Seasonal dynamics of influenza in Brazil: the latitude effect.

ABSTRACT:

Background

Influenza is a global transmissible disease. Its dynamics is far better understood in temperate climates than in the tropics. We aim to close this knowledge gap between tropical and temperate regions by showing how the influenza seasonality evolves in Brazil, a tropical country that encompasses a wide range of latitudes and six climatic sub-types.

Methods

We analyzed a state-level, weekly Syndrome of Acute Respiratory Disease (SARI) incidence data ranging from 2010 to 2016. We combined two techniques hierarchically: first the wavelet decomposition technique to detect annual periodicity and then circular statistics to describe seasonal measures of the periodic states.

Results

We found significant annual periodicity in 44% of the states. For these, we calcula

SUBMITTER: Almeida A 

PROVIDER: S-EPMC6307116 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature