Depletion of Susceptibles Bias in Analyses of Intra-season Waning of Influenza Vaccine Effectiveness. Author(s): Ray GT, Lewis N, Klein NP, Daley MF, Lipsitch M, Fireman B|Journal: Clin Infect Dis|PMID: 31351439| August 2019 Bias arises in studies of waning vaccine effectiveness when higher-risk individuals are depleted from the population at-risk, at different rates…