title: Vaccine policy and incidence of influenza.
authors.forename: Hershel
authors.initials: H
authors.lastname: Jick
authors.forename: Douglas P
authors.initials: DP
authors.lastname: Chamberlin
authors.forename: Katrina W
authors.initials: KW
authors.lastname: Hagberg
mesh_terms: D000328:Adult; D000368:Aged; D004196:Disease Outbreaks / Q000517:prevention & control / Q000706:statistics & numerical data; D006291:Health Policy; D006801:Humans; D015994:Incidence; D007252:Influenza Vaccines / Q000627:therapeutic use*; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D008875:Middle Aged; D012621:Seasons; D055815:Young Adult
chemical_list: D007252:Influenza Vaccines