n engl j med 365;9 nejm.org september 1, 2011 868 data). We therefore regard with skepticism the assumption that physiologically relevant contamination occurred, when only three of five donors consumed several handfuls of peanuts the night before donation. Given that food allergy affects 4 to 6% of children in the United States, it is critical that the potential public health risk of allergencontaminated blood products be clarified with rigorous study and not an unsubstantiated and speculative report. Brian P. Vickery, M.D. A. Wesley Burks, M.D.