There's a "clear change" in the way Covid-19 is spreading, with younger people now accounting for the vast majority of cases in this country.
All of the 23 newly-confirmed cases last night were people under 45 years of age, with 15 under the age of 25.
The National Public Health Emergency Team says people need to take immediate care and caution.
Acting Chief Medical Officer, Dr. Ronan Glynn, is appealing to younger people to be sensible if gathering this weekend.
There are now new confirmed cases of Covid-19 in Connacht.
The number of confirmed coronavirus cases in Mayo remains at 572, Galway remains unchanged at 472, Roscommon 346, 146 in Sligo and 82 in Leitrim.