There have been 334 new coronavirus cases confirmed in the Republic.
No further deaths have been reported.
The number of cases since the pandemic began now stands at 33,444.
Of today's cases, 55 have been identified as community transmission.
174 cases were identified in Dublin, 34 in Cork, 30 in Kildare, 18 in Donegal, 10 in Galway, 10 in Louth, six in Clare, six in Mayo, six in Meath, six in Roscommon, six in Waterford, five in Limerick, with the remaining 23 spread across 11 counties.
Acting Chief Medical Officer said people aged 15-34 now account for 40% of cases in the past two months, despite accounting for just a quarter of the population.
He said: "This is not surprising as they are more likely to be moving about in the community, going to school, higher education or work, and keeping our economy and key services going.
“For teenagers and people in their 20s and 30s in particular, I know that what has been, and is being asked of you again is extraordinary.
“But the disease is continuing to spread disproportionately among younger people at present. And so, I am asking you to stick with this and continue to follow the public health advice."
Latest figures show the national incidence rate of COVID-19 stands at 70.4 per 100,000 population - with particular concern over counties such as Donegal, Dublin, Louth and Waterford.
Today's figures also show 94 COVID-19 cases in Irish hospitals - up four compared to yesterday - and 16 in ICU.
The numbers in hospital are now at their highest since early June.
