The incident took place yesterday afternoon at the primary school run by Tribal Welfare Department in Sisila village panchayat near Ambikapur town.
According to local officials, after the food was served to teachers and students, headmistress Kamla Korva noticed smell of some medicine while eating vegetables and immediately asked the staff not to give it to children, but by then some students had already ate it.
Aftersometime, the condition of Korva deteriorated. Eighteen children also complained of vomiting and nausea, following which they all were rushed to Batoli community health centre.
Irregularities in mid-day meal will not be tolerated and stern action will be taken against those found guilty, he said.
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Sonbhadra Self Help Group was tasked with cooking the mid-day meal at the school.
Local officials claimed that the smell in the vegetables could be due to excess spraying of pesticide, but only a probe can confirm it.