Rt Hon JACINDA ARDERN: A good question. One of the issues is that with the trials we have at the moment, there is not sufficient data to tell us whether or not the prevention of the onset of disease is going to have an effect on transmission—so being vaccinated does not mean that you will not still pass on COVID-19 to others. It may well mean that, but we don't have enough data yet to tell us. What we do know is that there has been an observed reduction in asymptomatic infections, and so you can assume that it will have an impact. To answer your question, though, around what scale of immunisation, of course we want herd immunity—that's the best way that we can protect our population. 