Health officials around the world worked to contain what appears to be a spreading swine flu outbreak early Monday, while one out of every five residents of Mexico's most populous city wore masks to protect themselves against the virus.
CNN.com, CNN
Sun, 04/26/2009 - 10:16pm
Health officials around the world worked to contain what appears to be a spreading swine flu outbreak early Monday, while one out of every five residents of Mexico's most populous city wore masks to protect themselves against the virus.