So far, cases of swine flu at Oklahoma State University have been mild - Article Photos 2/2

FILE - This 2009 file microscope image originally provided by the Centers for Disease Control and Prevention, shows a negative-stained image of the H1N1 flu virus. (AP Photo/Centers for Disease Control and Prevention, C. S. Goldsmith and A. Balish, File) ** NO SALES ** ORG XMIT: WX101