Cross Infection can occur through following except

RRB Staff Nurse Jaipur-6th June 2018

Applied Microbiology & Infection control

Easy

Appeared in: RRB Staff Nurse Jaipur-6th June 2018

Explanation

The core concept is identifying which option is NOT a method of transmitting infection.
Autoclaving is a sterilization technique designed to destroy all microorganisms using high-pressure steam.
Unlike the other options which are pathways for pathogens to spread, autoclaving is a critical procedure for infection prevention and control.
Therefore, it is the exception in a list of ways cross-infection can occur.

Option A: Fomites are a well-established mode of indirect contact transmission. They are inanimate objects that become contaminated and transfer pathogens to a new host.
Option C: Contaminated food and drinks are a primary example of vehicle-borne transmission, where pathogens are ingested, leading to infection.
Option D: Insects are common vectors that transmit infectious agents, either mechanically or biologically, from a reservoir to a susceptible host.

Visual 1: Diagram - The Chain of Infection. This would illustrate the six links (infectious agent, reservoir, portal of exit, mode of transmission, portal of entry, susceptible host) and show where methods like autoclaving break the chain.
Visual 2: Image - An Autoclave. A picture of a hospital autoclave would help learners visualize the equipment used for this sterilization method.

Clinical Relevance

Nursing practice connection: Knowing Modes of infection transmission and prevention helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Breaking the chain of infection is a fundamental responsibility of a nurse. Understanding modes of transmission is essential for implementing appropriate precautions (e.g., contact, droplet, airborne).
Nurses are directly responsible for ensuring that reusable medical equipment is properly sterilized before use. A failure in this process, such as using an instrument that was not autoclaved, can lead to severe healthcare-associated infections (HAIs).
What if? If an instrument is heat-sensitive and cannot be autoclaved (e.g., certain plastics or fiber-optic scopes), the nurse must know the correct alternative sterilization method, such as chemical sterilization (e.g., ethylene oxide) or high-level disinfection, to ensure patient safety.

How to Approach the Question

First, identify the keyword 'except'. This signals that three of the options are correct examples of something, and one is the outlier.
Next, define the core concept in the question stem: 'Cross Infection'. This means the transfer of harmful microorganisms.
Evaluate each option against this definition: Does this cause or facilitate the transfer of microorganisms?
Fomites (yes), Contaminated food (yes), Insects (yes). These are all modes of transmission.
Autoclaving (no). This is a process to kill microorganisms.
The option that does not fit the pattern is the correct answer.

Concept Tested & Keywords

Concept Tested: Modes of infection transmission and prevention.
Stem keywords: Cross Infection, occur through
Lead-in keywords: except
Negative lead-in flag: The question uses the word 'except', requiring identification of the option that does not fit with the others.

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