The H1N1 flu virus (red) is pictured in this handout photograph taken on July 9, 2009 and released on July 13, 2009. The new H1N1 influenza virus bears a disturbing resemblance to the virus strain that caused the 1918 flu pandemic, with a greater ability to infect the lungs than common seasonal flu viruses, researchers reported Monday. REUTERS/Image courtesy of Yoshihiro Kawaoka/University of Wisconsin-Madiso/Handout (UNITED STATES SCI TECH HEALTH IMAGES OF THE DAY) FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS
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