More than 200 children and teens have been unknowingly put at risk of serious illnesses like measles, meningitis and Hepatitis B after receiving inadequate vaccines.
The HSE has confirmed that 221 young patients who were treated by a single GP in Newcastle, west Dublin, since the late 1990s have been affected in the error.
According to a spokesperson, while the drugs used in these vaccinations were fine, there were unstated problems in how the jabs were administered.
As such, the children may not have been immune to the illnesses, which can cause serious ill-health and in some cases death.
The HSE said there was no safety issue with the situation.
However, it added that all patients involved were being called to special clinics to undergo repeat vaccinations in an attempt to prevent any child from developing the illnesses.
Families affected by the callback alert will receive a letter with a freephone information number attached should they have any further concerns.
Health service officials launched an investigation into what happened after being contacted by a concerned parent, and sought further help from the National Immunisation Advisory Committee.
Manufacturers of the drugs are not believed to be at risk of any difficulties as a result of the error.
This is because they can only stand over the quality of their drugs provided they are administered under Irish Medicines Board and European Medicines Agency standards.
The conditions involved in the error are part of HSE child vaccine programmes due to the serious risk they pose.
© Irish Examiner Ltd. All rights reserved