Vaccine breakthrough cases are defined as instances in which an individual tested positive for COVID-19 after being fully-vaccinated (more than 14 days after completing their vaccine series). This report details the levels of such cases, and hospitalizations among fully-vaccinated people, in New York State. This information has been ascertained by matching records in statewide immunization databases with statewide testing and daily hospital reporting systems.

These findings demonstrate that such cases and hospitalizations have occurred in New York State, but at levels substantially lower than among unvaccinated people. This is because COVID-19 vaccines are working to protect the health of New Yorkers. The estimated high protective effect of vaccines against confirmed infection, and even higher effect for hospitalization, agree with findings from clinical and population studies conducted around the world. Because protection from vaccines is not 100%, additional measures such as mask wearing offer extra protection, particularly in areas of increased transmission.

Updates to this breakthrough data report will be published approximately weekly and include data through the designated “as of” date.

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