In infection which is present in an individual but not sufficient to result in a disease is called as?

PGIMS Rohtak NO - 2017

Microbiology

Easy

Appeared in: PGIMS Rohtak NO - 2017

Explanation

A subclinical infection is defined as the presence of an infectious agent in a host without any discernible clinical signs or symptoms.
This type of infection is also referred to as asymptomatic or inapparent.
The pathogen multiplies within the host, but not to an extent that causes observable illness.
Crucially, individuals with subclinical infections can still act as carriers and transmit the disease to susceptible people.
Many common diseases, such as poliomyelitis, hepatitis A, and influenza, have a high proportion of subclinical cases.

Option A: A latent infection involves a pathogen that is dormant or inactive within the host. It is not actively replicating, unlike in a subclinical infection.
Option B: A clinical infection is, by definition, an infection that presents with obvious, observable signs and symptoms of disease, such as fever, rash, or cough. This is the opposite of what the question describes.
Option D: A secondary infection is a new infection that occurs during or after treatment for a primary infection. It is caused by a different pathogen that takes advantage of a weakened immune system.

Clinical Relevance

Nursing practice connection: Knowing Classification of Infections helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding subclinical infections is vital for infection control, as it highlights that disease can be spread by people who appear perfectly healthy.
This principle is the foundation for implementing Standard Precautions for all patients in a healthcare setting, regardless of their diagnosis or perceived infection status.
Public health strategies like screening, contact tracing, and widespread vaccination campaigns are often designed to identify and control the spread from asymptomatic carriers.

How to Approach the Question

First, analyze the key phrase in the question: 'infection... present... but not sufficient to result in a disease.' This means the pathogen is in the body, but the person does not feel or look sick.
Next, evaluate each option against this core definition.
Eliminate 'Clinical infection' because 'clinical' refers to observable signs and symptoms of a disease.
Differentiate between 'Latent' and 'Subclinical'. 'Latent' implies the pathogen is dormant or sleeping. 'Subclinical' (sub = below) means the infection is active but below the threshold of producing clinical symptoms.
Eliminate 'Secondary infection' as this refers to a second, new infection that follows an initial one.
Conclude that 'Subclinical infection' is the term that precisely describes an active infection without symptoms.

Concept Tested & Keywords

Concept Tested: Classification of Infections
Stem keywords: infection, present in an individual, not sufficient to result in a disease
Lead-in keywords: is called as
Negative lead-in flag: false

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 88-90