In the United States, flu shots are updated annually to include multiple types of influenza A and B viruses; scientists pick strains of the viruses expected to be dominant that year.
The Associated Press on MSN12d
Flu season in the US is the most intense it’s been in at least 15 yearsNEW YORK (AP) — The U.S. winter virus season is in full force, and by one measure is the most intense in 15 years.
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