What is a covert release in public health risk terms?

• A. A routine public health drill released to staff
• B. An unannounced release of a biologic agent that causes illness or other effects
• C. A scheduled vaccine distribution
• D. A regulated release of a benign agent

Answer: (B)

The main idea here is that covert means hidden or secret. A covert release in public health risk terms is a deliberate, secret release of a biological agent into the environment or population that can cause illness or other effects, with the aim of avoiding detection for as long as possible. This description fits an unannounced release of a biologic agent that causes illness, because it involves both secrecy and harm. The other options describe activities that are planned and disclosed (a routine drill, a scheduled vaccine distribution) or involve a benign, regulated release that would not cause illness, so they do not capture the hidden, harmful nature of a covert release.