If a contaminated individual leaves the hot zone without decontamination, the most likely outcome is:

• A. Nothing. All contaminates would be gone after the individual exited.
• B. The individual would be treated for exposure but is no risk to others.
• C. Contaminants would be transferred to other personnel or equipment.
• D. There would be direct contamination of the warm zone.

Answer: (C)

When a person who is contaminated moves from the hot zone into less-affected areas without decontamination, the contamination on their skin, clothing, or gear can be carried with them and easily transferred to others or to equipment they touch. This is the primary way contaminants spread in a response: through contact and shared surfaces, tools, or PPE. So the most likely outcome is secondary contamination of people or equipment in the warm zone, which is why decontamination and proper doffing procedures are essential before anyone leaves the hot zone.

Rationale for the other ideas: contaminants don’t simply disappear when someone exits a contaminated area, so “nothing would be left behind” isn’t accurate. Even if the person receives medical treatment, that doesn’t automatically stop the risk to others if decontamination hasn’t occurred, because transfer to others or to equipment can still happen. Direct contamination of the warm zone can occur, but the everyday mechanism that drives that risk is the transfer to people and gear through contact, making the transfer to personnel or equipment the most likely and significant outcome.