Climate-disease connections: Rift Valley Fever in Kenya
Autor(a) principal: | |
---|---|
Data de Publicação: | 2001 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Cadernos de Saúde Pública |
Texto Completo: | https://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643 |
Resumo: | All known Rift Valley fever(RVF) outbreaks in Kenya from 1950 to 1998 followed periods of abnormally high rainfall. On an interannual scale, periods of above normal rainfall in East Africa are associated with the warm phase of the El Niño/Southern Oscillation (ENSO) phenomenon. Anomalous rainfall floods mosquito-breeding habitats called dambos, which contain transovarially infected mosquito eggs. The eggs hatch Aedes mosquitoes that transmit the RVF virus preferentially to livestock and to humans as well. Analysis of historical data on RVF outbreaks and indicators of ENSO (including Pacific and Indian Ocean sea surface temperatures and the Southern Oscillation Index) indicates that more than three quarters of the RVF outbreaks have occurred during warm ENSO event periods. Mapping of ecological conditions using satellite normalized difference vegetation index (NDVI) data show that areas where outbreaks have occurred during the satellite recording period (1981-1998) show anomalous positive departures in vegetation greenness, an indicator of above-normal precipitation. This is particularly observed in arid areas of East Africa, which are predominantly impacted by this disease. These results indicate a close association between interannual climate variability and RVF outbreaks in Kenya. |
id |
FIOCRUZ-5_a3fbd7099cd41bfa805b34f97d384fa8 |
---|---|
oai_identifier_str |
oai:ojs.teste-cadernos.ensp.fiocruz.br:article/1643 |
network_acronym_str |
FIOCRUZ-5 |
network_name_str |
Cadernos de Saúde Pública |
repository_id_str |
|
spelling |
Climate-disease connections: Rift Valley Fever in KenyaRift Valley FeverDisease OutbreaksAedesInsect VectorsEcosystemAll known Rift Valley fever(RVF) outbreaks in Kenya from 1950 to 1998 followed periods of abnormally high rainfall. On an interannual scale, periods of above normal rainfall in East Africa are associated with the warm phase of the El Niño/Southern Oscillation (ENSO) phenomenon. Anomalous rainfall floods mosquito-breeding habitats called dambos, which contain transovarially infected mosquito eggs. The eggs hatch Aedes mosquitoes that transmit the RVF virus preferentially to livestock and to humans as well. Analysis of historical data on RVF outbreaks and indicators of ENSO (including Pacific and Indian Ocean sea surface temperatures and the Southern Oscillation Index) indicates that more than three quarters of the RVF outbreaks have occurred during warm ENSO event periods. Mapping of ecological conditions using satellite normalized difference vegetation index (NDVI) data show that areas where outbreaks have occurred during the satellite recording period (1981-1998) show anomalous positive departures in vegetation greenness, an indicator of above-normal precipitation. This is particularly observed in arid areas of East Africa, which are predominantly impacted by this disease. These results indicate a close association between interannual climate variability and RVF outbreaks in Kenya.Entre 1950 e 1998 houve surtos de febre no Vale do Rift, no Quênia, após períodos de aumentos pluviométricos anormais. Em escala interanual, esses períodos estiveram associados à fase quente do fenômeno ENSO (El Niño/Southern Oscillation) na África Oriental. As chuvas alagam os criadouros de mosquitos - dambos -, cujos ovos, infectados pela via transovariana, eclodem, produzindo mosquitos Aedes, transmissores do vírus da febre do Vale do Rift aos seres humanos e, em especial, ao gado. A análise dos dados históricos sobre surtos de febre do Vale do Rift e indicadores do fenômeno ENSO - incluindo temperaturas superficiais dos Oceanos Pacífico e Índico e o Índice de Oscilação Sul - mostrou que mais de 75% dos surtos ocorreram em períodos quentes do ENSO. Na época estudada - 1981-1998 -, o mapeamento das condições ecológicas via satélite (NDVI)- com dados normalizados sobre diferenças na vegetação - evidenciou que as áreas de surto apresentaram desvios anômalos na intensidade do verde da vegetação (indicador de pluviosidade alta), em particular, nas regiões áridas da África Oriental - as mais afetadas pela febre. Os resultados indicam associação estreita entre variabilidade climática interanual e surtos de febre do Vale do Rift no Quênia.Reports in