Geographic prevalence of blood product recall events. (A) County-level RED heat map for blood product recall event prevalence in the United States. RED was estimated by dividing the number of recall events originating from a county with the number of blood product establishments within that county. (B) County-level RED for blood product recall events. (C) County-level hot spot analysis for likelihood of blood product recall events. Colored regions represent the likelihood of recall event occurrence at 99% confidence level, and dots represent the locations of blood product establishments in the United States.