There is something to this. I went to my first indoor restaurant on Sat since March, basically, and was seated with 10 people from 5 different households so not exactly an approved “social pandemic bubble cohort” or whatever.
Then I found out after some time that they guy across from me had covid in April, so I could relax more. I couldn’t infect him and he couldn’t infect me.
Herd immunity. It’s not a big deal but was a small comfort.
The USA is nowhere near herd immunity. SARS COVID II has a documented R0 of at least 2.4. I’ll save the class the calculus it means that for that level of transmission the population also known as the herd MUST have antibodies and long term Tcell immunity in 70% OR MORE of the entire population. Less than that and herd immunity is not scientifically nor medically possible. The current infection penetration rate in the USA is under 4% we are NO WHERE EVEN CLOSE to herd immunity. The only way to get to 70+ % penetration is with artificial inoculation via a vaccine or mass IV administrations of antibodies just like POTUS got via rendesivier. With a 4 % penetration rate over 200,000 Americans have died to get to 70% by raw in the wild infection you do the math it’s 5th grade level math. Only 4% of 330 million have documented infections even a 3 to one asymptomatic rate means only 16% at most have been exposed. And 3 to one is generously over estimating the asymptomatic to symptomatic rates.