Bringing a whole bunch of threads together, I think it's very accurate to say this was a novel virus we were feeling our way through. Of course the essence of [Technical difficulty—Editor] predict and replicate results in a predictable fashion, which is difficult to do. I take the example of masks. We were strongly advised not only not to use them, but that they would be harmful. This is a lesson from the WHO.
Where does the precautionary principle intersect with science? If the WHO were to say they were not quite sure about the efficacy of masks, but they have been helpful in reducing the transmission of droplets [Technical difficulty—Editor] so they would recommend that we use them if we want to as opposed to a hard no, is that one of the lessons that comes out of this? Perhaps we need to adjust the public health advice we give when we're not sure.