They are trying as hard as possible, but, as I said, even if that is the case, I think there are two things the experts will be looking at. One is whether they are truly asymptomatic, because they could actually have symptoms, so they would be looking at that first. Then even if there are asymptomatic people who could transmit, is that just a rare event or is that frequent? If it is rare, it's really the extent to which this phenomenon occurs, so it might take some time for that to be looked at.
We know with coronaviruses and many other viruses that even if you are infectious at the start of the illness, you don't really readily transmit. It's when you are coughing the virus up and the droplets spread. You are coughing; you are sneezing. You are much more likely to transmit when you have symptoms, so basically we're looking at not just whether it happens but whether it is a very rare phenomenon. We want to understand the extent to which this occurs.
We do know that asymptomatic people are not the key driver of epidemics. That is very important to understand.