Which statement accurately describes low-level disinfectants?

Which statement accurately describes low-level disinfectants?

• A. Low-level disinfectants kill most bacteria and fungi, but may not kill certain strains of fungi or viruses.
• B. They reliably kill spores.
• C. They are never used on surfaces.
• D. They are the same as high-level disinfectants.

Answer: (A)

Low-level disinfectants have a limited spectrum of activity: they are designed to inactivate many vegetative bacteria and some fungi and viruses, but they do not reliably kill bacterial spores. This restricted effectiveness means they’re suitable for noncritical surfaces that only contact intact skin, not for devices or areas that involve mucous membranes or sterile fields. In practice, enveloped viruses are more likely to be affected by these agents, while non-enveloped viruses and certain fungal strains can resist them, which is captured by saying they may not kill certain strains of fungi or viruses. The idea that they kill spores, or that they’re the same as high-level disinfectants, isn’t correct, and low-level disinfectants are not used for surfaces that require sporicidal activity or for most equipment that contacts mucous membranes.

Low-level disinfectants have a limited spectrum of activity: they are designed to inactivate many vegetative bacteria and some fungi and viruses, but they do not reliably kill bacterial spores. This restricted effectiveness means they’re suitable for noncritical surfaces that only contact intact skin, not for devices or areas that involve mucous membranes or sterile fields. In practice, enveloped viruses are more likely to be affected by these agents, while non-enveloped viruses and certain fungal strains can resist them, which is captured by saying they may not kill certain strains of fungi or viruses. The idea that they kill spores, or that they’re the same as high-level disinfectants, isn’t correct, and low-level disinfectants are not used for surfaces that require sporicidal activity or for most equipment that contacts mucous membranes.