The federal government approved updated Covid-19 vaccines for the 2026-27 respiratory virus season last month, but the US ...

In the sickest COVID-19 patients, SARS-CoV-2 doesn't just cause severe damage by directly infecting airway cells. The virus can also trigger hyperinflammation—a cycle in which immune cells themselves ...

The US Food and Drug Administration has signed off on updated Covid-19 vaccines for many Americans.

Covid-19 has killed more than a million people in the United States, but in an interview with CNN’s Dana Bash on Sunday, US Department of Health and Human Services Secretary Robert F. Kennedy Jr. said ...

A population-based analysis of 20 U.S. counties found that 30-day mortality increased substantially in several bacteremia ...

Federal health officials caution that rising infections don't necessarily mean severe illness is also increasing.