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In the February 25 Issue:
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How H1N1 flew
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The numbers of passengers arriving from Mexico between March 1 and April 30, 2008, show which cities around the world may have been most vulnerable to H1N1 transmission. Of the 20 countries receiving the largest number of passengers from Mexico, 16 had cases of H1N1 by May 25, 2009. Credit: The New England Journal of Medicine ©2009
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