[fireman15]

The other interactions including the shopping cart are very unlikely.

No, one of the most sure ways to get this or any other contagious respiratory virus is to handle something teaming with active virus and then “rub” or pick your nose with your contaminated fingers. One of our favorite drills on the hazmat team that I was a leader of was to have two people go through the motions collecting and analyzing samples. The samples being analyzed were contaminated with a florescent dye that seemingly managed to get everywhere. Afterward we used a UV light to detect where our team members had been sloppy. You would be surprised how many team members somehow managed to have a glowing mustache under their nose or glowing areas near their eyes. This was always a great source of entertainment.

That is the biggest problem with making untrained people wear masks that do little more than make people's faces itch. Touching contaminated surfaces and then your face is one of the leading ways to spread a highly contagious pathogen.

[mad_as_he$$]

I participated in one of those drills. It was sad, concerning and comical all at the same time.

[palmer]

From what I've read about all the super spreading events, none of them involve surfaces exclusively. Some, like the office events, could have had surface involvement. The rest were aerosol and droplets in the air.

Without a comparative test for aerosols or airborne droplets, your surface test can't be compared to those. Nor did your test measure the dose, it appears to be been entirely qualitative.

[palmer]

Please read this: https://quillette.com/2020/04/23/covid-19-superspreader-events-in-28-countries-critical-patterns-and-lessons/

[Mom MD]

Even with trained people. The best exercise I heard during the ebola scRe was to out all your gear on., the have someone smear chocolate sauce all over you. Your task is to get the gear off without getting any chocolate sauce on you.....