Around 250 people are suspected to have contracted salmonella, following a food festival in Newcastle.
Eight cases have been confirmed. The outbreak began after the Street Spice event which took place in the city between 28 February and 2 March.
The authorities are working with the businesses which ran thirteen separate stalls to try to identify the source.
Those suspected of picking up the bacteria have reported flu-like symptoms and stomach pain.
More top news
Kerrie brings you Sunday night's forecast
Clear weather develops overnight into Monday. Cold days and frosty nights. Mainly dry inland - but a wintry risk continuing in the east
Icy first thing and windy, with wintry showers lingering further south, especially at the coast. Brighter elsehwere