Effectiveness of ChAdOx1 vaccine in older adults during SARS-CoV-2 Gamma variant circulation in São Paulo
Hitchings MDT, Ranzani OT, Dorion M, D’Agostini T, de Paula RC, de Paula OFP, de Moura Villela EF, Torres MSS, de Oliveira SB, Schulz W, Almiron M, Said R, de Oliveira RD, Silva PV, de Araújo WN, Gorinchteyn JC, Andrews JR, Cummings DAT, Ko AI, Croda J. Effectiveness of ChAdOx1 vaccine in older adults during SARS-CoV-2 Gamma variant circulation in São Paulo. Nature Communications 2021, 12: 6220. PMID: 34711813, PMCID: PMC8553924, DOI: 10.1038/s41467-021-26459-6.Peer-Reviewed Original ResearchConceptsSingle doseOxford-AstraZeneca COVID-19 vaccineTest-negative case-control studySevere COVID-19 outcomesCOVID-19COVID-19-related deathsTwo-dose scheduleTwo-dose regimenCase-control studyCOVID-19 outcomesInter-dose intervalCOVID-19 hospitalizationCOVID-19 vaccineSARS-CoV-2ChAdOx1 vaccinePrimary endpointSecondary endpointsFirst doseSecond doseHigh prevalenceElderly individualsElderly populationVariant prevalenceVaccine supplyHospitalizationEffectiveness of the CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil: test negative case-control study
Ranzani OT, Hitchings MDT, Dorion M, D'Agostini TL, de Paula RC, de Paula OFP, Villela EFM, Torres MSS, de Oliveira SB, Schulz W, Almiron M, Said R, de Oliveira RD, Vieira da Silva P, de Araújo WN, Gorinchteyn JC, Andrews JR, Cummings DAT, Ko AI, Croda J. Effectiveness of the CoronaVac vaccine in older adults during a gamma variant associated epidemic of covid-19 in Brazil: test negative case-control study. The BMJ 2021, 374: n2015. PMID: 34417194, PMCID: PMC8377801, DOI: 10.1136/bmj.n2015.Peer-Reviewed Original ResearchConceptsSymptomatic COVID-19Negative case-control studyCase-control studyHospital admissionVaccine effectivenessSecond doseDose regimenElderly populationCOVID-19Reverse transcription polymerase chain reaction testingTranscription polymerase chain reaction testingPolymerase chain reaction testingGamma variantInactivated whole virus vaccineAdjusted vaccine effectivenessTest-negative controlsWhole virus vaccineCOVID-19 statusCOVID-19 symptomsYounger age groupsMunicipality of residenceSARS-CoV-2RT-PCR testSelf-reported raceCoronaVac vaccine