Quick read
Key points
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Norovirus, often called the 'winter vomiting bug', is a highly contagious virus that causes sudden vomiting and diarrhoea. It spreads easily through contaminated food, surfaces, or close contact with an infected person, and outbreaks are common in places like schools, care homes, and hospitals.
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Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
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Signs of dehydration such as reduced urination, dizziness, or a dry mouth appear
01 · Know
What is Norovirus?
Norovirus, often called the 'winter vomiting bug', is a highly contagious virus that causes sudden vomiting and diarrhoea. It spreads easily through contaminated food, surfaces, or close contact with an infected person, and outbreaks are common in places like schools, care homes, and hospitals.
Symptoms usually start suddenly and last one to three days, though you can feel quite unwell during that time. Most people recover fully at home without needing medical treatment.
02 · Understand
Clinical context
Self-care advice
There's no specific treatment for norovirus — antibiotics don't work against it, as it's a virus, not a bacterial infection.
03 · Act
When to see a doctor
- 1Signs of dehydration such as reduced urination, dizziness, or a dry mouth appear
- 2Symptoms last longer than three days without improvement
- 3There is blood in vomit or stool
- 4A baby, young child, elderly person, or someone with a weakened immune system is affected
- 5You're unable to keep any fluids down at all
04 · Prevent & manage
Practical steps
Take these self-care steps
These measures can help ease symptoms, support recovery, and reduce the chance of things worsening — but they don't replace medical advice if symptoms are severe or persistent.
- 1Stay hydrated.Take small, frequent sips of water or oral rehydration solution to replace fluids lost through vomiting and diarrhoea.
- 2Rest until symptoms pass.Avoid work, school, or childcare until at least 48 hours after your last episode of vomiting or diarrhoea.
- 3Practise careful hygiene.Wash your hands thoroughly with soap and water — alcohol gel is less effective against norovirus.
- 4Disinfect surfaces and wash laundry on a hot wash.This helps prevent the virus spreading to others in your household.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: Norovirus ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Norovirus is unpleasant but usually short-lived. Staying hydrated and practising good hygiene are the most important things you can do.
Avoid preparing food for others and stay away from school or work until 48 hours after symptoms have fully stopped.