Preprint on COVID human challenge study clarifies some much debated questions. This shows viral load by PCR (blue) and live virus (red) following infection - virus comes up first in throat but reaches higher level in nose. (1/4). researchsquare.com/article/rs-112… 
A positive rapid antigen test appears to be a pretty good reflection of live virus shedding (black bars) (2/4)
Comparing the timelines of symptoms to virus shedding fits the idea that you can spread the virus when asymptomatic (green = "just noticeable", yellow = "bothersome some of the time") (3/4)
Note, the original strain was used for this study, not Omicron. A low infectious dose was used, resulting in ~50% of the subjects becoming infected. Volunteers were 18-29 years old and there were no severe illnesses.(4/4).
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