19 March 2013; volume 368, issue 1614
Cover image: Composite image of the original map made by John Snow in 1854 (Snow J. 1855 On the mode of communication of cholera, 2nd edn, London, UK: John Churchill), influenza virus model (CDC Public Health Image Library) and a phylogeographic reconstruction of A/H1N1/09pdm influenza pandemic (courtesy of Philippe Lemey, Marc Suchard and Andrew Rambaut; http://phylogeography.org/). Globe image from GoogleEarth (© 2013 CNES/SPOT Image; Data SIO, NOAA, U.S. Navy, NGA, GEBCO).
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