For the week of May 3, 2021, the estimated vaccine effectiveness shows fully-vaccinated New Yorkers had a 92.4% lower chance of becoming a COVID-19 case, compared to unvaccinated New Yorkers.
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Beginning the week of December 13, 2021, after the emergence of the Omicron variant, vaccine effectiveness against cases began to decline again. In the most recent week, vaccine effectiveness was 77.8%. This means fully-vaccinated New Yorkers had about a 78% lower chance of becoming a COVID-19 case, compared to unvaccinated New Yorkers. The New York State Department of Health will continue to closely monitor trends in vaccine effectiveness as the epidemic evolves.
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Across the time period of analysis, fully-vaccinated New Yorkers had between an 90.2% and 95.7% lower chance of being hospitalized with COVID-19, compared to unvaccinated New Yorkers.