"Methods: Employees of Cleveland Clinic in employment when the JN.1 lineage of SARS-CoV2 became the dominant circulating strain, were included...
Results: Among 47561 employees, COVID-19 occurred in 838 (1.8%) during the 16-week study period. In multivariable analysis, the 2023-2024 formula vaccinated state was associated with a significantly lower risk of COVID-19 while the JN.1 lineage was the dominant circulating strain (hazard ratio [HR], .77; 95% confidence interval [C.I.], .62-.94; P = .01), yielding an estimated vaccine effectiveness of 23% (95% C.I., 6%-38%). Compared to 0 or 1 prior vaccine doses, risk of COVID-19 was incrementally higher with 2 prior doses (HR, 1.46; 95% C.I., 1.12-1.90; P < .005), 3 prior doses (HR, 1.95; 95% C.I., 1.51-2.52; P < .001), and more than 3 prior doses (HR, 2.51; 95% C.I., 1.91-3.31; P < .001)."
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