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 t...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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BMC
2018-12-01
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| Series: | BMC Infectious Diseases |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s12879-018-3484-z |
| _version_ | 1818299288965349376 |
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| author | Alexandra Almeida Cláudia Codeço Paula M. Luz |
| author_facet | Alexandra Almeida Cláudia Codeço Paula M. Luz |
| author_sort | Alexandra Almeida |
| collection | DOAJ |
| description | 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 calculated several seasonal measures such as the center of gravity or mean timing of activity. The relationship between the seasonal signatures and latitude was clear and statistically significant. States with seasonal signature are clustered along the coast. Most Amazonian and Central West states exhibit no seasonal behavior. Among the seasonal states, influenza starts in Northeast region, spreading southbound. Conclusions Our study advances the comprehension of influenza seasonality in tropical areas and could be used to design more effective prevention and control strategies. |
| first_indexed | 2024-12-13T04:48:51Z |
| format | Article |
| id | doaj.art-124d1175880e491881935b7c51592a32 |
| institution | Directory Open Access Journal |
| issn | 1471-2334 |
| language | English |
| last_indexed | 2024-12-13T04:48:51Z |
| publishDate | 2018-12-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Infectious Diseases |
| spelling | doaj.art-124d1175880e491881935b7c51592a322022-12-21T23:59:04ZengBMCBMC Infectious Diseases1471-23342018-12-011811910.1186/s12879-018-3484-zSeasonal dynamics of influenza in Brazil: the latitude effectAlexandra Almeida0Cláudia Codeço1Paula M. Luz2Escola Nacional de Saúde Pública, FIOCRUZPrograma de Computação Científica, FIOCRUZInstituto Nacional de Infectologia Evandro Chagas, FIOCRUZAbstract 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 calculated several seasonal measures such as the center of gravity or mean timing of activity. The relationship between the seasonal signatures and latitude was clear and statistically significant. States with seasonal signature are clustered along the coast. Most Amazonian and Central West states exhibit no seasonal behavior. Among the seasonal states, influenza starts in Northeast region, spreading southbound. Conclusions Our study advances the comprehension of influenza seasonality in tropical areas and could be used to design more effective prevention and control strategies.http://link.springer.com/article/10.1186/s12879-018-3484-zInfluenzaSeasonalityWavelet decompositionCircular |
| spellingShingle | Alexandra Almeida Cláudia Codeço Paula M. Luz Seasonal dynamics of influenza in Brazil: the latitude effect BMC Infectious Diseases Influenza Seasonality Wavelet decomposition Circular |
| title | Seasonal dynamics of influenza in Brazil: the latitude effect |
| title_full | Seasonal dynamics of influenza in Brazil: the latitude effect |
| title_fullStr | Seasonal dynamics of influenza in Brazil: the latitude effect |
| title_full_unstemmed | Seasonal dynamics of influenza in Brazil: the latitude effect |
| title_short | Seasonal dynamics of influenza in Brazil: the latitude effect |
| title_sort | seasonal dynamics of influenza in brazil the latitude effect |
| topic | Influenza Seasonality Wavelet decomposition Circular |
| url | http://link.springer.com/article/10.1186/s12879-018-3484-z |
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