CDC categories of biologic agents

CDC cat·e·go·ries of bi·o·log·ic a·gents

(kat'ĕ-gōr-ēz bī-ŏ-loj'ik ā'jĕnts)
Three categories (Category A, the highest risk; Category B, the next highest risk; and Category C) used by the U.S. Centers for Disease Control and Prevention (CDC) to rank biologic warfare agents.