About 200 students of CHIJ Secondary (Toa Payoh) came down with symptoms of food poisoning, including diarrhoea and abdominal pain, last week.
The source of the contamination has yet to be determined, said the Ministry of Health (MOH), which was notified by the school last Thursday, when students began showing symptoms.
Most of the students who became sick have returned to school and none was hospitalised, said the school’s principal, Mrs Karen Tay, in response to queries from The Sunday Times .
