What is cross contamination?

• A. A process of cleaning floors
• B. Transmission of infection between people or surfaces
• C. A dictionary term for germs
• D. A method of sterilizing equipment

Answer: (B)

Cross contamination means the spread of infection from one source to another through a route such as direct touch, contact with contaminated hands or instruments, or contact with contaminated surfaces. In a dental setting, this is the real concern: germs can move from a patient, a contaminated instrument, or a dirty surface to a clinician, a colleague, or another patient if precautions aren’t followed. That’s why standard precautions—hand hygiene, wearing appropriate PPE, proper cleaning and disinfection of surfaces, and correct instrument processing—are essential to prevent the transfer of pathogens. It’s not about cleaning floors, nor is it a dictionary term for germs, nor a method of sterilizing equipment; it’s about the mechanism by which infection can be transmitted between people or surfaces.