By Cat Bowen, Jan 21, 2020
“Flu season generally begins around October-November, and ends about March-April,” Kecia Gaither M.D. tells Romper. This year feels different because the B virus of the flu (the strain normally expected to be seen late in the flu season) has been the predominant flu virus according to the Centers for Disease Control and Prevention (CDC). An equal number of the A strain (H1N1pdm09) and the B strain of the virus (Victoria) have been reported in recent weeks. As Time explained, “a vaccine mismatch and reduced immunity to influenza B may have contributed to the early and severe start of this flu season.”
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