2025
Topography and environmental deficiencies are associated with chikungunya virus exposure in urban informal settlements in Salvador, Brazil
Travis C, Argibay H, Pellizzaro M, de Oliveira D, Santana R, Palma F, Lustosa R, Santana J, Souza F, López Y, Reis M, Ko A, Diggle P, Ribeiro G, Begon M, Costa F, Khalil H, Eyre M. Topography and environmental deficiencies are associated with chikungunya virus exposure in urban informal settlements in Salvador, Brazil. PLOS Neglected Tropical Diseases 2025, 19: e0013477. PMID: 40911655, PMCID: PMC12440227, DOI: 10.1371/journal.pntd.0013477.Peer-Reviewed Original ResearchConceptsUrban informal settlementsPublic health burdenLow-income communitiesInformal settlementsGlobal public health burdenBinomial mixed-effects modelDegree of urbanisationHealth burdenMixed-effects modelsCHIKV seroprevalenceEnvironmental deficienciesReduced riskAssociated with seropositivityRisk factorsUrban communitiesMale sexBrazilian citiesRiskHouseholdsCommunityCHIKV seropositivityIndividualsEnvironmental factorsExposure patternsDomains individuals
2022
Use of Recently Vaccinated Individuals to Detect Bias in Test-Negative Case–Control Studies of COVID-19 Vaccine Effectiveness
Hitchings MDT, Lewnard JA, Dean NE, Ko AI, Ranzani OT, Andrews JR, Cummings DAT. Use of Recently Vaccinated Individuals to Detect Bias in Test-Negative Case–Control Studies of COVID-19 Vaccine Effectiveness. Epidemiology 2022, 33: 450-456. PMID: 35384900, PMCID: PMC9148635, DOI: 10.1097/ede.0000000000001484.Peer-Reviewed Original ResearchConceptsCOVID-19 vaccine effectivenessVaccine effectivenessNegative control exposureObservational studyControl exposurePhase III trialsTest-negative studiesTest-negative casesVaccine effectiveness estimatesCOVID-19 vaccineDemonstration of efficacyCOVID-19 riskIII trialsUnvaccinated individualsClinical trialsControl studyStudy designEffectiveness estimatesCareful study designUnmeasured confoundingSelection biasTrialsConfoundingExposureIndividuals
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