Mean number of days between someone getting infected with #COVIDー19 and their *infector* showing symptoms is negative 0.19 days! Suggesting most transmission is happening from pre-symptomatic individuals and masks are critical.https://www.medrxiv.org/content/10.1101/2020.03.21.20040329v1 …
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I would say it points to futility of contact tracing, by the time you have a contact to trace they’ve done much of their transmission
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More like danger of having too much faith on it.https://twitter.com/slowblogger/status/1250076108424282113?s=19 …
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