RT @JeffTownsend: Testing for COVID-19 is much more effective when performed immediately prior to social mixing: https://t.co/ANJFxljz1F…
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@CDCDirector One thing is for sure, though: the window of _48 h_ pre-flight from China is NOT NARROW ENOUGH for a negative test to provide any kind of effective prevention of transmission during or after travel. https://t.co/0ergGDtTMz
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@adamjkucharski The x-axis can be transformed from the unknown "days since infection"—to the known "test time before travel or event", which provides clarity regarding the benefits of testing immediately or 24 h prior to travel or an event. https://t.co/K