The Republic of Ireland's Covid-19 online registration system has opened for people in their fifties, beginning with people aged 59.
People in the 50-59 age bracket will be able to register for the jab over the next 10 days.
It comes as the Cabinet is due to consider the latest advice from the HSE recommending to government that it continues to vaccinate people based on their age.
Health Minister Stephen Donnelly had ordered a review into the rollout of the State vaccination programme after changes to the advice on the use of the four Covid vaccines.
The National Immunisation Advisory Committee (NIAC) has recently recommended that all four vaccines can be administered to people over the age of 50, but only Pfizer and Moderna vaccines should be given to people under 50.
It is understood the HSE has advised the government to continue with its current plan.
It means younger people are unlikely to be immunised ahead, or in tandem, with people from an older age category.
As of May 1, a total of 1,591,888 doses of coronavirus vaccine had been administered in the Republic of Ireland – 1,146,562 first doses and 445,326 second doses.
Meanwhile, the number of people in hospital with coronavirus has increased slightly from 129 yesterday to 144 this morning.
The number of people in ICU with the virus increased by one from 40 yesterday to 41 today.
Yesterday saw 453 positive cases of Covid-19 confirmed in the Republic of Ireland by the Department of Health. No further deaths were recorded.
