Bacillus stearothermophilus

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Bacillus stearothermophilus (or Geobacillus stearothermophilus) is a rod-shaped, Gram-positive bacterium and a member of the division Firmicutes. The bacteria is a thermophile and is widely distributed in soil, hot springs, ocean sediment, and is a cause of spoilage in food products. It will grow within a temperature range of 30-75 degrees Celsius. It is commonly used as a challenge organism for sterilization validation studies and periodic check of sterilization cycles.

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