Which term is most closely associated with a surface or item that harbors infectious organisms?

• A. Contaminated
• B. Clean
• C. Sterile
• D. Sanitized

Answer: (A)

Contaminated describes a surface or item that carries infectious organisms. In infection control, this term signals that the surface isn’t safe as-is and needs proper cleaning, disinfection, or sterilization before use. A surface that is clean is free of visible soil but can still harbor microorganisms; sterile means all viable microorganisms have been eliminated; sanitized means the microbial level has been reduced to a safe level but may not be completely free of organisms. Since the surface is described as harboring infectious organisms, contaminated is the best fit because it directly indicates the presence of pathogens.