Some patients at a Wakefield surgery could have been immunised with vaccinations that may not work.
Patients, including young children, at Prospect Surgery, Ossett will have to be revaccinated after it was discovered that vaccines were stored at the wrong temperature for more than seven months.
Vaccines stored at the surgery between Monday, December 4, 2017 and Friday, July 27, 2018 may have been affected.
Among the vaccines affected were the pneumococcal, rotavirus and MenB vaccines, all of which are given to babies.
Some parents told the Express they are concerned for their children, saying they could have been left vulnerable to infection and diseases since December if their vaccines are ineffective.
In a letter to parents, Prospect Surgery said: “While being given a vaccine stored at the wrong temperature is not harmful we cannot be sure that all children vaccinated at the surgery between the above dates are adequately protected against the diseases for which they were vaccinated.
“All vaccines which were stored at the incorrect temperature have been replaced and new fridges and fridge temperature monitors have been purchased.”
A spokesperson for NHS England confirmed that investigations are still ongoing to establish how many vaccinations were affected and how many patients will have to be recalled.
According to the NHS website, Prospect Surgery currently has 8,012 registered patients.
All those affected will be contacted by post.
A spokesperson from NHS England said: “We can confirm that after a routine check at the Prospect Road Surgery in Ossett it was discovered that a batch of vaccinations were not stored at the correct temperature.
“We cannot be sure that vaccine stored at the incorrect temperature has given the patient the required protection against the condition for which they are being vaccinated, therefore, as a precaution we will be writing to all patients affected to invite them to be revaccinated.”