Which term describes contamination of responders or equipment after initial exposure?

• A. Primary contamination
• B. Tertiary contamination
• C. Secondary contamination
• D. Quaternary contamination

Answer: (C)

Contaminants can move from the initial exposure to responders or equipment, creating risk beyond the first contact. The moment a person or gear first touches the hazardous material, that surface is contaminated—that's primary contamination. If that contaminant is carried away and ends up on other surfaces or people after initial contact, without proper decontamination, it becomes secondary contamination. This is the kind of transfer you worry about when a responder leaves the hot zone still wearing contaminated gloves or touches a clean door handle, spreading the material. Proper decontamination and careful doffing are essential to stop this spread.

Not primary contamination because that describes the contamination at the point of first contact, not the spread after. Not tertiary or quaternary for this scenario, since those terms would imply further transfers beyond the immediate secondary transfer described here.