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The phenol coefficient of a disinfectant expresses its activity

  • A.as the lowest concentration that prevents visible growth
  • B.as the time needed to kill all bacterial spores
  • C.as the proportion of phenol it contains
  • D.relative to that of phenol under the same conditions

Answer: D

The test compares the dilution of the agent that kills a test organism in a set time with the dilution of phenol that does the same. A coefficient above one means the agent is more potent than phenol, and below one less so.

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