A sterilization control of paper impregnated with spores of the heat-resistant organism, Bacillus stearothermophilus, and specific culture media in a dehydrated state is described. When suspended in distilled water, the media will elute from the test strip and support the growth of surviving bacteria. The necessity of preparing media for culturing the controls is eliminated.
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P.H. Vereijken (2003) studied this question.
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