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A high-level disinfectant is distinguished by being able to kill

  • A.lipid viruses only
  • B.organisms on living tissue without causing irritation
  • C.bacterial spores when used at sufficient strength
  • D.vegetative bacteria but never mycobacteria

Answer: C

Killing spores at adequate concentration and contact time is the defining capability, which is why high-level disinfection is accepted for semicritical items such as endoscopes. Given long enough, such agents approach sterilization.

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