Thank you for sending me this paper in Science Immunology (one of many now) showing strong immunity developing in health care workers even after asymptomatic or mild infection. Wanted to remind you of the two arms of the immune system https://immunology.sciencemag.org/content/5/54/eabf3698
Discordant neutralizing antibody and T cell responses in asymptomatic and mild SARS-CoV-2 infection

Understanding the nature of immunity following mild/asymptomatic infection with SARS-CoV-2 is crucial to controlling the pandemic. We analyzed T cell and neutralizing antibody responses in 136...

https://immunology.sciencemag.org/content/5/54/eabf3698
B cells make antibodies ("neutralizing" means they 'kill' virus if put into cell culture with them) & T cells (cell-mediated). Memory B & T cells get triggered if they see pathogen again & fight it. Strong responses even w/ mild infection bode well for natural & vaccine immunity
So, reason I think we will get to herd immunity faster than some predicting is that we have likely had many more asymptomatic/mild infections than detected-immunity develops there; more will become immune with vaccines; eventually virus stops because can't find anyone to infect!
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