Short thread. I keep seeing claims on how some places may have reached herd immunity & calculations on whether a variant is more virulent or disporportionately affects the young etc. These are not easy things to discern so let’s not do confident back-of-the-envelope calculations.
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A historical irony is that the Public Health Service actually did manage to pull off a nationwide household survey during the 1918-19 pandemic, but we couldn't today ...https://twitter.com/awgaffney/status/1368300653043474432?s=20 …
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