The biologic standard used to test the efficiency of sterilization involves the use of: (A) Spores of Clostridium tetani, (B) Streptococcus pneumoniae, (C) Spores of Vibrio, (D) Mycoplamsa
Answer is A. Spores of Clostridium tetani is used for Dry Heat; 106 spores are used.For moist heat, Bacillus stearothermophilus are usedReference: Ananthanarayan and Paniker&;s Textbook of Microbiology; 10th edition