The effect of mandatory COVID-19 certificates on vaccine uptake: synthetic-control modelling of six countries – The Lancet Public Health

COVID-19 certification led to increased vaccinations 20 days before implementation in anticipation, with a lasting effect up to 40 days after. Countries with pre-intervention uptake that was below average had a more pronounced increase in daily vaccinations compared with those where uptake was already average or higher. Source: The effect of mandatory COVID-19 certificates on vaccine uptake: synthetic-control modelling of six countries – The Lancet Public Health