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We use a 1% IFR for the UK for March and April. But that's due to a large proportion of care home deaths that skews the data. The same is true for the US and Canada. At one point 85% of Quebec's deaths are from care homes. Mortality rate for 80+ is over 10%, I believe.
WSJ estimates that close to half of all US deaths are from care homes: https://www.wsj.com/articles/coronavirus-deaths-in-u-s-nursing-long-term-care-facilities-top-50-000-11592306919 … I don't see that same ratio holding over the next few months, hence the lower IFR.
