California Registered Dental Assistant (RDA) Written Practice Exam

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Which microorganism is used to identify a disinfectant as intermediate level?

E. coli
Staphylococcus aureus
M. tuberculosis var bovis
Pseudomonas aeruginosa

The correct answer is: M. tuberculosis var bovis

The other options listed, E. coli, Staphylococcus aureus, and Pseudomonas aeruginosa, are commonly used to identify disinfectants as low level or high level respectively. However, M. tuberculosis var bovis is specifically used to determine if a disinfectant is effective at an intermediate level. This is because M. tuberculosis is a type of bacteria that is more resistant to disinfectants, making it a better indicator for intermediate level disinfectants.