There have been 1,015 new cases of coronavirus in Ireland.
The latest available figures show there are 178 patients in hospital with the virus - 29 of these are in ICU.
Chief Medical Officer Dr Tony Holohan has thanked younger people for getting vaccinated at the weekend.
He says: "Public health doctors around the country are reporting that outbreaks are being notified to them that originated in symptomatic people attending workplaces, or eating out, or visiting friends.
"Please remember that you should stay at home if you have symptoms even if you are vaccinated, because you could still transmit COVID-19.
"Together as a country, we need to keep on top of all the positive behaviours that limit the spread of disease, and integral to this is staying at home if you have any cold or flu symptoms.
"Don't drop your guard, because heading into work or meeting a friend while experiencing fever, cough, cold/flu symptoms, or loss of sense of smell/taste – that could be the beginning link that sets off a chain of transmission that leads to an outbreak in your community.
"The uplifting scenes we saw over the bank holiday weekend as thousands of our young people received their COVID-19 vaccines at the HSE's walk-in vaccination centres were extremely encouraging.
"Young people have had an exceptionally difficult time throughout the COVID-19 pandemic.
"Their willingness to come out to get vaccinated in droves is another example of the resilience they have shown throughout this challenging time.
"It is this same spirit of solidarity, commitment to keeping our whole community safe by getting vaccinated, and keeping to the basic safe measures such as staying at home if you feel unwell that will ultimately be our pathway out of this pandemic."
He was speaking after figures suggest more than 30,000 people received a jab at walk-in vaccination centres over the long weekend - predominantly younger people.
While Ireland has completed a deal to secure 700,000 COVID-19 vaccines from Romania.
Taoiseach Micheál Martin has described it as 'fantastic news' and a welcome boost to the vaccine rollout programme.
The deal to purchase the extra Pfizer/BioNtech doses has cleared the EU process, he says.
Announcing the additional supply, Mr Martin says: "This is a welcome boost to our ongoing and very effective national vaccination programme.
"As deliveries arrive this month, they will be used to meet the continued high uptake of our COVID vaccines.
"These new Pfizer vaccines will ensure supply as we continue the next phases of the rollout over the summer and autumn months.
"I want to thank Romania and the EU for their assistance and show of solidarity to Ireland as we further protect our citizens in this pandemic."