Mexicans wear masks to prevent swine flu in Mexico city, capital of Mexico, on April 26, 2009. Five people have died of swine flu in the last 24 hours in Mexico City, bringing the total of those killed to 15 in the capital, Mexico City's mayor, Marcelo Ebrard, told media on Sunday. [Xinhua]

Subway passengers wear masks to prevent swine flu in Mexico city, capital of Mexico, on April 26, 2009. Five people have died of swine flu in the last 24 hours in Mexico City, bringing the total of those killed to 15 in the capital, Mexico City's mayor, Marcelo Ebrard, told media on Sunday. [Xinhua]