The H5N1 avian flu is circulating in cows and other mammals. Whether it will make a permanent leap to humans is another ...

Bird flu was nearly everywhere in the U.S.—in chickens, cows, pet cats and even humans. Cases have gone down, but experts ...

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 ...

Diphtheria is a highly contagious infection that suffocates its victims by forming a thick grey coat over the throat and ...

Here’s how to tell the difference between mosquitoes, chiggers and no-see-ums by their bites and how to treat and prevent ...

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