Reality Check – again

An excellent summary of the Covid stats by Luke Massey in the Spectator. I have just one thing to add – the true measure of the lethality of a virus is surely its Infection Mortality Rate (IFR). Massey correctly observes that the the Case Fatality Rate (CFR) for Covid is strikingly low, and should concern us no more than the annual flu season. But we also know that Covid is unusual in the very high numbers of infections which result in mild or no symptoms, thus never becoming ‘cases’. The IFR is therefore likely to be an order of magnitude lower than the CFR, implying that herd immunity was, and should be a perfectly sensible public health strategy.

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