**** What is the most frequent cause of viral diarrhea in adults?

Appeared in: AIIMS Raipur NO- 2019 (shift 3rd)

Explanation

Norovirus, a type of calicivirus, is the leading cause of acute gastroenteritis and diarrhea outbreaks in adults.
It is known for causing large, explosive outbreaks in settings with close person-to-person contact, such as hospitals, cruise ships, and schools.
The illness typically has a short incubation period and is characterized by nausea, vomiting, watery diarrhea, and abdominal cramps.
While other viruses cause diarrhea, Norovirus is epidemiologically the most frequent causative agent in the adult demographic.

Option A: Rotavirus is the single most important cause of severe dehydrating diarrhea in infants and young children, not adults.
Option B: Enteric adenovirus (serotypes 40 and 41) primarily causes gastroenteritis in children younger than 2 years.
Option D: Astrovirus is a common cause of diarrhea in young children but is described as an uncommon pathogen in adults.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain The epidemiological causes of viral diarrhea, specifically identifying the most common agent in the adult population as background academic context rather than a clinical decision trigger.
Nurses must be able to identify likely pathogens based on patient demographics (like age) to implement appropriate infection control measures, especially in outbreak situations.
Recognizing Norovirus as a likely cause in an adult with acute gastroenteritis prompts immediate implementation of contact and droplet precautions to prevent nosocomial spread, as it is highly contagious.
Patient education is crucial. Nurses should instruct on proper hand hygiene (soap and water are more effective than alcohol-based sanitizers for Norovirus), hydration, and cleaning contaminated surfaces to limit transmission.

How to Approach the Question

First, identify the core of the question: it asks for the 'most frequent' cause of a specific condition ('viral diarrhea') in a specific population ('adults').
Analyze the keywords: 'most frequent' indicates a question about epidemiology and prevalence. 'Adults' is the critical demographic clue.
Evaluate each option based on your knowledge of infectious diseases and their target populations.
Recall or deduce that Rotavirus is the leading cause in children, making it less likely for adults.
Consider Norovirus, often associated with outbreaks on cruise ships and in other community settings, which predominantly affect adults.
Eliminate Adenovirus and Astrovirus as they are also primarily pediatric pathogens.

Concept Tested & Keywords

Concept Tested: The epidemiological causes of viral diarrhea, specifically identifying the most common agent in the adult population.
Stem keywords: viral diarrhea, adults, most frequent cause
Lead-in keywords: What is
Clinical cues: The patient population is specified as 'adults', which is the key to differentiating between the options.

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 pp. 2056-2058, 2057-2059

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