Health Service Executive officials have stated that the Johnson & Johnson Covid-19 vaccine deliveries are near worst-case estimates.
HSE chief Paul Reid stated that less than 80,000 doses of the vaccine have arrived in Ireland this month.
The pharmaceutical company originally estimated that 470,000 vaccine doses would be delivered but the HSE had warned that the deliveries would range between 235,000 doses and 60,000 doses based on information from J&J.
Up to 70,000 doses are expected to be delivered next month with the use of the vaccine being phased out in the overall rollout.
The single-dose vaccine is to be offered to people over the age of 50 with approximately 150,000 people waiting to take up the offer of a vaccine.
The Oireachtas health committee was told that Ireland is at its peak vaccine supply with over 340,000 vaccines administered last week along with a further 300,000 planned for next week.
Reid predicts that the lead into July will see at least 300,000 vaccines being administered on a weekly basis.
Meanwhile, the cost of the cyber attack on the HSE’s IT systems could rise to half a billion euro, with Reid saying that the immediate cost of the attack has amounted to over €100 million. He added that further long-term clinical and IT costs have not yet been estimated.