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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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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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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Thanks-when I see an IFR outside of the 0.3-0.7% range I pause and think of your database efforts. I fear we will see the right-wing media mouthpieces working hard to get the broadcasted IFR lower. And of course the large non-death burden of this disease is often underreported.
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