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.

From the outset of the Trump administration, bird flu, or H5N1 avian influenza, has flown rather conspicuously — and in fact ...

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.

What defines a fever? And when should you seek help? Learn about the causes, signs, and symptoms of fever.

The WHO warns that a new, more dominant COVID strain is on the loose—and spreading rapidly. What to know about the XFG ...

Researchers' findings, published in June, indicate the highest incidence of Valley fever in the northwest and southwest parts ...

Nipah, a zoonotic virus, causes fever, headache, and can lead to coma. Kerala has faced multiple Nipah outbreaks in recent ...