Figure 4.

Black-light examination of animal room equipment after completion of study 1. (A) No contamination powder within any of the cages or on any of the inanimate objects within cages (representative cage side that was handled during the study shown). (B) XR7 powder (indicating a participant without shoe covers) on a step ladder used to access the top row of cages. (C) Krypton powder (indicating a participant with shoe covers) on the lower rung of the ventilated rack, which was used as a step to gain access to the top row of cages.