B. stearothermophilus (biological indicator)

Bacillus stearothermophilus is a type of bacteria commonly used as a biological indicator to test the effectiveness of sterilization processes, particularly in healthcare and laboratories. It is resistant to heat and certain sterilization methods, making it an ideal organism to verify that the conditions used can effectively eliminate harmful microbes. To use it, a sample containing these spores is exposed to the sterilization process, and if the spores are not killed, it indicates that the process was inadequate. This helps ensure that tools and environments are safe and free from infectious agents.