'Disastrous' COVID decisions

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A man undergoes a COVID-19 vaccine trial at Chris Hani Baragwanath Hospital in Soweto
A man undergoes a COVID-19 vaccine trial at Chris Hani Baragwanath Hospital in Soweto
(Luca Sola / Getty)

A professor of medicine at Stanford says bad assumptions and incorrect data models caused an out-of-control COVID response.

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