SINGAPORE - Nearly 40 people had stomach flu after eating food provided by a Woodlands caterer, with the National Environment Agency (NEA) adjusting the caterer's food hygiene grade to "C" from Thursday (May 24).

In an advisory on its website on Thursday, NEA said 39 people reported having gastroenteritis symptoms after consuming food provided by Tim Delight at 15 Woodlands Loop on March 20 this year.

After NEA conducted investigations, it adjusted the caterer's food hygiene grade and will review it again in 12 months.

Meanwhile, it will keep the premises under surveillance.

According to Tim Delight's website, it is a halal caterer owned by the Gim Tim Group of Restaurants, and has more than a decade of experience in the food and beverage industry.

The Straits Times has contacted the caterer for more information.