Sasikala was suspended by Director of Public Instructions K V Mohankumar as she failed to report the matter of food poisoning, which occurred yesterday, to higher officials on time, they said.
"She was not available over phone throughout the day. She was also not present at the hospitals where the children were admitted," a top official of the education department said.
She also allegedly did not respond to the food safety officials when they inquired about the incident and arrived at the school to collect food samples, the official said.
Meanwhile, hospital sources said most of the hospitalised students were discharged today, while adding that the condition of none of the remaining students was serious and they would be soon discharged.