title: Stratified estimates of influenza vaccine effectiveness by prior vaccination: caution required.
authors.forename: Sheena G
authors.initials: SG
authors.lastname: Sullivan
authors.forename: Heath
authors.initials: H
authors.lastname: Kelly
mesh_terms: D004812:Epidemiologic Methods; D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology*; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control*; D015233:Models, Statistical; D016896:Treatment Outcome
chemical_list: D007252:Influenza Vaccines