NEW HAVEN, Conn. (WTNH) — New Haven officials announced Friday hundreds of COVID-19 vaccine doses were improperly stored, which may cause it to be less effective against the virus.

Between Dec. 23, 2021, and Feb. 7, 2022, approximately 650 people over the age of 12 received a Pfizer COVID-19 vaccine from the New Haven Department of Health at 54 Meadow St. New Haven Mayor Justin Elicker said the dose experienced a “temperature extrusion” due to improper storage.

“It was maintained at a freezing temperature longer than the recommended period, which can lead to a reduced level of protection against COVID-19,” Elicker said.

Health Director Martiza Bond said they learned of the issue on Tuesday.

Elicker said of the approximately 650 people who received the Pfizer shot from the health department during this period, about three-quarters were receiving booster shots.

After consulting with Pfizer and the Connecticut Department of Public Health, Bond said it was recommended that those who received the improperly stored vaccine or booster get re-vaccinated as soon as they can.

“According to Pfizer, the vaccine doses administered in question could be less effective due to temperature excursion. There is no evidence that temperature excursion has caused medical harm, as this has happened in other places throughout the country, and no health issues have been reported,” city officials said in a press release Friday night.

Officials said the city is reviewing its policies and procedures of vaccine storage and conducting an internal investigation to identify the cause of the temperature extrusion.

If you or someone you know received a Pfizer vaccine at this location in the previously listed time span, you can get an additional dose at the New Haven Health Department Vaccination Clinic at the following times:

  • Monday-Wednesday: 9 a.m. to 5:30 p.m. (Ages 5+)
  • Thursday-Friday: 9 a.m. to 7 p.m. (Ages 5+)

No appointments are needed.

This is a developing story. Check back for updates.