Limerick, Donegal, Offaly and Dublin have been identified as the counties with the highest Covid incidence rates in the country at the moment.
During a NPHET press briefing this evening Deputy Chief Medical Officer Dr Ronan Glynn highlighted the four counties as areas of concern.
Concerns were raised about the risks that still remain in the country if people do not continue to adhere to public health advice.
At this afternoon's NPHET briefing, Professor Philip Nolan added the "general picture" over recent weeks is one of stability.
Prof Nolan added it was 'good news' that incidence of the virus in most age groups is stable but said there has been a significant increase in infections among young adults aged between 19-24 over the last two weeks.
Following his comments on the scenes of packed crowds in Dublin City Chief Medical Officer Dr Tony Holohan said that it was NPHET''s duty to voice concerns when health guidelines weren't being followed.
However Dr Holohan added that if guidelines are followed the "careful but ambitious path" out of lockdown will be achieved.
Dr Holohan said the scenes on South William Street were like "Jones's Road on the day of an All-Ireland".
When questioned by a reporter about his tweet over the weekend, the Chief Medical Officer said: "Were you there? It was something to behold.
"We anticipated that people would be tempted out by the good weather, but the sheer scale of South William Street. It looked like Jones's Road on the day of an All-Ireland.
"If the council had set about organising an event, they couldn't have squeezed more people in. It'd be the perfect environment for outdoor transmission.
"For us to highlight that wasn't a moral judgement. We have to make judgement in relation to the science about what shapes the transmission of this disease.
The current incidence rate is 122 cases per 100,000 people. In the last 14 days there has been 5,811 new cases of Covid-19 in Ireland.
81% of those cases were in people aged less than 45 with just 2% aged 65 years or older.
