title: Effectiveness of influenza vaccination.
authors.forename: Jennifer C
authors.initials: JC
authors.lastname: Nelson
authors.forename: Michael L
authors.initials: ML
authors.lastname: Jackson
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Jackson
mesh_terms: D000368:Aged; D015982:Bias; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000401:mortality / Q000517:prevention & control*; D012306:Risk; D012621:Seasons
chemical_list: D007252:Influenza Vaccines