much of that data comes from the oslo event when scores of people were infected with 0micron. so i think that is the thinking — two days before, three days after. we'll call it five, and you wear a mask for the additional five days, we think the probability of transmission then is low. and even if you do get transmission, we have antibodies and increasing oral options that will be available. we are more comfortable with treating covid. as a vaccinated person, we know you are very unlikely to get serious disease, hospitalisation and death, very different from november 2020. does it bother you, at all, this new regime, if you like? i appreciate there is an economic call for it, a business sense to it, but you, as a medical man and a scientist, are you anxious? i am a little anxious, to be honest, david, and that's because we don't