Dr Tony Holohan has warned that anyone who tests positive for Covid from here on in will be isolating for Christmas.
It comes as a further 4,235 cases were confirmed in Ireland on Wednesday.
And NPHET is expected to recommend new restrictions after meeting on Thursday.
Dr Tony Holohan, Chief Medical Officer, said on Wednesday: “Today marks 10 days before Christmas. If you contract Covid-19 today your isolation period will include Christmas Day. This can be avoided by ensuring you take every step possible to protect yourself.
“If you are planning to spend Christmas with older family members, anyone immunocompromised or vulnerable to the effects of Covid-19, it is best that you take precautions from today. Avoid crowds, limit your contacts, work from home unless absolutely necessary, risk assess your environments and make safe choices over the coming days and weeks.
“Everyone should be aware that Omicron spreads very easily and we have now identified community transmission in Ireland, to the extent that this variant accounts for approximately 13% of all reported cases.
“Taking the opportunity to get a booster dose of vaccination is as vital today as getting the first dose was earlier this year. You will begin to receive the benefit of your booster protection within seven days of receiving your third dose.”
The CMO has also listed the following pieces of advice for avoiding Covid;
- Practice social distancing
- Work from home, where possible
- Avoid crowds
- Ensure indoor spaces and public transport are ventilated (open windows)
- Hand and respiratory hygiene
- Use face masks
- Stay at home and isolate if you experience symptoms
