Publication | Open Access

Protective immunity of SARS-CoV-2 infection and vaccines against medically attended symptomatic omicron BA.4, BA.5, and XBB reinfections in Singapore: a national cohort study

VaccinationNational Cohort StudyVaccine DevelopmentSars-cov-2 InfectionCovid-19 PandemicImmunologyVaccine EfficacyInfection ControlXbb ReinfectionsMedicineEpidemiologyCovid-19