The recommended period for isolation for measles is?

DSSSB -28 August 2019 (Shift-2)

Applied Microbiology & Infection control

Easy

Appeared in: DSSSB -28 August 2019 (Shift-2)

Explanation

The period of communicability for measles is from approximately 4 days before to 4-5 days after the appearance of the rash.
The catarrhal stage (prodrome) is the initial phase of symptoms before the rash and is part of the infectious period.
Isolation is recommended from the onset of these first symptoms (catarrhal stage) until the 7th day after the rash appears.
This 7-day post-rash period provides a safety margin to prevent transmission, as communicability declines rapidly after the rash appears but doesn't cease immediately.
This comprehensive duration covers the entire infectious window effectively.

Option A: This isolation period is too short. A person with measles is still infectious on the 3rd day of the rash and can transmit the virus.
Option B: This duration is longer than the standard recommendation for immunocompetent individuals. The period of communicability typically ends by the 5th day of the rash.
Option C: This is an excessively long isolation period that far exceeds the known infectious window for measles. It is not a standard public health recommendation.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infection control and isolation precautions for measles as background academic context rather than a clinical decision trigger.
Nurses must implement strict airborne precautions for patients with suspected or confirmed measles. This includes placing the patient in a negative-pressure room, wearing an N95 respirator, and ensuring hand hygiene.
Patient and family education is critical. The nurse must explain the reason for isolation, the duration, and how to prevent spread to others.
Public health notification is a mandatory step. Measles is a notifiable disease, and prompt reporting allows for contact tracing and post-exposure prophylaxis for susceptible individuals.

How to Approach the Question

First, identify the core of the question: it asks for the standard isolation period for measles.
Recall the key phases of measles: the prodromal (catarrhal) stage and the eruptive (rash) stage.
Remember the rule for measles communicability: it starts before the rash is visible (during the catarrhal stage) and continues for several days after the rash appears.
Evaluate the options based on this rule. The correct option must cover the period both before and after the rash onset.
Option A is too short. Option B and C are too long for a standard case.
Select the option that aligns with the standard public health guideline, which is typically 4 days before to 4-5 days after the rash, with isolation often extended to 7 days post-rash for safety.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart A (pp 26-201 of 604) p. 150-152