Person or animal or object from where the infection spreads is called?

Appeared in: MP CHO-2018

Explanation

The term 'Source' refers to the person, animal, object, or substance from which an infectious agent is transmitted to a host.
It represents the immediate point of transmission in the chain of infection.
The question's phrasing, "from where the infection spreads," directly aligns with the definition of a source of infection.

Option A: The 'Agent' is the pathogen or microorganism (like a virus or bacterium) that causes the disease, not the place it spreads from.
Option B: The 'Host' is the susceptible person or animal who receives the infection and in whom the agent can cause disease.
Option D: The 'Reservoir' is the natural habitat where the infectious agent lives, multiplies, and on which it depends for survival. While the reservoir can be the source, the source is specifically the immediate point of transmission, which may be different.

Clinical Relevance

Nursing practice connection: Knowing Chain of Infection helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Identifying the source of an infection is a critical step in outbreak investigations and infection control. It allows healthcare professionals to implement targeted interventions to break the chain of transmission.
For example, if the source of a cholera outbreak is a contaminated well, the primary intervention is to close the well and provide safe drinking water.
What if the question asked, 'What is the natural habitat where an infectious agent lives and multiplies?' In that case, the correct answer would be 'Reservoir'.

How to Approach the Question

This is a definition-based recall question common in community health nursing.
First, identify the key phrase in the question stem: "from where the infection spreads."
Recall the definitions of the terms related to the chain of infection: Agent, Host, Source, and Reservoir.
Differentiate between 'Source' and 'Reservoir'. 'Reservoir' is the natural home of the agent, while 'Source' is the immediate point from which it is transmitted.
The phrase "spreads from" points directly to the immediate point of transmission.
Therefore, match this key phrase to its correct definition, which is 'Source'.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 87-89

E6 Microbiology Essentials Sastry 4e Part 1 p. 130-132

Practise the full MP CHO-2018

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