Apr. 27, 2009 -- NOGALES, SONORA, MEXICO: Workers on their lunch break walk through Nogales, Sonora, Mexico Monday with surgical masks to protect themselves from the swine flu. The Mexican government broadened its efforts to control the outbreak of swine flu Monday closing schools throughout the country. In Nogales, on Mexico's northern border with the US, people started wearing masks as news of the outbreak spread. Photo by Jack Kurtz
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