What is the difference between disinfection and sterilization?

• A. Disinfection kills SOME microorganisms; Sterilization kills EVERYTHING including spores
• B. Disinfection kills all organisms; Sterilization kills none
• C. Disinfection uses heat; Sterilization uses chemicals
• D. Disinfection wastes time; Sterilization is faster

Answer: (A)

The main idea is the extent of microbial destruction. Disinfection reduces or eliminates most pathogenic microorganisms on inanimate surfaces, but it does not guarantee killing every organism, especially resistant spores. Sterilization, on the other hand, aims to destroy all forms of microbial life, including spores, so the item is considered sterile. That’s why the statement that disinfection kills SOME microorganisms and sterilization kills EVERYTHING including spores best captures the difference.

Some disinfectants can inactivate many pathogens, but they do not guarantee the elimination of spores, and sterilization methods are specifically designed to achieve true sterility. The other descriptions aren’t accurate because disinfection does not kill all organisms, sterilization is not about killing none, and the idea that disinfection uses heat while sterilization uses chemicals is an oversimplification.