Public Health Wales has urged parents and carers of young children in Barry to take up an offer of free Hepatitis A vaccination after the Vale of Glamorgan town recorded 11 confirmed cases since December 2025.
Targeted campaign to halt community spread
The vaccination clinic will run at Barry Hospital from Tuesday 18 August to Saturday 22 August 2026 and is aimed at children aged five and under who either live in Barry or attend childcare settings there. Those eligible will be contacted by Cardiff and Vale University Health Board by letter or text inviting them to attend.
Public Health Wales said the virus is transmitting within the community but that investigations had not identified a single source for the outbreak. Health officials emphasised the role of young children in onward spread because infections in that age group may occur without obvious symptoms.
"The easiest place for it to spread from is from with young children under the age of six and so if we can vaccinate that age group that will prevent the transmission from those children and stop the spread,"
— Dr Chris Williams, consultant epidemiologist at Public Health Wales.
Why young children are the focus
Hepatitis A is a viral infection of the liver that can be passed between people through close contact and faecal contamination of food or water. Children under six frequently have mild illness or no symptoms but can still shed the virus and infect others, which is why the targeted vaccination effort focuses on that age group.
Clinical presentations can range from asymptomatic infection in toddlers to an acute illness with systemic features. Common symptoms include:
- High temperature and flu-like symptoms (fatigue, headache, muscle aches)
- Nausea and abdominal discomfort
- Dark urine and pale stools
- Jaundice (yellowing of the eyes or skin)
Although most cases in children and otherwise healthy adults are self-limiting, Public Health Wales warned that severe disease can occur in people with underlying health problems, particularly pre-existing liver conditions.
Vaccination as an outbreak control measure
Officials described the vaccine being offered as both safe and effective, noting its routine use as a travel vaccine and in some countries' childhood immunisation programmes. Public Health Wales stated that several hundred people in Barry have already received vaccination as part of local control measures.
Vaccination is a recognised outbreak response tool when direct person-to-person spread is a primary driver, particularly where asymptomatic carriage is common. By increasing immunity in a population subgroup most likely to transmit the virus, health authorities aim to reduce chains of transmission and protect vulnerable contacts.
| Item | Detail |
|---|---|
| Confirmed cases | 11 (since December 2025) |
| Target group | Children aged five and under living in or attending childcare in Barry |
| Clinic dates | 18–22 August 2026 |
Public advice and limitations of current data
Health authorities continue contact tracing and environmental investigations to try to identify any common exposures. At present, officials have not named a single setting or food source linked to all cases. That limitation means the response emphasises broad measures — vaccination for a high-risk transmitting group, hygiene advice and symptom awareness.
Parents and carers were told to expect contact from the health board with an invitation to attend the vaccination clinic. The health board also reiterated basic infection-control measures: rigorous handwashing, careful nappy and toilet hygiene, and staying away from childcare settings while unwell.
Because this account is based on official updates from Public Health Wales and the local health board, it does not seek to quantify secondary transmission beyond the confirmed case count or to attribute cause where the public-health investigation remains ongoing. The effectiveness of the vaccination effort in stopping the outbreak will depend on uptake among eligible children and on identifying any remaining transmission routes.
Parents with concerns about vaccine safety or the clinic arrangements are advised to contact Cardiff and Vale University Health Board or their GP practice for further information.
