Dr. Cillian De Gascun:

In the case of pre-departure testing with a PCR test, it is probably useful in identifying people who are infected at that point in time and stopping them travelling. That is what one can do. The incubation period of the virus is 14 days so probably from day four to day five today - day ten to day 12 - they are the people we are stopping travelling. The problem is that we have got people in the first four days of the four to five days of their infection so we will miss them. It is not that they will have a false sense of security. They will have been given an RNA detected test so it is human to think, "I'm fine today"-----