How exactly it happened was not immediately known.
Officials said the Health Department has trained all nurses to follow a protocol for confirming parental consent and reviewing each child's health screening information before vaccine is administered.
"These children have had no adverse effects and the Health Department does not expect any future adverse medical effects for these children, but we are working to determine how this misstep occurred, and we will develop additional safeguards to prevent similar instances in the future," the Department of Education said.
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