The Delta Covid-19 variant now accounts for approximately 70% of cases in Ireland.
Dr. Cillian de Gascun said the variant has increased from 55% of cases at the end of last week.
He said the variant will be almost certainly dominant by the middle of July.
Chief Medical Officer Dr. Tony Holohan said the growing incidence of the virus in the country will lead us into another wave.
“Our full expectation is that we’re going to see a significant increase in transmission here. That’s the experience that’s been had across many parts of the UK,” he said.
“So there’s every reason to believe, and that’s our belief, that we’re facing a significant wave of Delta-driven transmission and we’re going to be in the same situation in that respect as we think all of the rest of western Europe is going to experience, maybe at slightly different times.”