Flu is a respiratory illness that's caused by flu viruses, and "most experts believe that flu viruses spread mainly by tiny ...

As respiratory illness season begins, COVID cases have remained under control in the U.S. Here's what to know.

WASHINGTON -- The coronavirus may have been circulating for weeks undetected in Washington state, a preliminary finding that could mean hundreds of undiagnosed cases in the state that's also home to ...

COVID-19 viral activity was high in the United States during the first week of September, according to fresh data from the Centers for Disease Control and Prevention. Some regions of the United States ...

A new COVID variant known as the "XEC variant" is raising questions and capturing the attention of researchers heading into the fall and winter season. The variant has been largely spreading overseas ...

As the weather cools and fall approaches, COVID-19 cases are still spiking in much of the United States. The country has yet to emerge from a late summer COVID wave driven by the highly contagious new ...

COVID-19 case data show Indiana is among multiple states producing "very high" viral activity at the end of the August, according to the Centers for Disease Control and Prevention (CDC). Some regions ...