Thank you.
I confess that I'm not sure I understood your question, but I'm going to take my best shot at addressing it.
I would agree, if I understand you correctly, that there are just so many different ways in which the virus is being fed, many of which we don't even know, and some of which, yes, continue to arise from people from other jurisdictions, and much of it, as you mentioned, being found in larger urban centres. For example, in Ontario it's more so that Windsor, Toronto, London and Ottawa continue to have a pandemic crisis, and in much of the rest of the province, there's really not so much.
In that sense, the context in which contact tracing, for example, would be useful and helpful may be quite limited in urban centres—extremely limited—and at this stage possibly useless. That's not to say that down the line it would not be useful in those regions where there's a very small population, and that's a way in which to keep the virus from spreading at all.
The way in which this virus is going to be reduced by way of contact-tracing apps in urban centres.... There may be a correlation, but I don't know if we'll be able to say, oh, this caused that. On the other hand, in smaller populations it may be otherwise.
I'm going to let the professor take it from here.