Secondary contamination refers to contamination of which items after initial exposure?

• A. The wearer only
• B. PPE, equipment, and tools
• C. The environment only
• D. The incident scene only

Answer: (B)

Secondary contamination happens when the contaminant moves from the initial exposure area to other items that responders touch or use. The items most likely to pick up and spread the contaminant are PPE, equipment, and tools, because they come into direct contact with the hazard and can carry residues to new locations or to the wearer during handling or doffing. This is why decontamination efforts target cleaning and protecting these items—to prevent spreading the hazard beyond the original site. While the environment and the incident scene can become contaminated as well, the emphasis of secondary contamination is on the items used in the response and how they can transfer contamination further.