So, again, my sister-in-law from Tucson got it while on a 30-day vacation in Fla. I went to Fla. and had close contact with her. (stayed in her condo). My 90-year-old mom caught it in Arizona, and brought it to Iowa My 65-year old sister caught it, too, and traveled here to Iowa and met me here with mom.
Now my brother caught it from his wife (my aforementioned sister-in-law).
Today, my daughter tested +, after she had contact with my sister and my mother on July 5 and 6. My daughter is a healthcare worker and now has to take time away from work.
Meanwhile, I am the most infamous catcher of COVID-19 (3x) in the family, and had more contact with infected persons than my daughter, between contacts with positive testers in Florida and Iowa. I tested negative, today. I have had the vaccine 5x.
Perhaps my immune system has been stimulated and I am finally resistant.