Which scenario best describes a contaminated state?

• A. A surface that has been properly cleaned and maintained.
• B. A surface that has been disinfected.
• C. A sterile syringe that is sealed.
• D. A site infected or compromised by microorganisms.

Answer: (D)

Contamination means microorganisms are present where they shouldn’t be. When a surface has been properly cleaned and maintained, the goal is to remove dirt and reduce microbes, so it isn’t contaminated. Disinfecting also aims to kill or remove most pathogens, leaving the surface not contaminated. A sterile syringe that is sealed is free of microorganisms, so it is not contaminated either. A site infected or compromised by microorganisms shows the very presence of microbes, which is what “contaminated” describes. So this scenario best matches contamination because microorganisms are present where they shouldn’t be.