Who to Vaccinate when Flu Season Strikes (IMAGE)

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Who to Vaccinate when Flu Season Strikes

Caption

People are wearing face masks to prevent and control acquisition and transmission of influenza during the 2009 H1N1 influenza pandemic.

Credit

Demet/Flickr, <a target="_blank"href="https://creativecommons.org/licenses/by/2.0/">CC-BY</a>

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