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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The asymptomatic rate is very much in line with other estimates (most of the time, very high asymptomatic rates are due to different definitions of 'symptoms'). The low IFR seems to me likely to be explained by right-censoring
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It appears that the authors took the death numbers up until 15/08 despite the survey finishing 08/08. You'd expect more people to die from the infected population over the next few weeks/months, pushing the IFR up
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