CDC Category A biologic agents

CDC Cat·e·go·ry A bi·o·log·ic a·gents

(kat'ĕ-gōr-ē bī-ŏ-loj'ik ā'jĕnts)
Those biologic agents and toxins considered by the CDC to represent the highest-priority agents because of their ease of dissemination or transmission from person to person and potential for producing high mortality rates and a major impact on public health.