http://www.plosmedicine.org/
PLoS Medicine is an open-access journal

http://www.plosbiology.org/ PLoS Biology
has an introductory article Pandemic Influenza: The Inside Story

The Public Library of Science (PLoS) is a non-profit organization of scientists and physicians committed to making the world’s scientific and medical literature a freely available public resource. http://www.plos.org/
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SCIRUS Search for scientific information
http://www.scirus.com/srsapp/