Maybe this isn’t done as much as earlier in the pandemic, but wouldn’t the normal contact-tracing protocols after detecting a positive case be to quarantine. for 7-10 days, anyone who was in close contact with the infected person(s)? Or at least have those folks who had significant contact tested for the next several days in case they are in an incubation phase? If one of the four positive cases involved, let’s say, an asst. DS or a team masseuse, one would think that’s close enough contact with riders that the team’s riders should be tested regularly rather than wait till next weekend? It’s a moot point, I guess, since I know the Tour is not going to do that (they will stick with rest-day testing only) but wondering if epidemiologists would say they should?