The method of reducing the number of pathogens from any article, surface or medium is known as?

Appeared in: ISRO- 2016

Explanation

Disinfection is the process that destroys most pathogenic and other microorganisms by physical or chemical means.
The key part of the definition that matches the question is that it reduces the number of harmful microbes.
Unlike sterilization, disinfection does not ensure the elimination of all microbial forms, such as bacterial spores.
It is the appropriate term for processing items or surfaces where the complete absence of all life is not required.

Option A: Sterilization is a more absolute process that aims to eliminate all forms of microbial life, including highly resistant bacterial spores. The question asks for a method that reduces pathogens, not necessarily eliminates all of them.
Option B: Incineration is a high-temperature waste treatment process that involves burning. It is a method of disposal and terminal sterilization, not a routine procedure for reducing pathogens on reusable articles or surfaces.
Option D: Lysis refers to the biological process of a cell breaking open and disintegrating. It is a mechanism of cell death, not a method or procedure used in infection control to decontaminate surfaces or equipment.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infection Control: Levels of Decontamination as background academic context rather than a clinical decision trigger.
Nurses must apply the correct level of decontamination based on an item's use, often guided by the Spaulding Classification (critical, semi-critical, non-critical items).
Using disinfection when sterilization is required (e.g., for a surgical instrument) can lead to severe healthcare-associated infections (HAIs).
Proper use of disinfectants involves adhering to manufacturer guidelines for concentration, contact time, and temperature to ensure efficacy.

How to Approach the Question

First, identify the key term in the question stem: 'reducing the number of pathogens'. This implies a decrease in microbial load, but not necessarily total elimination.
Next, evaluate each option against this key concept.
Recall the formal definitions in infection control. 'Sterilization' means killing all microbes, including spores.
'Disinfection' means killing most pathogens but not necessarily spores. This aligns with 'reducing'.
'Incineration' is a method of destruction by fire, used for waste disposal.
'Lysis' is a biological process of cell rupture, not a decontamination procedure.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 172-174

E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 126-128

E6 Pharmacology Katzung 16e p. 1394-1396

Practise the full ISRO- 2016

Attempt every question from this paper in a timed mock, then review the full solution for each one.