JOHANNESBURG - Eastern Cape Health is probing how over 300 pupils from a KwaBhaca High School were poisoned.
They were rushed to healthcare facilities, vomiting and with diarrhoea.
The health department is investigating the source of the illness and is awaiting test results.
READ: Over 300 EC students rushed to hospital after falling ill at school
Eastern Cape Health spokesperson, Sizwe Kupelo, said they are looking at a food or waterborne disease.
"Samples have been taken to laboratories to establish the cause of the illness," he said.
He said the majority of the pupils were treated and discharged and three remain in hospital.
"I'm sure by tomorrow [Monday] they'll be discharged as well."
EC pupils treated for diarrhea 2
EC pupils treated for diarrhea 3
EC pupils treated for diarrhea 4
EC pupils treated for diarrhea 5