The head of the Covid vaccine taskforce says it's "impossible" to say what per cent of the population will be vaccinated by the end of June.

The government's target of giving 82 per cent of adults a first dose by then is unlikely to be met because of shortfalls from Johnson & Johnson.

Brian McCraith has told the Business Post there are too many factors still at play - like how much of the single shot vaccine arrives.

Professor of immunology at Trinity College Dublin, Kingston Mills, says there'll be a need to ensure everyone is protected:

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