The impact of COVID-19 certification mandates on the number of cases of and hospitalizations with COVID-19 in the UK: A difference-in-differences analysis.

Kim López-Güell,Albert Prats-Uribe,Martí Català,Clara Prats,Jotun Hein, Daniel Prieto-Alhambra

Frontiers in public health（2023）

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摘要

Mandatory COVID-19 certification reduced COVID-19 transmission and hospitalizations when Delta predominated in the UK, but lost efficacy when Omicron became the most common variant.

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关键词

covid certificate,covid passport,observational studies,public health,real-world data

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