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FD-302a (Rev. 10-6-95) b6 b7C 279A-WF-222936-USAMRIID b6 Continuation of FD-302 of ,On _04/07/2004 b7C Page b7F The concentration of anthrax used in the aerosol challenge depended on the desired post-challenge concentration.. For a long period, only the material. provided by Dugway was utilized in the aerosol challenges at usAMRIID. stated that BRUCE b6 Ivins wanted to do the plating of the material. b7C of his challenges personally said that Ivins would plate 0.1. or 0.2 ml of material. and that the amount plated differed for each PI.. IVINS and grew material used in the challenges. ]IVINS and were always present for studies involving aerosol challenges. 1f any logs indicated that. was the PI, it was IVINS that was handling the aerosol challenge. for also