection amid the surging delta variant and evidence that the vaccines’ effectiveness...

After her longtime friend died of COVID-19, Abigail Echo-Hawk sat in her chair crying. She wondered if her friend and mentor, a Native Indian like her, would be counted among the deaths—a worry that...

Even though 11.4 million doses of the approved Pfizer and Moderna COVID-19 vaccines had been distributed across the United States by Monday morning, just 2.1 million had made it into the arms of high-risk...

More than a million Americans have received the first dose of their COVID-19 vaccines, a milestone in the biggest immunization drive in US history that came even as officials admitted the pace of rollout...

Infectious disease outbreaks have killed more people than hurricanes, wildfires or earthquakes. The 1918 influenza pandemic was the most severe pandemic in recent history, with death estimates ranging...