The vaccine machine
SPANGDAHLEM AIR BASE, Germany – U.S. Air Force Staff Sgt. Sarah Ellis, 52nd Medical Operations Squadron NCO in charge of Allergy Immunizations from Mount Hood, Ore., measures the swelling of a reaction on Wildmer Santiago’s arm, April 2, 2013. Allergy immunizations slowly build up the bodies’ tolerance to certain organisms which help prevent reactions. (U.S. Air Force photo by Airmen 1st Class Kyle Gese/Released)

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Photo by: Airmen st Class Kyle GeseReleased |  VIRIN: 130402-F-OP138-079.JPG