Children and staff at two schools and two nurseries in Portsmouth will be vaccinated against Hepatitis A after a cluster of cases in the city.
The disease, which is often associated with foreign travel, can cause flu-like symptoms, jaundice, and vomiting.
Children at Isambard Brunel Juniors, Meredith Infant and Pre-school, and Izzies Nursery School -which are all on the same site - have been offered the treatment.
Public Health England says the move is a 'precautionary measure.'
ITV Meridian spoke to Iain Gilmour, Headteacher at Isambard Brunel Junior School: