PEOPLE who sat within two rows of the person from Northern Ireland infected with Covid-19 on the plane from northern Italy to Dublin have been contacted, health authorities said.
The woman followed advice in reporting concerns to a GP, and "self-isolated" at home whilst awaiting the results of testing.
Health chief Dr John Cuddihy said: "Each of the stages of this person's journey have been identified and all relevant contacts in all of those stages of transport have been contacted (and) traced."
Chief Medical Officer, Dr Tony Holohan, and the head of the Health Protection Surveillance Centre, Dr Cuddihy, held a news conference in Dublin to provide details of Ireland's preparedness.
Dr Holohan said they were depending on an individual with symptoms travelling back from an affected area identifying themselves, contacting the local health authorities, and that was what had happened in this particular case.
Health Minister Simon Harris has met with the environmental health officers at Dublin Airport who are providing information on coronavirus to people flying into the country.
Mr Harris said staff are providing "useful and practical information".
He said: "There's a presence of environmental health officers out here. They are making information available on basic facts you should know as you return to Ireland.
"The feedback from talking to them is this is proving very useful in terms of providing people with the facts, but also reassurance.
"People have lots of questions and they are having an opportunity to ask those questions of those professionals.
"We are also stepping this up and there will be a presence, as appropriate, in all our regional airports from today."
Mr Harris said that public health experts have been working for months to prepare for any cases of Covid-19 in the Republic.