The current flu season has seen the highest rate of doctor’s visits for flu-like symptoms since the US began collecting data through a national surveillance network. CNN is tracking these case rates ...

Flu season is not over yet, experts warn. Is there a second wave coming? Here's how to protect yourself as influenza keeps spreading.

Flu cases are ticking down, but experts warn the U.S. isn’t out of the woods yet. Fifteen more children died from the flu in the week ending Jan. 10, bringing the total of pediatric deaths to 32. On ...

A respiratory virus that once primarily affected birds and rarely infected humans has undergone a concerning transformation. H5N1, commonly known as bird flu, has established an unprecedented foothold ...

News that northern China is seeing a surge of the respiratory illness called human metapneumovirus (HMPV), bringing an uptick in hospitalizations, is sparking a bit of anxious déjà vu on social media.