Those with underlying conditions will be moved up the Covid-19 vaccination priority list.
The Government has accepted the advice from NIAC which includes moving those aged 16 to 69 who are very high risk, such as some cancer patients, from seventh to fourth on the list, just after the over 70s.
Cystic Fibrosis Ireland's calling on the government to clarify its decision to move some sufferers up the vaccine priority list, but leave others.
Cohort 5 now includes high-risk 65 to 69-year-olds, Cohort 6 is the remainder of that age group, and Cohort 7 is 16 to 64-year-olds who're high risk.
CEO of Cystic Fibrosis Ireland, Philip Watt, says all CF sufferers should be considered high risk.
Meanwhile, the Taoiseach has confirmed plans to have up to 82 percent of adults given their first vaccination by the end of June.
But the timeline could be derailed by a further under delivery from AstraZeneca for the second quarter this year.