A contagious new COVID-19 variant called NB.1.8.1, aka "Nimbus," is now dominant in the United States, CDC data show. What to know about symptoms and vaccines.

You’re not imagining it, flu cases are on the rise this season, as vaccination levels decline and COVID-style social distancing falls by the wayside.

When Nestor Montalvo woke up last September, he knew something was wrong. He had a headache, and his vision was blurred. The ...