In pandemics of the past, caution for the future

A novel flu circulated in some American cities in April and May of 1918, causing mild illness and going largely unnoticed. It returned in September, and again in January, eventually killing more than 500,000 people nationwide.

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<p><a href="http://www.physorg.com/news162398118.html">In pandemics of the past, caution for the future</a></p> <p>A novel flu circulated in some American cities in April and May of 1918, causing mild illness and going largely unnoticed. It returned in September, and again in January, eventually killing more than 500,000 people nationwide.</p>