Seasonality of influenza in Brazil: a traveling wave from the Amazon to the subtropics.
Identifieur interne : 000212 ( Main/Exploration ); précédent : 000211; suivant : 000213Seasonality of influenza in Brazil: a traveling wave from the Amazon to the subtropics.
Auteurs : Wladimir J. Alonso [États-Unis] ; Cécile Viboud ; Lone Simonsen ; Eduardo W. Hirano ; Luciane Z. Daufenbach ; Mark A. MillerSource :
- American journal of epidemiology [ 0002-9262 ] ; 2007.
Descripteurs français
- KwdFr :
- MESH :
- mortalité : Grippe humaine, Pneumopathie infectieuse.
- épidémiologie : Brésil.
- Analyse de Fourier, Femelle, Flambées de maladies, Humains, Mâle, Saisons, Surveillance de la population.
- Wicri :
- geographic : Brésil.
English descriptors
- KwdEn :
- MESH :
- geographic , epidemiology : Brazil.
- mortality : Influenza, Human, Pneumonia.
- Disease Outbreaks, Female, Fourier Analysis, Humans, Male, Population Surveillance, Seasons.
Abstract
Influenza circulation and mortality impact in tropical areas have not been well characterized. The authors studied the seasonality of influenza throughout Brazil, a geographically diverse country, by modeling influenza-related mortality and laboratory surveillance data. Monthly time series of pneumonia and influenza mortality were obtained from 1979 to 2001 for each of the 27 Brazilian states. Detrended time series were analyzed by Fourier decomposition to describe the amplitude and timing of annual and semiannual epidemic cycles, and the resulting seasonal parameters were compared across latitudes, ranging from the equator (+5 degrees N) to the subtropics (-35 degrees S). Seasonality in mortality was most pronounced in southern states (winter epidemics, June-July), gradually attenuated toward central states (15 degrees S) (p < 0.001), and remained low near the equator. A seasonal southward traveling wave of influenza was identified across Brazil, originating from equatorial and low-population regions in March-April and moving toward temperate and highly populous regions over a 3-month period. Laboratory surveillance data from recent years provided independent confirmation that mortality peaks coincided with influenza virus activity. The direction of the traveling wave suggests that environmental forces (temperature, humidity) play a more important role than population factors (density, travel) in driving the timing of influenza epidemics across Brazil.
DOI: 10.1093/aje/kwm012
PubMed: 17369609
Affiliations:
Links toward previous steps (curation, corpus...)
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Alonso</name><affiliation wicri:level="2"><nlm:affiliation>Fogarty International Center, National Institutes of Health, Bethesda, MD 20892-6710, USA. alonsow@mail.nih.gov</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Fogarty International Center, National Institutes of Health, Bethesda, MD 20892-6710</wicri:regionArea><placeName><region type="state">Maryland</region></placeName></affiliation></author><author><name sortKey="Viboud, Cecile" sort="Viboud, Cecile" uniqKey="Viboud C" first="Cécile" last="Viboud">Cécile Viboud</name></author><author><name sortKey="Simonsen, Lone" sort="Simonsen, Lone" uniqKey="Simonsen L" first="Lone" last="Simonsen">Lone Simonsen</name></author><author><name sortKey="Hirano, Eduardo W" sort="Hirano, Eduardo W" uniqKey="Hirano E" first="Eduardo W" last="Hirano">Eduardo W. Hirano</name></author><author><name sortKey="Daufenbach, Luciane Z" sort="Daufenbach, Luciane Z" uniqKey="Daufenbach L" first="Luciane Z" last="Daufenbach">Luciane Z. Daufenbach</name></author><author><name sortKey="Miller, Mark A" sort="Miller, Mark A" uniqKey="Miller M" first="Mark A" last="Miller">Mark A. 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Hirano</name></author><author><name sortKey="Daufenbach, Luciane Z" sort="Daufenbach, Luciane Z" uniqKey="Daufenbach L" first="Luciane Z" last="Daufenbach">Luciane Z. Daufenbach</name></author><author><name sortKey="Miller, Mark A" sort="Miller, Mark A" uniqKey="Miller M" first="Mark A" last="Miller">Mark A. Miller</name></author></analytic><series><title level="j">American journal of epidemiology</title><idno type="ISSN">0002-9262</idno><imprint><date when="2007" type="published">2007</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Brazil (epidemiology)</term><term>Disease Outbreaks</term><term>Female</term><term>Fourier Analysis</term><term>Humans</term><term>Influenza, Human (mortality)</term><term>Male</term><term>Pneumonia (mortality)</term><term>Population Surveillance</term><term>Seasons</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Analyse de Fourier</term><term>Brésil (épidémiologie)</term><term>Femelle</term><term>Flambées de maladies</term><term>Grippe humaine (mortalité)</term><term>Humains</term><term>Mâle</term><term>Pneumopathie infectieuse (mortalité)</term><term>Saisons</term><term>Surveillance de la population</term></keywords><keywords scheme="MESH" type="geographic" qualifier="epidemiology" xml:lang="en"><term>Brazil</term></keywords><keywords scheme="MESH" qualifier="mortality" xml:lang="en"><term>Influenza, Human</term><term>Pneumonia</term></keywords><keywords scheme="MESH" qualifier="mortalité" xml:lang="fr"><term>Grippe humaine</term><term>Pneumopathie infectieuse</term></keywords><keywords scheme="MESH" qualifier="épidémiologie" xml:lang="fr"><term>Brésil</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Disease Outbreaks</term><term>Female</term><term>Fourier Analysis</term><term>Humans</term><term>Male</term><term>Population Surveillance</term><term>Seasons</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Analyse de Fourier</term><term>Femelle</term><term>Flambées de maladies</term><term>Humains</term><term>Mâle</term><term>Saisons</term><term>Surveillance de la population</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Brésil</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Influenza circulation and mortality impact in tropical areas have not been well characterized. The authors studied the seasonality of influenza throughout Brazil, a geographically diverse country, by modeling influenza-related mortality and laboratory surveillance data. Monthly time series of pneumonia and influenza mortality were obtained from 1979 to 2001 for each of the 27 Brazilian states. Detrended time series were analyzed by Fourier decomposition to describe the amplitude and timing of annual and semiannual epidemic cycles, and the resulting seasonal parameters were compared across latitudes, ranging from the equator (+5 degrees N) to the subtropics (-35 degrees S). Seasonality in mortality was most pronounced in southern states (winter epidemics, June-July), gradually attenuated toward central states (15 degrees S) (p < 0.001), and remained low near the equator. A seasonal southward traveling wave of influenza was identified across Brazil, originating from equatorial and low-population regions in March-April and moving toward temperate and highly populous regions over a 3-month period. Laboratory surveillance data from recent years provided independent confirmation that mortality peaks coincided with influenza virus activity. The direction of the traveling wave suggests that environmental forces (temperature, humidity) play a more important role than population factors (density, travel) in driving the timing of influenza epidemics across Brazil.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">17369609</PMID><DateCompleted><Year>2007</Year><Month>07</Month><Day>31</Day></DateCompleted><DateRevised><Year>2007</Year><Month>12</Month><Day>03</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Print">0002-9262</ISSN><JournalIssue CitedMedium="Print"><Volume>165</Volume><Issue>12</Issue><PubDate><Year>2007</Year><Month>Jun</Month><Day>15</Day></PubDate></JournalIssue><Title>American journal of epidemiology</Title><ISOAbbreviation>Am. J. Epidemiol.</ISOAbbreviation></Journal><ArticleTitle>Seasonality of influenza in Brazil: a traveling wave from the Amazon to the subtropics.</ArticleTitle><Pagination><MedlinePgn>1434-42</MedlinePgn></Pagination><Abstract><AbstractText>Influenza circulation and mortality impact in tropical areas have not been well characterized. The authors studied the seasonality of influenza throughout Brazil, a geographically diverse country, by modeling influenza-related mortality and laboratory surveillance data. Monthly time series of pneumonia and influenza mortality were obtained from 1979 to 2001 for each of the 27 Brazilian states. Detrended time series were analyzed by Fourier decomposition to describe the amplitude and timing of annual and semiannual epidemic cycles, and the resulting seasonal parameters were compared across latitudes, ranging from the equator (+5 degrees N) to the subtropics (-35 degrees S). Seasonality in mortality was most pronounced in southern states (winter epidemics, June-July), gradually attenuated toward central states (15 degrees S) (p < 0.001), and remained low near the equator. A seasonal southward traveling wave of influenza was identified across Brazil, originating from equatorial and low-population regions in March-April and moving toward temperate and highly populous regions over a 3-month period. Laboratory surveillance data from recent years provided independent confirmation that mortality peaks coincided with influenza virus activity. The direction of the traveling wave suggests that environmental forces (temperature, humidity) play a more important role than population factors (density, travel) in driving the timing of influenza epidemics across Brazil.