University of Michigan freshman Alicja Sobilo works at the front desk of the Alice Lloyd Hall in Ann Arbor, Mich., Jan. 31, 2007. Sobilo and hundreds of other University of Michigan students are part of a research study that could change the way the world looks at influenza. Researchers are trying to determine whether wearing surgical masks and hand sanitizing can prevent the spread of flu or other respiratory illnesses.
(Photo: AP Photo/Carlos Osorio)
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