While people aged 18 to 49 are to be offered their choice of vaccine.
The vaccination portal for 30 to 34 year-olds will open towards the end of next week.
The HSE has also confirmed 18 to 49 year olds will have a choice of vaccine.
The official advice is those age groups should be offered an mRNA option - but can go for a dose of AstraZeneca or Johnson & Johnson if they want an earlier vaccination.
Health Minister Stephen Donnelly has said the impact of new NIAC recommendations on the vaccine roll-out are not fully known.
He added it's not clear yet what the impact of the Delta variant will be on hospitalisations:
The HSE has confirmed that 18-49 year olds will have a choice of what vaccine they get.
NIAC is advising that under 50s are still offered an mRNA vaccine by the HSE, however if they want an earlier vaccination they can opt to get an AstraZeneca or Johnson and Johnson jab.
HSE CEO Paul Reid says he's presented a plan to Government on how the latest NIAC advice would be embraced.

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