Effect of the number of coronavirus disease 2019 (COVID-19) vaccination shots on the occurrence of pneumonia, severe pneumonia, and death in SARS-CoV-2-infected patients.

After performing multivariable logistic regression and retaining nominally significant variables, two and three vaccination shots remained significant, and their OR were 0.445 and 0.558 in the optimal model (Two shots: p = 0.004; Three shots: p = 0.017) ( Figure 1 ).

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