Passengers from Britain are being advised to take daily antigen tests for five days after arrival here.
The new advice was issued late last night and comes after the government received an updated public health assessment on the Omicron variant.
There are now six cases here after a further five were confirmed by health officials yesterday.
There are now six confirmed cases of the Omicron variant in Ireland. A number of other probable cases are under investigation.
— Dr Tony Holohan (@CMOIreland) December 9, 2021
The government says any passenger arriving from Britain should take an antigen test on five consecutive days, beginning with the day of arrival and to self-isolate immediately.
Anyone who develops symptoms or has a positive antigen test will then be obliged to take a PCR test.
The government is also urging people to consider their overall health, vaccine status and the spread of Omicron in other countries before deciding to travel.
It also says anyone who is eligible for a booster vaccine should get it if considering international travel soon.