Medical Device Reprocessing Association of Ontario (MDRAO) Practice Exam

How do microbe survival characteristics vary?

1. All microbes are equally resilient

2. Some have resistance to various methods while others do not

3. Only environmental factors affect survival

4. Microbes always die at the same rate

The correct answer is: Some have resistance to various methods while others do not

Microbe survival characteristics vary significantly among different types of microorganisms. Some microbes possess inherent resistance to various environmental threats and methods of disinfection, while others are more susceptible to these challenges. This variability is influenced by factors such as the organism's cellular structure, genetic makeup, and past exposure to antimicrobial agents. Certain bacteria, for example, have evolved mechanisms to withstand antibiotics or harsh conditions, while others may be easily eliminated by standard cleaning and disinfection methods. The presence of protective outer membranes, biofilm formation, or spores enhances the survival ability of specific microbes in extreme conditions. Understanding this variability in resistance is critical in medical device reprocessing, as it informs the selection of appropriate cleaning and sterilization methods for specific types of instruments and materials, ensuring that all pathogens are effectively eliminated. This highlights the importance of tailoring disinfection and sterilization protocols to the specific characteristics of the microbes that may be present.