Alliance for Pandemic Preparedness

April 7, 2021

Effects of Worldwide Interventions and Vaccination on COVID-19 between Waves and Countries

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  • [Pre-print, not peer-reviewed] The non-pharmaceutical interventions (NPIs) that had the greatest contributions to the decay ratio of SARS-CoV-2 infections in the first wave were restrictions on gatherings (27.8% contribution), use of face masks (16.8%), and school closures (10.1%), while in the second wave face masks (30%), restrictions on gatherings (17.5%), and international travel restrictions (9.2%) were most impactful. The study examined the effect of NPIs across 133 countries using publicly available data on SARS-CoV-2 infections and implementation of NPIs through March 25, 2021. The study also found that vaccinations have gradually contributed to reduced SARS-CoV-2 transmission, from 0.71% and 0.86% within 15 days and 30 days since Day 12 after vaccination, to 1.23% as of March 25th.

Ge et al. (Apr 6, 2021). Effects of Worldwide Interventions and Vaccination on COVID-19 between Waves and Countries. Pre-print downloaded Apr 7 from https://doi.org/10.1101/2021.03.31.21254702