Three mass Covid vaccination centres will be in operation from tomorrow in Dublin, Galway and Portloaise.
They will be used to vaccinate GP teams using the first supply of the Moderna vaccine.
It comes after the HSE announced the period between the first and second doses of the Pfizer vaccine is being extended from 21 to 28 days.
That will take effect for those receiving the jab for the first time from Monday and is aimed at vaccinating more people as new supplies arrive.
Meanwhile, it's emerged Pfizer Bio-N-Tech may be slowing down production of its Covid-19 vaccine.
It is unclear whether this will affect Ireland's allocation of doses.
