Capacity of a microbe to cause disease is known as;-

Appeared in: AIIMS Manglagiri NO - 2019

Explanation

Pathogenicity is the term used to describe the ability of a microbial species to produce disease.
It is a qualitative measure, meaning an organism is either classified as pathogenic (can cause disease) or non-pathogenic (cannot cause disease).
This is distinct from virulence, which measures the degree of harm caused by the pathogen.

Option B: Virulence refers to the degree or severity of the disease caused by a pathogen, not its fundamental ability to cause disease. It is a quantitative measure.
Option C: Infection is the process of a microorganism invading and multiplying within a host. An infection does not always lead to disease.
Option D: Immunity is the host's ability to resist infection and disease. It is the opposite of the concept described in the question.

Clinical Relevance

Nursing practice connection: Knowing Definition of Pathogenicity in Microbiology helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Understanding the difference between pathogenicity and virulence is crucial for nurses in infection control. It helps in assessing the risk posed by different microorganisms and implementing appropriate precautions.
This knowledge guides public health strategies, such as vaccination programs, which often use attenuated (less virulent) strains of pathogens to induce immunity without causing severe disease.
A nurse's understanding of these terms helps in patient education, explaining why some infections are more severe than others and the importance of completing prescribed treatments to prevent the spread of virulent strains.

How to Approach the Question

First, analyze the question stem to identify the core concept being asked. The question asks for the term defining the 'capacity...to cause disease'.
Next, evaluate each option based on its precise definition in microbiology.
Pathogenicity is the direct definition of the ability to cause disease.
Virulence is related but refers to the degree of disease, making it a more specific and quantitative term.
Infection is the process of microbial invasion, which may or may not lead to disease.
Immunity is the host's defense, the opposite concept.

Concept Tested & Keywords

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E6 Medicine Davidson Principles Practice 24e p. 124-126

E6 Microbiology Essentials Sastry 4e Part 1 p. 79-81

Practise the full AIIMS Manglagiri NO - 2019

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