Define disinfection.

• A. Sterilization
• B. Cleaning
• C. Antisepsis
• D. The physical or chemical destruction of microorganisms

Answer: (D)

Disinfection means using physical or chemical methods to destroy microorganisms on inanimate surfaces, reducing their numbers to a level that lowers infection risk. This focuses on non-living objects and uses agents or conditions that kill pathogens rather than merely remove soil or sterilize everything. It’s different from sterilization, which aims to eliminate all forms of life (including spores); from cleaning, which is about removing dirt and debris; and from antisepsis, which targets living tissue to prevent infection without harming the host. The definition described here matches disinfection well—the emphasis on physical or chemical destruction of microorganisms on non-living surfaces.