Effectiveness of the CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil: test negative case-control study
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Coronavirus disease 2019 (COVID-19)2019-20 coronavirus outbreakSevere acute respiratory syndrome coronavirus 2 (SARS-CoV-2)Test (biology)VirologyMedicineBiologyOutbreakInternal medicineInfectious disease (medical specialty)DiseasePaleontologySARS-CoV-2 and COVID-19 ResearchImmune responses and vaccinationsVaccine Coverage and Hesitancy