Dynamic behavior of sylvatic yellow fever in Brazil (1954-2008)

INTRODUCTION: Sylvatic yellow fever (SYF) is enzootic in Brazil, causing periodic outbreaks in humans living near forest borders or in rural areas. In this study, the cycling patterns of this arbovirosis were analyzed. METHODS: Spectral Fourier analysis was used to capture the periodicity patterns of SYF in time series. RESULTS: SYF outbreaks have not increased in frequency, only in the number of cases. There are two dominant cycles in SYF outbreaks, a seven year cycle for the central-western region and a 14 year cycle for the northern region. Most of the variance was concentrated in the central-western region and dominated the entire endemic region. CONCLUSIONS: The seven year cycle is predominant in the endemic region of the disease due the greater contribution of variance in the central-western region; however, it was possible identify a 14 cycle that governs SYF outbreaks in the northern region. No periodicities were identified for the remaining geographical regions.

Bibliographic Details

Main Authors:	Câmara,Fernando Portela, Gomes,Ana Luisa Bessa Bacellar, Carvalho,Luiz Max Fagundes de, Castello,Luiz Gustavo Veloso
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Medicina Tropical - SBMT 2011
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0037-86822011000300006
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