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COVID-19 vaccine effectiveness reporting

The impact of reporting rules on COVID-19 vaccine effectiveness, including the use of specimen date versus death date and the effects on mortality trends and vaccine protection estimates.

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Jan 19, 2026
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How have reporting rules (test date vs death date) affected COVID-19 mortality trends by vaccination status?

Reporting rules that assign COVID-19 deaths to a case using either the positive test (specimen) date or the death date materially change apparent mortality trends by vaccination status because they de...