The Nanchang educational department confirmed today that the provincial children's hospital has given medical examination to the 120 children.
Among them, 36 children have been hospitalised, 62 put under medical observation and 22 discharged, state-run Xinhua news agency reported.
The children showed symptoms such as vomiting and abdominal pains after they returned home yesterday afternoon.
The municipal health and educational departments are working with the local food and drug authority and police to probe into the incident, the report said.