NEW YORK - MAY 4: Students enter St. Francis Preparatory School as it re-opens after closure due to a swine flu outbreak May 4, 2009 in the Fresh Meadows neighborhood of the Queens borough of New York City. St. Francis Prep was closed for a week after students and teachers experienced flu-like symptoms, with 45 confirmed cases of swine flu. Despite encouraging signs, health officials around the world are warning that swine flu still poses a very real threat to the public. (Photo by Spencer Platt/Getty Images)
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