I think the ACB Rose Garden reception may have had the same treatment with the COVID infected wipe down of select chairs.
I agree the ACB reception was the infection event. The timing is better but I suspect the food as this thing spreads mainly through oral-fecal vectors just like Polio.
The Rose garden reception was outdoors but there was an indoor component. The would have to be doing RNA sequencing to pin this down and I doubt that is being done.
For everyone to have got it all at once pretty much rules out outdoor transmission. It looks like to me ACB was the target and Trump and the GOP senators were collateral albeit desirable damage. She is a bigger threat to the Dems at the moment rather than Trump.
Read through this thread for more detail
http://market-ticker.org/cgi-ticker/akcs-www?post=240361&page=1