The measure had been delayed.
A measure that was due to come in yesterday will now be in place from midnight tonight.
The Government delayed the measure that everyone coming into the country will need a negative covid-19 test by 48 hours.
It will now be in place from midnight tonight.
We'll have to either take a PCR or professionally taken antigen test.
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The measures are being brought in on the back of the emergence of the new Omicron variant.
Here's the breakdown of how it'll work:
There will be checks pre-departure for proof of a negative COVID-19 test result.
People may also be subject to checks on arrival.
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People who arrive without a negative test result will need to home quarantine and take a PCR test within 36 hours of arrival.
A passenger with proof of vaccination or recovery can show either a negative PCR test result taken within 72 hours of arrival or, a negative antigen test result taken within 48 hours of arrival.
It comes after air passengers expressed annoyance about spending hundreds of euro on Covid-19 tests, that weren't required yesterday morning.
Yesterday Justice Minister, Helen McEntee, said the delay was as a result of regulations not being signed soon enough and that it wasn't intentional.