a shame to see Yates out of it already. Ayuso said he is feeling sick as well, but his test were negative so far.
According to Bennett's blog, there's indeed a chance to continue with a positive test as well in the Vuelta, btw, but in his case the virus load was too high:
"At the Tour de France in July, Polish rider Rafal Majka was allowed continue to race with Covid because his viral load was deemed really low, so an hour before the start, I was still pinning numbers on my jersey and hoping test results from the Vuelta’s mobile lab would come back like his.
As I waited tentatively for the results, I felt fine so I really expected the virus to be low in my body. The results said otherwise, and instead of rolling down the start ramp, I watched the time trial from my hotel room this afternoon."