Which of the following is a method of killing microorganisms with their spores?

JODHPUR AIIMS SNO-2018

Applied Microbiology & Infection control

Easy

Appeared in: JODHPUR AIIMS SNO-2018

Explanation

Sterilization is defined as a validated process used to render a product free from all forms of viable microorganisms, which explicitly includes bacterial spores.
Bacterial spores are highly resistant, dormant structures that can survive harsh conditions where vegetative bacteria cannot. Therefore, a process specifically designed to kill them is required for items used in sterile procedures.
Common sterilization methods in healthcare include autoclaving (steam under pressure), dry heat, ethylene oxide gas, and hydrogen peroxide plasma.
The term encompasses all other valid options (Flaming, Incineration) as they are specific methods to achieve a sterile state.

Option B: Disinfection destroys most pathogenic microorganisms but does not reliably eliminate bacterial spores. It is considered a less lethal process than sterilization.
Option C: Flaming is a specific method of dry heat sterilization. While it does kill spores, 'Sterilization' is the broader and more comprehensive term that defines the overall process.
Option D: Incineration is a destructive method of sterilization used for waste disposal. Like flaming, it is a specific type of sterilization, making 'Sterilization' the better, more general answer.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Principles of infection control, specifically the methods for eliminating microorganisms as background academic context rather than a clinical decision trigger.
Understanding the difference between sterilization and disinfection is critical for patient safety. Using a merely disinfected instrument in a surgical procedure can introduce spores into a sterile body cavity, leading to severe infections like gas gangrene or tetanus.
Nurses are responsible for ensuring that the correct level of decontamination is used for different medical devices based on their intended use (Spaulding Classification: critical, semi-critical, non-critical).
What if? If a surgical instrument set was only disinfected instead of sterilized, the nurse's priority action would be to immediately stop the procedure, notify the surgeon and infection control department, and quarantine the instruments. The patient would need to be monitored closely for signs of a post-operative infection.

How to Approach the Question

First, identify the key terms in the question: 'killing microorganisms' and 'with their spores'.
The phrase 'with their spores' is the most critical piece of information, as spores are the most resistant form of microbial life.
Evaluate each option based on this requirement.
Recall the definition of Disinfection. It kills many pathogens but is not effective against spores. Eliminate this option.
Recall the definition of Sterilization. It is the process of killing ALL microbial life, including spores. This is a strong candidate.
Consider Flaming and Incineration. These are specific techniques. Both are forms of sterilization that do kill spores.

Concept Tested & Keywords

Concept Tested: Principles of infection control, specifically the methods for eliminating microorganisms.
Stem keywords: killing microorganisms, spores
Lead-in keywords: Which

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