Microbiology Which type of Bacillus is used to test efficacy of Sterilisation by Autoclave? A Bacillus subtilis B Bacillus pumilis C Bacillus stearothermophilus D Coxiella burnetti 💡 Explanation Which type of Bacillus is used to test efficacy of Sterilisation by Autoclave? ✓ Correct Answer: C. Bacillus stearothermophilus