"Outside clinical trials, the first COVID‐19 vaccine was administered on 8 December 2020. Researchers aimed to quantify the global impact of the first year of COVID‐19 vaccination programmes using mathematical modelling to fit COVID‐19 transmission and vaccination to reported COVID‐19 mortality and all‐cause excess mortality in 185 countries and territories."
https://pmc.ncbi.nlm.nih.gov/articles/PMC9537923/?user_id=66c4c92f5d78644b3ac5d5b4
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