The Associated Press on MSN11d
Flu season in the US is the most intense it’s been in at least 15 years
The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.
The New York Times10d
What to Know About the Flu Virus
All four flu pandemics — in 1918, 1957 and 1968 and the swine flu pandemic of 2009 — were caused by Type A viruses. Influenza B viruses, however, only circulate in humans. They are divided ...