Twelve children in Britain are being treated in hospital after contracting the E. coli bacteria on a visit to a farm in Surrey where visitors pet farm animals.
A total of 36 people had suffered from gastrointestinal illness in the outbreak which was traced to Godstone Farm in Surrey, the Health Protection Agency (HPA) said.
Four of the infected children are said to be seriously ill, according to media reports.
The farm, which allows children to see and touch a variety of animals and attracts up to 2,000 visitors a day, has been closed while a detailed investigation is carried out.
"This is a large outbreak of this infection," said Dr Angela Iversen, Director of the local Health Protection Unit.
"The farm owners are co-operating fully and we are working closely with them and with colleagues across health and local authorities to investigate the source."
The E. coli 0157 bacteria causes diarrhoea and vomiting, but can lead to kidney failure, especially in young children, the HPA said. Officials believe the outbreak began on August 8.
"E. coli 0157 is an infection that people can pick up when handling or stroking animals, unless hands are thoroughly washed afterwards to minimise the risk," Iversen said.
"It can also be spread easily from person to person so good hygiene is vital, especially in young children."
Reuters