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. 2007 May 11;3(5):e61. doi: 10.1371/journal.ppat.0030061

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© 2007 Munster et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The blue line and filled squares (▪) represent the proportion (%) of influenza A virus positive mallards caught and sampled in Sweden between 2002 and 2005 at Ottenby Bird Observatory. The red line and filled diamonds (♦) represent mallards caught at various locations in The Netherlands from 1998 to 2005.