Maximum infectivity of mumps is during:

AIIMS Delhi NO-2016

Applied Microbiology & Infection control (E5)

Easy

Appeared in: AIIMS Delhi NO-2016

Explanation

Mumps is a viral illness caused by a paramyxovirus, transmitted via respiratory droplets.
The period of maximum infectivity is 1-2 days before the onset of parotitis (salivary gland swelling) and continues for up to 5 days after.
This 1-2 day period before the classic swelling is known as the prodromal phase, which is characterized by non-specific symptoms like fever, headache, and malaise.
During the prodromal phase, the virus is actively shedding in saliva at peak levels, making it the time of highest transmission risk, often before the individual is aware they have mumps.

Option B: The incubation period is the time from exposure to the first symptom. For most of this period (12-25 days), the person is not infectious. Infectivity only begins at the very end of this stage, just before the prodromal phase.
Option C: While a person is still infectious after the swelling appears, the viral shedding and risk of transmission have already begun to decline from their peak, which occurred just before and at the onset of swelling.
Option D: By the time the swelling has disappeared, the individual is typically no longer infectious. The recommended isolation period is usually 5 days after the onset of swelling.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Period of maximum infectivity for mumps as background academic context rather than a clinical decision trigger.
Understanding the period of maximum infectivity is crucial for public health and infection control. Because mumps is most contagious before the characteristic swelling appears, it can spread easily in communities, especially among unvaccinated individuals.
Nursing interventions focus on isolation (droplet precautions) for 5 days after the onset of parotitis to prevent further spread. This is a key recommendation from the CDC.
What if? If a patient presents with fever and malaise but no swelling, and has been in contact with a known mumps case, the nurse should suspect potential mumps, implement droplet precautions immediately, and not wait for parotitis to develop, as the patient is likely in the most infectious stage.

How to Approach the Question

First, identify the core of the question: it asks for the period of maximum infectivity of mumps.
Recall the typical stages of a viral infection: incubation, prodromal (early symptoms), acute illness (characteristic signs), and recovery.
Analyze each option in the context of these stages.
Differentiate between being 'infectious' and being at 'maximum infectivity'. A person can be infectious for a long period, but the peak is usually a shorter window.
Remember that for many respiratory viruses, including mumps, peak viral shedding often occurs just before or as the most obvious symptoms begin. This makes the prodromal period a likely candidate for maximum infectivity.
Select the option that corresponds to the period of highest viral shedding, which is the prodromal phase.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1974-1976

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