Dr. Tony Holohan:

Greater ability to investigate in real time and look back on all the factors that have led to transmission would be an important adjunct to our collective understanding. The more we can understand this and the earlier we can intervene on these things at local level the better. Our contact tracing system has worked well, to be fair to the HSE on this occasion. The system ran into a challenge when we had very high levels of widespread community transmission. Show me a country in Europe where that has not happened. Widespread community transmission challenges every part of the response to this, including contact tracing.