Farm day visitors warned over Cryptosporidium parasite threat23 hours ago Share Save Malcolm Prior and Jenny Kumah • @NewsMPrior Rural affairs team Share SaveMalcolm Prior/BBC Emily Fryer's family visited a farm before her youngest son fell ill and had to be admitted to hospitalTens of thousands of visitors due to attend a UK-wide open farm day this weekend have been warned about a parasitic infection that causes serious gastrointestinal illness. The organisers of Open Farm Sunday, which sees 190,000 visitors, said its farms have high health and safety standards. Public Health Wales said individual cases of cryptosporidiosis linked to visits to Cowbridge Farm Shop at Marlborough Grange Farm in Cowbridge, Vale of Glamorgan, this spring had now risen to 89 people. In England, one of those affected after a farm visit was Emily Fryer's six-year-old son Isaac. Mrs Fryer said she was disappointed that the farm had been allowed to reopen to visitors.