SARS-CoV-2 Vaccine Breakthrough by Omicron and Delta Variants, New York, USA.

Vaccine type was also included in the top statistical models ( Appendix Table 1) and the trend toward reduced odds of Omicron infection after vaccination with the Janssen vaccine was borderline significant (OR 0.351, 95% CI 0.132–0.935, relative to Pfizer vaccine; OR 0.388, 95% CI 0.149–1.009, relative to any mRNA vaccine) ( Table 2 ).

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