HOLD FOR RELEASE AT 11 a.m. EDT--FILE --In a May 6, 2009 file photo a store attendantholds an N-95 mask over a box of disposable surgical masks in Manila, Philippines. Health workers caring for patients who have or may have swine flu should wear a special type of mask called an N95 respirator, not looser-fitting surgical masks, the Institute of Medicine advised Thursday Sept. 3, 2009. (AP Photo/ Pat Roque/file)

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