Nearly 100 students were given an incorrect dosage of the Pfizer vaccine last week at a school clinic in Montgomery County, Maryland.

Parents began being notified Monday night via telephone. The students received the vaccine at a clinic at South Lake Elementary School in Montgomery Village on Nov. 10., according to a release from the county. The affected children received doses of the Pfizer vaccine that were diluted more than recommended.

A young patient, who was about to receive the first shot of the Pfizer COVID-19 vaccine, picks out a sticker as a reward, Tuesday, Nov. 9, 2021, at the University of Washington Medical Center in Seattle. Last week, U.S. health officials gave the final signoff to Pfizer's kid-size COVID-19 shot, a milestone that opened a major expansion of the nation's vaccination campaign to children as young as 5. (AP Photo/Ted S. Warren) 

A young patient, who was about to receive the first shot of the Pfizer COVID-19 vaccine, picks out a sticker as a reward, Tuesday, Nov. 9, 2021, at the University of Washington Medical Center in Seattle. Last week, U.S. health officials gave the final signoff to Pfizer's kid-size COVID-19 shot, a milestone that opened a major expansion of the nation's vaccination campaign to children as young as 5. (AP Photo/Ted S. Warren) 

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"We apologize for the error, and we are offering another opportunity for the children to be revaccinated," said Dr. James Bridgers, acting County health officer. "We are confident that this is an isolated situation and staff have already received additional training on reconstituting and administering pediatric doses."

The error was discovered Saturday by a staffer who realized their mistake and notified officials. Health officials consulted with the Maryland Department of Health and Pfizer, who recommended that the children receive an additional dose as soon as possible.

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Syringes containing the Pfizer COVID-19 vaccine for children ages 5-11 sit in a tray at a state-run vaccination site in Cranston, R.I., Thursday, Nov. 4, 2021. (AP Photo/David Goldman)

Syringes containing the Pfizer COVID-19 vaccine for children ages 5-11 sit in a tray at a state-run vaccination site in Cranston, R.I., Thursday, Nov. 4, 2021. (AP Photo/David Goldman)

An additional clinic will be held at the school on Wednesday, Nov. 17, for the affected children to get an additional dose. Children not able to attend Wednesday’s clinic are advised to have the vaccination repeated at their earliest convenience. The only students affected were those vaccinated at South Lakes Elementary. 

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Since the pediatric vaccine was approved by the Food and the Drug Administration and Centers for Disease Control and Prevention, more than 11,146 children in this age group have been vaccinated at clinics sponsored by the County and Montgomery County Public Schools. In addition, another 8,061 doses have been administered through local physicians and pharmacies. Montgomery County leads all Maryland jurisdictions in the number of pediatric doses administered.