The biologic standard used to test the efficiency of sterilization involves the use of
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
Spores of Clostridium tetani
Streptococcus pneumoniae
Spores of Vibrio
Mycoplamsa
general microbiology