“Patient safety is our first priority, and we are confident our quality-control standards ensure the safety of all influenza vaccines made available for patients,” he wrote.

The vaccine is manufactured by ID Biomedical Corp. of Quebec, he said, and comes in 5-milliliter vials — enough for 10 doses. The vial at Shenandoah Valley was almost full when it should have been half-empty, Tandy said.

Passanante said both teachers thought that Peugh handled their symptoms professionally. When she did not return to school, he said, teachers were told that she was upset.

Passanante said Seibel and Vent “are having very serious emotional issues as a result of this and suffering both anxiety and depression. Further, their inability to get answers to their question is causing them extreme frustration.”

Passanante complained that the school district had balked at providing information necessary to determine how the mistake happened. He believes that either the school nurse mixed up the vials or the vaccine was contaminated.

The district wants an independent test of the vial used for the five doses at Shenandoah Valley that day. An EMT took the vial to St. Luke’s with the teacher, and officials there sent it to the manufacturer.