Invasion of micro-organism to a susceptible host is known as?

Appeared in: KPSC Staff Nurse - 2017

Explanation

Infection is defined as the entry, development, and multiplication of an infectious agent in the body of a host.
This process implies that the microorganism has breached the host's defenses and is actively replicating.
An infection may or may not lead to a clinically apparent disease state.
The key elements are invasion and multiplication, which distinguishes it from mere presence (contamination).

Option A: Inflammation is the body's physiological response to tissue injury or infection, characterized by signs like redness and swelling. It is a reaction to a problem, not the problem of microbial invasion itself.
Option C: Infiltration is a specific term used in intravenous (IV) therapy. It describes the leakage of IV fluid into the surrounding subcutaneous tissue, which is a procedural complication, not an infectious process.
Option D: Contamination refers to the presence of an infectious agent on a body surface or an inanimate object. It does not imply invasion or multiplication within the host.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Infection as background academic context rather than a clinical decision trigger.
Understanding the difference between infection and contamination is fundamental to all nursing practices, especially hand hygiene, wound care, and sterile procedures.
Nurses play a critical role in breaking the chain of infection through actions like proper handwashing, using personal protective equipment (PPE), and ensuring environmental cleaning.
Recognizing the early signs of infection (which often include inflammation) allows for prompt intervention, preventing complications like sepsis.

How to Approach the Question

First, analyze the question stem to identify the key concepts. The stem asks for the term describing the 'invasion' and 'multiplication' of a 'micro-organism' in a 'host'.
Next, define each option in your mind based on your nursing knowledge.
Evaluate 'Inflammation': This is a response, not the invasion itself.
Evaluate 'Infection': This term directly matches the definition of microbial invasion and multiplication.
Evaluate 'Infiltration': This relates to IV therapy, not microorganisms in general.
Evaluate 'Contamination': This means the germs are present but haven't invaded or multiplied.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 86-88

E6 Nursing Fundamentals Taylor p. 163-165

E6 Medicine Davidson Principles Practice 24e p. 120-122

Practise the full KPSC Staff Nurse - 2017

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