Study: Mexico has thousands more swine flu cases

Miguel Tovar/AP

A boy wearing a mask as a precaution against swine flu poses for a picture during his first day of school since the outbreak of swine flu in Mexico City, Monday, May 11, 2009. Scoured and disinfected, most of Mexico’s primary schools and kindergartens stood ready to welcome back millions of students Monday after a nationwide shutdown ordered to help put a brake on the spread of swine flu.