Whooping cough is most infectious during the stage of?

RUHS, Jaipur, PB B.Sc Nursing Entrance-2018

Medical & Surgical Nursing

Easy

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2018

Explanation

The catarrhal stage is the most infectious period of whooping cough.
This stage lasts for 1-2 weeks and is characterized by non-specific, cold-like symptoms such as coryza (runny nose), mild cough, and low-grade fever.
The bacterial load of Bordetella pertussis in the nasopharynx is highest during this phase, making the individual highly contagious.
Because the symptoms are mild and resemble a common cold, the infected person often spreads the disease unknowingly.

Option B: During the paroxysmal stage, infectivity is decreasing. This stage is defined by the characteristic severe coughing fits ('paroxysms') and the inspiratory 'whoop,' which appear after the period of peak contagion.
Option C: The convalescent stage is the recovery phase, where the cough and other symptoms gradually subside. The individual is generally no longer considered infectious.
Option D: The recovery stage is synonymous with the convalescent stage. During this time, the body is clearing the infection, and the person is not infectious.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infectivity of Pertussis (Whooping Cough) Stages as background academic context rather than a clinical decision trigger.
Early diagnosis during the catarrhal stage is crucial for starting antibiotic treatment, which can reduce the severity of the illness and, more importantly, shorten the period of communicability to just 5 days.
Nurses must implement droplet precautions immediately for suspected cases to prevent nosocomial spread, especially to vulnerable populations like infants and immunocompromised patients.
Public health reporting is mandatory for pertussis. This allows for contact tracing and administration of post-exposure prophylaxis to close contacts, breaking the chain of transmission.

How to Approach the Question

First, identify the keywords in the question: 'Whooping cough' and 'most infectious stage'.
Recall the clinical course of pertussis, which is divided into three distinct stages: catarrhal, paroxysmal, and convalescent.
Associate the level of infectivity with each stage. Remember that infectivity is highest when the bacterial load is at its peak.
Recognize that the initial, cold-like (catarrhal) stage is when the bacteria are multiplying rapidly in the respiratory tract, making this the most contagious period.
Contrast this with the paroxysmal stage, where the classic 'whoop' appears but infectivity has already begun to decline.
Select the catarrhal stage as the correct answer.

Concept Tested & Keywords

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