People wear surgical face masks as they walk to the Metro station in Mexico City April 27, 2009. Schools in the Mexican capital, one of the world's biggest cities, were closed until May 6, but office workers said they had received few instructions from employers to stay home from the office. Governments around the world rushed to reduce the impact of a possible flu pandemic on Monday, as a swine flu virus that has killed 103 people in Mexico and spread to North America also reached Europe.
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