Act of soiling or making impure by contact?

Appeared in: NHM UP Staff Nurse - 2016

Explanation

Contamination is the correct term for the act of soiling or making something impure through contact with an infectious agent.
It refers to the mere presence of microorganisms on a surface, which could be a person's skin, a surgical instrument, or a countertop.
This is the initial point of contact and does not necessarily mean an infection will occur.
For example, if a sterile instrument is touched by a non-sterile object, it is considered contaminated.

Option A: Sepsis is not the act of making something impure; it is a severe, life-threatening systemic inflammatory response to an established infection.
Option C: Colonization involves the presence and multiplication of microorganisms on or in a host, but without causing an active infection or symptoms. It is a step beyond simple contamination.
Option D: A culture is a diagnostic laboratory procedure used to grow and identify microorganisms from a patient sample (e.g., blood, urine, wound swab). It is a test, not a process of soiling.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infection Control Terminology as background academic context rather than a clinical decision trigger.
Understanding the difference between contamination, colonization, and infection is fundamental to nursing practice for preventing healthcare-associated infections (HAIs).
Nurses prevent contamination by strictly adhering to aseptic techniques during procedures like wound dressing, catheter insertion, and administering injections.
Patient safety depends on breaking the chain of infection, which often starts with preventing contamination of sterile equipment and environments.

How to Approach the Question

First, analyze the question stem to identify the key definition being asked. The keywords are 'act of soiling', 'making impure', and 'by contact'.
This is a recall-based question that tests your knowledge of fundamental infection control terminology.
Evaluate each option against the definition.
Sepsis is a systemic response to infection, not the initial contact.
Colonization is the presence of microbes without disease, a state beyond simple contact.
Culture is a lab test.

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 Medicine Harrison 22e Part 1 p. 1188-1190

Practise the full NHM UP Staff Nurse - 2016

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