This Seasonâs Flu Shot Is Shaping Up to Be Very Effective

The vaccine used in South America was found to be less and less effective as the flu s Thatâs progressed.

Tracking flu trends below the equator helps medical teams and public health officials prepare for flu season u the United States ne-third of U.S. adults and kids have gotten this year's flu shot, lagging s the Southern Hemisphere s compared to last year.

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