David Cullinane (Waterford, Sinn Fein) | Oireachtas source

I understand that and I also understand all the other parts, in particular the holistic approach and the individual responsibilities that come into it, and that the control measures and all those factors are important. However, there has to be a number. Is Professor Nolan saying the number is above 1 and that if it went above 1, that creates a difficulty and that is where the risk becomes unmanageable?