Ecological study on mortality from influenza and pneumonia before and after influenza vaccination in the Northeast and South of Brazil

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.

Bibliographic Details

Main Authors:	Oliveira,Janessa de Fátima Morgado de, Boing,Antonio Fernando, Waldman,Eliseu Alves, Antunes,José Leopoldo Ferreira
Format:	Digital revista
Language:	English
Published:	Escola Nacional de Saúde Pública Sergio Arouca, Fundação Oswaldo Cruz 2013
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-311X2013001200017
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