I feel your pain. Autoimmune here, but currently only treated with low dose corticosteroids. Guessing we’ll be next in line for a booster. Honestly if a friend of a friend tests positive; I wait until the friend is tested, but I’m nervous until I hear.
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I thought it was about Kevin Bacon 
Good info here. Especially that Delta may be contagious earlier.
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This is the nest article I found on Delta timelines, from MIT. You could be contagious in 1.5 days after exposure to Delta. It can detected by a test around 4 days after exposure. In theory you can be exposed and expose someone else before the person who exposes you has symptoms worthy of testing.
https://medical.mit.edu/covid-19-updates/2021/07/are-things-different-delta
Caveat, the research is evolving, but I went with the most conservative numbers.
While normally I find probabilities useful, for Delta, I can’t decide for me what is acceptably low enough risk for potentially exposing unvaccinated children. Or anyone, really. Or how to translate risk tolerance into behavior. Now that I saw how sick my vaccinated assistant got with a “mild case” (who got it from someone who was also vaccinated and also was pretty sick), my risk tolerance has dropped. I am not living the hermit life. I went on planes and public transit. But knowing I was in the window of even potential transmission, and knowing what activities I had planned, impacted my decisions. I felt like I had to assume I was exposed, regardless of the low probability. If I had no plans to travel, I wouldn’t have worried so much.
Very confusing what is the socially responsible thing for a vaccinated person to do.
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I live in Brooklyn, NY and there is a NYC testing site a 10 minute walk from my apartment. They do the quick and the other test. I got the results of the quick test before I got home, the other the following day, on MyChart. I needed it for a trip to St. Croix and it was amazingly simple. I believe they are open every day from 8 am to 8 pm. Easy peasy and the city is encouraging people to get tested as often as they deem necessary, whatever the exposure. Here are the guidelines: https://www1.nyc.gov/assets/doh/downloads/pdf/imm/covid-19-testing-faq.pdf