INI-CET EXAM -2025: What is the most frequent cause of viral diarrhea in adults?

INI-CET EXAM -2025

Applied Microbiology & Infection control

Easy

Appeared in: INI-CET EXAM -2025

Explanation

Norovirus, a type of calicivirus, is the most common cause of gastroenteritis outbreaks in older children and adults.
It is known for causing large, explosive outbreaks in semi-closed communities such as schools, hospitals, and cruise ships.
The virus is highly contagious and spreads easily through contaminated food, water, or person-to-person contact.
While other viruses cause gastroenteritis, Norovirus is epidemiologically the most frequent agent responsible for viral diarrhea in the adult population.

Option A: Rotavirus is the single most important cause of severe dehydrating diarrhea in infants and young children (typically 3-24 months old), not adults. Infections in adults are generally less common and often asymptomatic.
Option B: Enteric adenovirus serotypes 40 and 41 are a common cause of viral gastroenteritis, but primarily in infants and children younger than 2 years.
Option D: Astrovirus is a common cause of diarrhea in children and infants but is considered an uncommon pathogen in adults.

Visual 1: Chart - A bar chart comparing the incidence of Norovirus, Rotavirus, Adenovirus, and Astrovirus infections across different age groups (infants, children, adults, elderly) to visually emphasize Norovirus's prevalence in adults.
Visual 2: Infographic - An infographic illustrating the common transmission routes of Norovirus in community settings like cruise ships or hospitals, highlighting fecal-oral spread and contaminated surfaces.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology of viral diarrhea in adults as background academic context rather than a clinical decision trigger.
Identifying Norovirus as the likely cause in an adult outbreak has significant public health implications, guiding infection control measures like hand hygiene, surface disinfection, and isolation of affected individuals to prevent further spread.
Nurses play a crucial role in managing symptoms, primarily dehydration, through oral or intravenous rehydration, and educating patients and families about preventing transmission.
What if? If the patient were a 6-month-old infant with severe dehydrating diarrhea, the most likely causative agent would be Rotavirus, especially if the child is unvaccinated. The clinical management would still focus on rehydration, but the epidemiology is different.

How to Approach the Question

First, identify the key demographic in the question stem: 'adults'.
Next, analyze the core of the question: it asks for the 'most frequent cause' of 'viral diarrhea'.
This is a factual recall question based on epidemiology. Access your knowledge about the common causative agents of gastroenteritis.
Compare the options based on their primary target populations. Recall that Rotavirus is the leading cause in young children.
Recall that Norovirus is famous for causing outbreaks in adults in settings like cruise ships and hospitals.
Conclude that Norovirus is the most frequent cause in adults, while the other options primarily affect children.

Concept Tested & Keywords

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