Immunisation clinics planned for today using the AstraZeneca vaccine have been cancelled by the Health Service Executive, due to changes in the advice on the use of the product.
The HSE advised hospital groups and Community Healthcare Organisations of its decision yesterday.
Arrangements will be made in due course to rearrange appointments.
The HSE is now assessing the impact of a decision by the National Immunisation Advisory Committee (NIAC) recommending that the AstraZeneca vaccine be limited to people over 60 years of age.
Thousands of AstraZeneca vaccinations were planned for today.
An update will be given by the HSE in the coming days.