Impact of COVID-19 vaccination and vaccine type on morbidity and mortality in hospitalized patients: a retrospective cohort study in Egypt

COVID-19 vaccination was associated with improved clinical outcomes, reduced disease severity, and lower mortality among hospitalized patients. Disease severity and comorbidity burden were the strongest predictors of survival. No significant differences were observed among vaccine types in clinical outcomes. These findings support the protective role of COVID-19 vaccination in reducing severe disease and mortality.