What are the symptoms of norovirus
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Symptoms of Norovirus Infection
Sudden Onset of Gastrointestinal Symptoms
Norovirus infection is primarily characterized by a sudden onset of gastrointestinal symptoms. The most common symptoms include diarrhea and vomiting, which can appear rapidly and without warning Telfer2004Zelner2013. These symptoms typically begin 12 to 36 hours after exposure to the virus and usually resolve within 72 hours .
Additional Common Symptoms
In addition to diarrhea and vomiting, individuals infected with norovirus often experience a range of other symptoms. These can include nausea, abdominal discomfort, lethargy, headache, anorexia, and fever Telfer2004Goller2004. These symptoms can vary in intensity and duration, with some individuals experiencing more severe manifestations that may require hospitalization .
Symptoms in Specific Populations
Elderly Individuals
In elderly populations, norovirus can cause both acute and non-specific symptoms. While acute symptoms like diarrhea and vomiting typically resolve within a few days, non-specific symptoms such as headache, thirst, and vertigo can persist for up to 19 days . This prolonged symptomatology necessitates careful management and monitoring in aged-care facilities .
Immunocompromised Patients
For immunocompromised individuals, such as renal transplant recipients and pediatric cancer patients, norovirus infection can lead to chronic symptoms. These patients may experience prolonged episodes of diarrhea, weight loss, and abdominal discomfort, with viral shedding continuing for several months Westhoff2008Ludwig2008. The severity of symptoms in these patients often correlates with high viral loads in their stool .
Pediatric Patients
In children, norovirus infection can sometimes lead to convulsive disorders, particularly in young infants. This is a notable complication that distinguishes norovirus from other causes of gastroenteritis like rotavirus . Despite the occurrence of convulsions, long-term neurological sequelae are uncommon .
Vomiting and Transmission Risk
Vomiting is a significant symptom of norovirus infection and plays a crucial role in the transmission of the virus. Studies have shown that vomiting can lead to substantial environmental contamination, increasing the risk of transmission through fomites and airborne droplets Kirby2016Hagbom2021. The presence of high viral titers in emesis further underscores the importance of effective infection control measures to prevent outbreaks .
Conclusion
Norovirus infection presents with a range of symptoms, primarily affecting the gastrointestinal system with sudden onset diarrhea and vomiting. Additional symptoms such as nausea, abdominal discomfort, and fever are common, with specific populations like the elderly and immunocompromised individuals experiencing more prolonged and severe symptoms. Vomiting not only serves as a key symptom but also significantly contributes to the transmission of the virus, highlighting the need for stringent infection control practices. Understanding these symptoms and their implications is crucial for managing and preventing norovirus outbreaks effectively.
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Most relevant research papers on this topic
A large outbreak of norovirus gastroenteritis linked to a catering company, New South Wales, October 2003.
Noroviruses cause large outbreaks of gastrointestinal disease in humans, with symptoms typically starting 12–36 hours after infection and resolving within 72 hours.
Chronic norovirus infection in renal transplant recipients.
Norovirus can cause both asymptomatic and symptomatic chronic infection in renal transplant recipients, with virus elimination requiring reduced immunosuppression in symptomatic cases.
DOI
Replication in Human Intestinal Enteroids of Infectious Norovirus from Vomit Samples
Infectious norovirus can be detected in 25% of vomit samples, with a 13-fold to 714-fold increase in genomic equivalents, confirming its presence in human intestinal enteroids.
Norovirus infection as a cause of diarrhea-associated benign infantile seizures.
Norovirus infection is a major cause of acute gastroenteritis in children and can cause convulsive disorders, particularly in young infants, but long-term neurological sequelae are uncommon.
DOI