NEW YORK (AP) — The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.

Flu cases had previously peaked this season at the very end of December. At week 52 —ending on December 28—the percentage of ...

Flu activity has surged to high levels in many states, overwhelming some hospitals. Experts discuss what to expect for the 2024-25 flu season and how to stay safe.

Swine Flu' Strain Has Passed from Humans to Swine Nearly 400 Times Since 2009 July 27, 2023 — A new study of the strain of influenza A responsible for the 2009 H1N1 pandemic -- pdm09 -- shows ...

2009 H1N1 virus is more virulent than seasonal flu viruses in laboratory animals with no previous influenza immunity. This report suggests, however, that internal antigens of 2009 H1N1 are less ...

Cases of the flu continue to rise nationwide and now appear to be higher than they've been in at least three decades, ...

In a season unlike any other, the U.S. is facing a viral onslaught not seen in years. With flu cases soaring, the landscape ...

A federal scientific publication has returned from a forced two-week hiatus with two papers examining the health effects of ...

Last week, outpatient visits for influenza-like illness reached the highest level seen since the peak of the 2009-2010 flu season, during the swine flu ... the H3N2 and H1N1 strains, according ...