Before 2013, rotavirus was one of the most common reasons young children were admitted to hospital in the UK. Almost every child contracted it before their fifth birthday. The introduction of routine rotavirus vaccination has changed this significantly, but rotavirus remains an important cause of gastroenteritis in children who are unvaccinated, incompletely vaccinated, or in countries where the vaccine is not routinely given.
Understanding what rotavirus is, how to recognise it, and how to manage it safely is useful for any parent – both because protection from the vaccine is not absolute, and because children visiting or arriving from countries without routine vaccination may not have been immunised.
Healthbooq (healthbooq.com/apps/healthbooq-kids) covers common childhood illnesses and vaccinations.
What Rotavirus Is
Rotavirus is a double-stranded RNA virus in the Reoviridae family. It infects the cells lining the small intestine, impairing their ability to absorb nutrients and water, which produces the characteristic watery diarrhoea. The name comes from the wheel-like appearance of the virus under electron microscopy (Latin: rota = wheel).
Before vaccination, the World Health Organization estimated that rotavirus caused around 215,000 child deaths per year globally, mostly in low and middle-income countries where access to treatment was limited. In the UK, the burden was mainly hospitalisations rather than deaths, but the impact on families and the NHS was substantial. Research by Jim Gray at the UK Health Security Agency (then the Health Protection Agency) and colleagues consistently documented rotavirus as a leading cause of paediatric gastroenteritis in England and Wales before vaccination.
Symptoms and Course
The incubation period is short – typically 1-3 days. The illness begins with vomiting (often abrupt and profuse) followed within 24-48 hours by profuse watery diarrhoea. Fever is common in the first day or two. The diarrhoea is characteristically watery and not usually bloody; bloody diarrhoea in a child should prompt clinical assessment to exclude other causes.
The illness typically lasts 3-8 days. The vomiting usually improves after 2-3 days while the diarrhoea persists. Dehydration is the main risk, and it develops rapidly in young infants because they have a higher proportion of body water relative to weight and less physiological reserve.
Post-vaccination: What Has Changed
The NHS introduced Rotarix (a live attenuated oral vaccine) into the routine infant schedule in July 2013, given at 8 and 12 weeks of age. Studies in England following introduction, including work by Edelstein and colleagues at Public Health England published in The Lancet Infectious Diseases, found a 70% reduction in laboratory-confirmed rotavirus in children under 5, and a substantial reduction in rotavirus-related hospital admissions. The effect extended to unvaccinated children and adults, suggesting significant herd immunity.
The vaccine does not eliminate rotavirus entirely. Vaccinated children can still get rotavirus, though illness is generally milder. The most severe cases of rotavirus gastroenteritis are now concentrated in unvaccinated children.
Management
Oral rehydration solution. ORS (such as Dioralyte) is the cornerstone of management. It replaces not just fluid but the electrolytes lost in profuse diarrhoea. Small, frequent sips – starting with 5-10ml every few minutes – are better tolerated than larger volumes. The aim is to match fluid losses and prevent dehydration from worsening.
Continuing feeds. Breastfed babies should continue breastfeeding throughout the illness; breast milk is not contributing to the diarrhoea and provides hydration and immunity factors. Formula-fed infants should resume normal formula as soon as they can tolerate it; prolonged withholding of formula is no longer recommended. Full feeds can be resumed earlier than previously thought, based on evidence that "gut rest" does not speed recovery.
What not to give. Apple juice, fizzy drinks, and sports drinks are not suitable rehydration fluids for young children; they have the wrong sugar and electrolyte balance and can worsen diarrhoea. Anti-diarrhoeal medications such as loperamide are not recommended in children.
When to Seek Help
Seek urgent assessment if the child shows signs of dehydration: significantly reduced urine output, dry mouth, sunken eyes, no tears, unusual sleepiness, or in infants, a sunken fontanelle. In infants under 3 months, any significant vomiting or diarrhoea should prompt a clinical review. If the diarrhoea is bloody, this is not typical of rotavirus and warrants assessment. If the child is not improving after 7-10 days, or if symptoms are worsening rather than improving, GP review is appropriate.
Key Takeaways
Rotavirus is a highly contagious virus causing vomiting and watery diarrhoea, primarily in children under 5. Before vaccination was introduced, it was responsible for a large proportion of severe gastroenteritis in young children and a significant cause of hospitalisation. The NHS introduced rotavirus vaccination in 2013 as two oral doses in the first year of life, and hospitalisation rates have fallen substantially. In unvaccinated or partially vaccinated children, rotavirus illness can be severe. Management is with oral rehydration solution; severe dehydration may require hospital admission for IV fluids.
