Association of COVID-19 Vaccine Intake with Diagnosis, Hospitalization, and Oxygenation/Ventilation: A Longitudinal Analysis, 2021-2022, Japan.

Although it did not reach statistical significance, decreased likelihoods of hospitalization and oxygenation and/or ventilation were observed among those who received 1 or 2+ doses of the COVID-19 vaccine during follow-up; the APRs of hospitalization were 0.78 (95% CI = 0.42–1.44) and 0.87 (95% CI = 0.47–1.61), respectively, and those of oxygenation and/or ventilation were 0.86 (95% CI = 0.39–1.90) and 0.61 (95% CI = 0.27–1.36), respectively.

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