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The biological indicator used to monitor steam sterilization contains spores of

  • A.Staphylococcus aureus
  • B.Clostridium tetani
  • C.Geobacillus stearothermophilus
  • D.Escherichia coli

Answer: C

These spores are markedly more resistant to moist heat than anything expected in the load, so their death is good evidence the cycle worked. A different organism, Bacillus atrophaeus, serves the same purpose for dry heat and ethylene oxide.

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