title: Ecological study on mortality from influenza and pneumonia before and after influenza vaccination in the Northeast and South of Brazil.
abstract: The study compared mortality from influenza and pneumonia in elderly people (65 years or older) before and since implementation of influenza vaccination in the South and Northeast regions of Brazil. Official population and mortality data were retrieved from government agencies to estimate weekly mortality rates. The Serfling model was used to identify influenza outbreaks and estimate the mortality attributable to them. In the South, the vaccination period showed a major reduction in mortality from influenza and pneumonia and in the number and duration of influenza outbreaks. These results were interpreted as consistent with the hypothesis of the vaccination program's effectiveness. In the Northeast, there was an increase in mortality from influenza and pneumonia during vaccination, which was associated with a quality improvement in recording causes of death in the elderly. An increase was also seen in mortality attributable to influenza outbreaks, suggesting a mismatch between the period in which vaccination is conducted and the relevant climatic characteristics for influenza transmission.
authors.affiliation: Faculdade de Saúde Pública, Universidade de São Paulo, São Paulo, Brasil.
authors.forename: Janessa de Fátima Morgado de
authors.initials: Jde F
authors.lastname: Oliveira
authors.affiliation: Centro de Ciências da Saúde, Universidade Federal de Santa Catarina, Florianópolis, Brasil.
authors.forename: Antonio Fernando
authors.initials: AF
authors.lastname: Boing
authors.affiliation: Faculdade de Saúde Pública, Universidade de São Paulo, São Paulo, Brasil.
authors.forename: Eliseu Alves
authors.initials: EA
authors.lastname: Waldman
authors.affiliation: Faculdade de Saúde Pública, Universidade de São Paulo, São Paulo, Brasil.
authors.forename: José Leopoldo Ferreira
authors.initials: JL
authors.lastname: Antunes
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil / Q000453:epidemiology; D004196:Disease Outbreaks / Q000517:prevention & control; D005260:Female; D006801:Humans; D007252:Influenza Vaccines / Q000008:administration & dosage*; D007251:Influenza, Human / Q000401:mortality* / Q000517:prevention & control*; D008297:Male; D032541:Mass Vaccination; D011014:Pneumonia / Q000401:mortality*; D012621:Seasons; D016896:Treatment Outcome
chemical_list: D007252:Influenza Vaccines