1.3 million doses have been distributed so far, but reports this morning suggested 600,000 of them aren't accounted for.
The HSE says that may be because vaccines which have been sent out haven't been given to patients yet or doctors haven't applied for reimbursement.
CEO Paul Reid has told the Oireachtas Health Committee how the issue has come about:
"There is no missing vaccines, there is always a lag delay between people registering with PCRS for reimbursement; GPs. But we just want to see where the allocation is and how to prioritise the final distribution"
