Norovirus, a contagious RNA virus belonging to the Caliciviridae family, is one of the most common causes of gastroenteritis, a digestive system illness characterized by nausea, vomiting, and severe diarrhea. This virus, capable of affecting individuals of all ages, was first identified in an Ohio school in 1968 and can cause outbreaks throughout the year, irrespective of season.
As an RNA virus, norovirus possesses a rapid mutation capability, allowing it to evolve into different antigenic types. This characteristic can lead to individuals experiencing multiple infections. The virus has the potential to spread rapidly in confined and crowded environments such as schools, hospitals, restaurants, daycares, public transport, and shopping centers, affecting large populations.
Norovirus typically spreads through contaminated food and water; it also readily disseminates via contact with infected surfaces or close contact with infected individuals. Symptoms appear within 12 to 48 hours following infection and manifest as acute gastroenteritis. In adults, these symptoms usually involve the sudden onset of diarrhea and vomiting. Severe cases may necessitate hospitalization. Viral shedding in stool can persist for up to 6 weeks even after clinical recovery, indicating continued contagiousness. The recovery period varies depending on the individual's overall health and immune resistance.