Lt. Col Teresa Nesselroad, 633rd Medical Group allergist, checks the reaction of a baby after a skin prick test, Feb. 21, 2013, at U.S. Air Force Hospital Langley, Va. Skin prick tests consist of a series of tiny needles coated in an allergen inserted into the skin to test for small allergic reactions. (U.S. Air Force photo by Airman 1st Class Austin Harvill/Released)