Which term describes a system used to prevent contaminants from entering a space via footwear?

• A. Short-term care facility
• B. Air Sampling
• C. Waterborne
• D. Walk-off mats

Answer: (D)

Preventing contaminants from entering a space on footwear is addressed by a walk-off mat system. Walk-off mats placed at entrances are designed to remove soil, dust, and moisture from shoe soles as people enter, reducing the amount of contaminant carried into the space. They often combine a dry texture to abrade footwear with an absorbent layer to pick up moisture, sometimes in multiple stages, so fewer particulates reach the clean areas. In infection control, this is a passive barrier that lowers the risk of spreading contaminants, especially when used with proper cleaning protocols and orderly traffic flow. The other terms refer to unrelated concepts—facility type, airborne contaminant monitoring, or waterborne contamination—so they don’t describe footwear-based entry prevention.