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.

With dengue on the rise this monsoon, doctors advise rest, hydration and medical care. Avoid panic, self-treatment and online ...

Once limited to tropical and subtropical climates, the Aedes mosquitoes that transmit these diseases are spreading to new ...