The Brazilian state of Maranhão (as large as Italy) reported a seroprevalence of COVID-19 of 40.4%
Obvious findings:
• «herd immunity threshold is not as low as 20%»
• «infection rates were significantly lower among mask wearers»
h/t @CovidSerologyhttps://www.medrxiv.org/content/10.1101/2020.08.28.20180463v1 …
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Given that the region was still experiencing 100 deaths per week at the censoring date, this difference is likely to be fairly substantial!
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Agreed, also excess death analysis suggest underreporting may be a much bigger issue than the 15% adjustment they authors made. Excess death is double reported COVID-19 fatalities. https://www.conass.org.br/indicadores-de-obitos-por-causas-naturais/ …pic.twitter.com/exsjQLA0uC
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