So as I was saying:
There we were, by the first week of March, 2020, there are reputable reports in three very prominent journals that we have reason to believe there is asymptomatic spread of COVID.
That's just the scientific literature. At the same time, the government of China is quite certain that there is asymptomatic spread, and is behaving accordingly – both in its own infection control measures, and in the warnings they are trying to pass on to other governments around the world, including the US's, as the Trump interview betrayed.)
At this point, all of the CDC's recommendations are predicated on the notion that one can tell who has COVID by the fact they have symptoms.
This includes their recommendations to healthcare facilities on using masks.
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