Multiple cases of gastrointestinal illness were reported following the event held by the Royal College of Art in London, the location and date of which have not been disclosed.
Dr Deborah Turbitt, deputy director of PHE London, said: “[We are} looking into this case as a matter of urgency. People feeling unwell should isolate themselves as far as possible, and wash their hands when handling food or using the toilet in order to prevent the spread of infection. Those with diarrhoea or vomiting should take care to drink plenty of fluids to stay hydrated.”
A spokesperson for CH&Co said: “We are aware that Public Health England and Westminster City Council are carrying out investigations into an incident at the RCA and we are actively assisting them in their enquiries in order for them to bring the investigations to a swift conclusion.
“Whilst these investigations are taking place, it would be inappropriate to provide further information at this stage.”