Hartford Healthcare Medical Group said that more than 5,000 doses of vaccines it administered since last year may not have been stored under the proper temperature.
The medical group said patients who received the shots are not at risk of harm, but it believes the temperatures may have reduced the effectiveness of the vaccines, which were mainly for influenza, pneumonia and tetanus/pertussis.
The 5,003 shots were given to 3,833 patients at locations in Enfield, West Hartford, Storrs and Unionville.
The medical group is reaching out to affected patients and recommending they be revaccinated at no charge.
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