Vaccine effectiveness against SARS-CoV-2 infection with the Omicron or Delta variants following a two-dose or booster or mRNA-vaccination series

Preprint article. A Cohort study which demonstrates a rapid decline in effectiveness of vaccine protection over time for Delta and Omicron variant. Notably, authors suggest in a graph the “negative estimates in final period arguably suggest different patterns in vaccinated an unvaccinated causing an underestimation of vaccine effectiveness”

https://www.medrxiv.org/content/10.1101/2021.12.20.21267966v2

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