Best indicator for sterilization by autoclaving ?: (A) Bacillus subtilis, (B) Geobacillus, (C) Bacillus pumilis, (D) Clostridium
Answer is B. Ans. is 'b' i.e., Geobacillus Biological indicators Biological indicators are standardised preparations of microorganisms used to assess the effectiveness of a sterilization process. They usually consist of a population of bacterial spores placed on an ine carrier, for example a strip of filter paper, a glass slide or a plastic tube. Most commonly, spores of Bacillus stereothermophilus (Geobacillus stearothermophilus) are used. Spores of Bacillus subtilis and Bacillus pumilis are alse used.