Health Sciences graduate Sharon Casey of Wilton, Conn., right, laughs with Stephanie Calefati, left, of Union, N.J. as she passes a bottle of hand sanitizer to other graduates at the start of Northeastern University's commencement ceremony in Boston Friday, May 1, 2009. Cases of the swine flu are increasing as college graduation season begins, and schools are doing what they can to keep the large crowds of people traveling from around the country and beyond from spreading or catching the disease. (AP Photo/Elise Amendola)