The European-wide traffic light travel system to deal with Covid-19 comes into place from this morning with the majority of areas in red.
Greenland is the only area within the green zone, while parts of Greece, Norway, and Finland are in orange, which means arrivals can skip quarantine if they test negative for the virus three days before coming to Ireland.
Every other area is red, meaning they must complete 14-days of isolation, which can only be stopped if there's a negative test five days after coming into a country.
Yesterday officials confirmed 542 new cases in the Republic, and five further deaths.
The estimated national 14-day incidence rate of Covid-19 has fallen to its lowest point in almost a month.
It now stands at 175 cases per 100,000 for the first time since October 12th.
Three counties now have a total of less than 100.