** FILE ** Nurse practitioner Susan Brown prepares a flu vaccination for a patient on Friday, Aug.  27, 2010, in Rockville, Md. (AP Photo/Evan Vucci)

Photo by: Evan Vucci

** FILE ** Nurse practitioner Susan Brown prepares a flu vaccination for a patient on Friday, Aug. 27, 2010, in Rockville, Md. (AP Photo/Evan Vucci)