Maximum period of infectivity in Mumps is in?

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2016

Microbiology

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2016

Explanation

The period of maximum infectiousness for mumps is from 1-2 days before to 5 days after the onset of parotid swelling.
This window corresponds to the highest concentration of the mumps virus in the saliva, making transmission most likely.
The onset of swelling is the key clinical event that marks this peak period of infectivity.
While viral shedding occurs before and after this point, it is not at its maximum level.

Option A: The incubation period is the time from exposure to the virus until symptoms first appear (12-25 days). For most of this period, the individual is not infectious.
Option C: While a person with mumps remains infectious after the swelling appears, the level of infectivity begins to decline. The peak has already passed.
Option D: The prodromal period (1-2 days of non-specific symptoms before swelling) is part of the infectious window, but it represents the lead-up to the peak, not the peak itself.

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.
Nurses must implement droplet and contact precautions promptly for suspected mumps cases to prevent nosocomial transmission. The isolation period is typically 5 days after the onset of parotitis.
Patient education is key. Nurses should advise patients and their families about the infectious period to limit contact with susceptible individuals, especially pregnant women and the immunocompromised.
What if? A patient is asymptomatic but has been exposed to mumps? Asymptomatic individuals (about 20% of cases) can still transmit the virus. This underscores the critical importance of the MMR vaccine for community-wide immunity, as it is the most effective way to prevent both symptomatic and asymptomatic spread.

How to Approach the Question

First, identify the keywords in the question: 'Maximum period' and 'infectivity' in 'Mumps'. This signals that you need to know the specific time of peak contagiousness, not just any time the person is infectious.
Recall the typical stages of a viral illness: incubation, prodromal (early symptoms), acute illness (characteristic symptoms), and convalescence (recovery).
For mumps, the characteristic symptom is parotitis (swelling of the salivary glands).
Consider when viral shedding is likely to be highest. For many respiratory viruses, this coincides with the peak of symptoms.
Evaluate the options in this context: The 'Incubation period' is too early. 'After swelling' is too late for the peak. The 'Prodromal period' is infectious, but the 'Onset of swelling' marks the height of the illness and thus the peak of viral shedding.
Therefore, select 'Onset of swelling' as the most precise answer for the period of maximum infectivity.

Concept Tested & Keywords

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

E6 Medicine Harrison 22e Part 1 p. 1688-1690