Which option best defines cross-contamination?

• A. Transmission of contaminated instruments that may contact a person's body and then to another person
• B. A minor delay in sterilization
• C. A standard method for cleaning surfaces
• D. A routine cleaning method

Answer: (C)

Cross-contamination is about the transfer of contaminants from one surface or item to another, often through contact that moves microbes from a contaminated instrument or surface to a person and then to someone else. It happens when proper barriers, hand hygiene, and sterilization between patients aren’t used, allowing pathogens to hitch a ride on hands, gloves, instruments, or surfaces and spread. It’s not describing a cleaning method or a delay in sterilization; those terms refer to removing contaminants or the process timing, not to how contaminants spread between patients. Understanding this helps explain why strict infection-control steps—proper instrument sterilization, hand hygiene, barrier protection, and cleaning/disinfection between patients—are essential to prevent transmission.