We know of two different cases where the culprits who spread the disease were identified.
In late June, one couple our age, 80 something got hammered with the Delta variant and ended up in the big PPO's hospital for about a week and a week at a step down unit. They supposedly got it from her PT, and he was hammered with the critter. Their family living next door got it and were over it in a few days.
Our contractor earlier this month got hammered with this Delta variant. His wife and two young daughters barely had it. Supposedly, a baby sitter gave it to friends of their daughters, who gave it their daughters and their mother, his wife. Then he got it from his family.
My wife and I were wondering what was new as the PCR tests could/can not be that specific.
Maybe now we know.