Public HealthCadernos de Saúde Pública2001-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlapplication/pdfhttps://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643Reports in Public Health; Vol. 17 No. 7 (2001): Supplement 1Cadernos de Saúde Pública; v. 17 n. 7 (2001): Suplemento 11678-44640102-311Xreponame:Cadernos de Saúde Públicainstname:Fundação Oswaldo Cruz (FIOCRUZ)instacron:FIOCRUZenghttps://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643/3274https://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643/3275Anyamba, AssafLinthicum, Kenneth J.Tucker, Compton J.info:eu-repo/semantics/openAccess2024-03-06T15:26:33Zoai:ojs.teste-cadernos.ensp.fiocruz.br:article/1643Revistahttps://cadernos.ensp.fiocruz.br/ojs/index.php/csphttps://cadernos.ensp.fiocruz.br/ojs/index.php/csp/oaicadernos@ensp.fiocruz.br||cadernos@ensp.fiocruz.br1678-44640102-311Xopendoar:2024-03-06T13:01:55.974212Cadernos de Saúde Pública - Fundação Oswaldo Cruz (FIOCRUZ)true |
dc.title.none.fl_str_mv |
Climate-disease connections: Rift Valley Fever in Kenya |
title |
Climate-disease connections: Rift Valley Fever in Kenya |
spellingShingle |
Climate-disease connections: Rift Valley Fever in Kenya Anyamba, Assaf Rift Valley Fever Disease Outbreaks Aedes Insect Vectors Ecosystem |
title_short |
Climate-disease connections: Rift Valley Fever in Kenya |
title_full |
Climate-disease connections: Rift Valley Fever in Kenya |
title_fullStr |
Climate-disease connections: Rift Valley Fever in Kenya |
title_full_unstemmed |
Climate-disease connections: Rift Valley Fever in Kenya |
title_sort |
Climate-disease connections: Rift Valley Fever in Kenya |
author |
Anyamba, Assaf |
author_facet |
Anyamba, Assaf Linthicum, Kenneth J. Tucker, Compton J. |
author_role |
author |
author2 |
Linthicum, Kenneth J. Tucker, Compton J. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Anyamba, Assaf Linthicum, Kenneth J. Tucker, Compton J. |
dc.subject.por.fl_str_mv |
Rift Valley Fever Disease Outbreaks Aedes Insect Vectors Ecosystem |
topic |
Rift Valley Fever Disease Outbreaks Aedes Insect Vectors Ecosystem |
description |
All known Rift Valley fever(RVF) outbreaks in Kenya from 1950 to 1998 followed periods of abnormally high rainfall. On an interannual scale, periods of above normal rainfall in East Africa are associated with the warm phase of the El Niño/Southern Oscillation (ENSO) phenomenon. Anomalous rainfall floods mosquito-breeding habitats called dambos, which contain transovarially infected mosquito eggs. The eggs hatch Aedes mosquitoes that transmit the RVF virus preferentially to livestock and to humans as well. Analysis of historical data on RVF outbreaks and indicators of ENSO (including Pacific and Indian Ocean sea surface temperatures and the Southern Oscillation Index) indicates that more than three quarters of the RVF outbreaks have occurred during warm ENSO event periods. Mapping of ecological conditions using satellite normalized difference vegetation index (NDVI) data show that areas where outbreaks have occurred during the satellite recording period (1981-1998) show anomalous positive departures in vegetation greenness, an indicator of above-normal precipitation. This is particularly observed in arid areas of East Africa, which are predominantly impacted by this disease. These results indicate a close association between interannual climate variability and RVF outbreaks in Kenya. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643 |
url |
https://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643/3274 https://cadernos.ensp.fiocruz.br/ojs/index.php/csp/article/view/1643/3275 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html application/pdf |
dc.publisher.none.fl_str_mv |
Reports in Public Health Cadernos de Saúde Pública |
publisher.none.fl_str_mv |
Reports in Public Health Cadernos de Saúde Pública |
dc.source.none.fl_str_mv |
Reports in Public Health; Vol. 17 No. 7 (2001): Supplement 1 Cadernos de Saúde Pública; v. 17 n. 7 (2001): Suplemento 1 1678-4464 0102-311X reponame:Cadernos de Saúde Pública instname:Fundação Oswaldo Cruz (FIOCRUZ) instacron:FIOCRUZ |
instname_str |
Fundação Oswaldo Cruz (FIOCRUZ) |
instacron_str |
FIOCRUZ |
institution |
FIOCRUZ |
reponame_str |
Cadernos de Saúde Pública |
collection |
Cadernos de Saúde Pública |
repository.name.fl_str_mv |
Cadernos de Saúde Pública - Fundação Oswaldo Cruz (FIOCRUZ) |
repository.mail.fl_str_mv |
cadernos@ensp.fiocruz.br||cadernos@ensp.fiocruz.br |
_version_ |
1798943349583904768 |