People who visited the Street Spice food festival in Newcastle are being asked to fill out an online questionnaire after hundreds of people reported symptoms of food poisoning.
Environmental Health Officers are continuing to investigate and are talking to businesses and suppliers to try to identify the source of the outbreak, with results expected to be released this week.
12,000 people are thought to have visited the food festival while it was in the city.
Anyone who attended the event, whether they have been ill or not, are being advised to complete a confidential online questionnaire, available at http://tinyurl.com/streetspice.
More top news
MPs are to vote on whether the UK will become the first country in the world to legalise babies with three biological parents.
The wintry weather continues - but is there anymore snow on the way?
Police in York are appealing for help to find a 15-year-old boy who has been reported missing and is in 'an emotional frame of mind'.