People over 40 are expected to be included in an updated booster programme to be announced this week.
The government's looking to speed up the delivery of third shots due to concern over the Omicron variant.
It's aiming to have 1.5 million third doses administered before Christmas.
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UCC Professor of Immunovirology, Liam Fanning, says a faster rollout of boosters is needed to deal with the Omicron threat:
