The Aztec Stadium, one of the world's largest soccer stadiums, sits empty as America plays Tecos in a Mexican League game. Thousands of fans had to forgo their beloved weekly tradition Sunday, forced by the flu outbreak to cheer from their living rooms instead of the sun-soaked seats.

Riot police stand in front of Mexico's National Autonomous University soccer stadium, which was closed to the public shortly before a game between Chivas and the Pumas. Although the game was a sellout, the famous volcanic-rock bleachers were empty, owing to the crisis. This will mean reimbursing more than $500,000 to ticketholders and losing additional money in concessions, especially beer sales

Lazaro Gonzalez, 40, wears a protective mask as he waits for passersby to donate money to him. Health experts say the virus comes from the same strain that causes seasonal outbreaks in humans. But they claim this newly detected version contains genetic material from versions of flu that usually affect pigs and birds

A couple attempts to kiss. Across Mexico, more than 1,300 people were tested for suspected swine flu infection and 400 were taken to hospital for checks. Health officials believe that tens of thousands, and possibly more, have been infected but have since recovered