The National Immunisation Advisory Committee will meet today to consider whether to rollout the Johnson and Johnson vaccine here.
It's after the European Medicines Agency found a possible link between the Covid-19 jab and very rare blood clots - but said the benefits outweigh the risks.
Ireland's due to receive 600,000 doses of the one-shot vaccine by June, and over 14,000 have already arrived.
Public health expert, Gabriel Scally, believes NIAC will decide to use it on all age-groups - and not just over-60s, like the AstraZeneca jab.
"It seems to have this extraordinary, very very rare side effect, very much similar to AstraZeneca as well.
"They may draw a comparison between the two, even though the data and number of cases is relatively smaller in the Johnson and Johnson vaccine.
"I suspect they'll go with the European Medicines Agency approval."
