25 to 29 year olds can register for a Pfizer or Moderna vaccine from today.
The HSE's portal is now open to the cohort, however people in this age group can still register with a pharmacy for a Janssen vaccine.
Registration can be done online or over the phone, with appointments to be arranged in the coming weeks.
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Beaumont Hospital Consultant, Professor Bill Tormey, says getting younger people vaccinated quickly will be vital due to the Delta variant.