From the New England Journal of Medicine about Covid-19 herd immunity without flu symptoms:
An important finding of this report is that more than half the residents of this skilled nursing facility (27 of 48) who had positive tests were asymptomatic at testing.
People in a nursing facility typically suffer from poor health, co-mobidity, and other health issues. Nevertheless, half of these unhealthy people had Covid-19 without symptoms. This is good news because it shows even unhealthy groups can develop large percentages of persons with antibodies, which brings the vaunted herd immunity.
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