HSE calls for eligible people to come forward.
The HSE says up to half a million people who are re eligible for a booster vaccine have yet to come forward.
More than 2.6 million doses have so far been administered, with around 25,000 given out in the week up to Thursday.
A number of walk-in clinics are open this weekend, while people can also book an appointment or visit a pharmacy or GP.
Head of the HSE's Vaccination Programme, Damien McCallion, says it's important people come forward for their booster:

Five Hospitalised After Arson Attack In Finglas
Gardaí Warn Drivers After 150 Caught Drink or Drug Driving Over Christmas Period
An Garda Síochána Release Image of Getaway Car Found Burnt Out In Naas Used In Fatal Offaly House Fire
Pedestrian Dies After Collision On R445 Monasterevin Road Outside Kildare Town
Fine Gael TD Calls For Restricted Bin Collection Times To Ease Traffic Delays
Gardaí Continue Their Road Traffic Enforcement Operation Throughout The Christmas Period
New Quality Mark To Be Introduced To Crack Down On Bogus English Language Schools
Concerns Rise As Organ Transplant Operations Decline