Which code alerts hospital staff to a biological agent threat?

The correct answer is that Code Yellow is the designated alert for a biological agent threat in a hospital setting. This code is used to inform hospital staff about the potential presence of a biological agent that could lead to widespread infection or harm to the public or specific populations. Using Code Yellow ensures that all staff are aware of the situation and can take the appropriate measures to protect patients, themselves, and the community.

In terms of context, other codes serve different critical functions; for instance, Code Blue typically refers to a medical emergency, often indicating a cardiac arrest, requiring immediate resuscitation. Code Gray is associated with disruptive behavior or a violent person on the premises, rather than a biological threat. Code Pink is used for infant or child abduction situations. Each code has a specific purpose, which is crucial for clarity and quick response in crisis situations.