Mexican police officers with masks on in an attempt to protect themselves from a <a href="https://en.wikipedia.org/wiki/2009_H1N1_influenza_outbreak" class="extiw" title="w:2009 H1N1 influenza outbreak">swine flu outbreak</a>.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/24768749@N07">sari huella</a>
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/24768749@N07/3474744375/">Influenza porcina en México</a>
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