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Alonso</LastName><ForeName>Wladimir J</ForeName><Initials>WJ</Initials><AffiliationInfo><Affiliation>Fogarty International Center, National Institutes of Health, Bethesda, MD 20892-6710, USA. alonsow@mail.nih.gov</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Viboud</LastName><ForeName>Cécile</ForeName><Initials>C</Initials></Author><Author ValidYN="Y"><LastName>Simonsen</LastName><ForeName>Lone</ForeName><Initials>L</Initials></Author><Author ValidYN="Y"><LastName>Hirano</LastName><ForeName>Eduardo W</ForeName><Initials>EW</Initials></Author><Author ValidYN="Y"><LastName>Daufenbach</LastName><ForeName>Luciane Z</ForeName><Initials>LZ</Initials></Author><Author ValidYN="Y"><LastName>Miller</LastName><ForeName>Mark A</ForeName><Initials>MA</Initials></Author></AuthorList><Language>eng</Language><GrantList CompleteYN="Y"><Grant><GrantID>MD516982</GrantID><Acronym>MD</Acronym><Agency>NIMHD NIH HHS</Agency><Country>United States</Country></Grant></GrantList><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType><PublicationType UI="D052061">Research Support, N.I.H., Extramural</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2007</Year><Month>03</Month><Day>16</Day></ArticleDate></Article><MedlineJournalInfo><Country>United States</Country><MedlineTA>Am J Epidemiol</MedlineTA><NlmUniqueID>7910653</NlmUniqueID><ISSNLinking>0002-9262</ISSNLinking></MedlineJournalInfo><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D001938" MajorTopicYN="N" Type="Geographic">Brazil</DescriptorName><QualifierName UI="Q000453" MajorTopicYN="N">epidemiology</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D004196" MajorTopicYN="Y">Disease Outbreaks</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D005260" MajorTopicYN="N">Female</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D005583" MajorTopicYN="N">Fourier Analysis</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D006801" MajorTopicYN="N">Humans</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D007251" MajorTopicYN="N">Influenza, Human</DescriptorName><QualifierName UI="Q000401" MajorTopicYN="Y">mortality</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D008297" MajorTopicYN="N">Male</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D011014" MajorTopicYN="N">Pneumonia</DescriptorName><QualifierName UI="Q000401" MajorTopicYN="N">mortality</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D011159" MajorTopicYN="N">Population Surveillance</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D012621" MajorTopicYN="Y">Seasons</DescriptorName></MeshHeading></MeshHeadingList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="pubmed"><Year>2007</Year><Month>3</Month><Day>21</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="medline"><Year>2007</Year><Month>8</Month><Day>1</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate><PubMedPubDate PubStatus="entrez"><Year>2007</Year><Month>3</Month><Day>21</Day><Hour>9</Hour><Minute>0</Minute></PubMedPubDate></History><PublicationStatus>ppublish</PublicationStatus><ArticleIdList><ArticleId IdType="pubmed">17369609</ArticleId><ArticleId IdType="pii">kwm012</ArticleId><ArticleId IdType="doi">10.1093/aje/kwm012</ArticleId></ArticleIdList></PubmedData></pubmed><affiliations><list><country><li>États-Unis</li></country><region><li>Maryland</li></region></list><tree><noCountry><name sortKey="Daufenbach, Luciane Z" sort="Daufenbach, Luciane Z" uniqKey="Daufenbach L" first="Luciane Z" last="Daufenbach">Luciane Z. Daufenbach</name><name sortKey="Hirano, Eduardo W" sort="Hirano, Eduardo W" uniqKey="Hirano E" first="Eduardo W" last="Hirano">Eduardo W. Hirano</name><name sortKey="Miller, Mark A" sort="Miller, Mark A" uniqKey="Miller M" first="Mark A" last="Miller">Mark A. Miller</name><name sortKey="Simonsen, Lone" sort="Simonsen, Lone" uniqKey="Simonsen L" first="Lone" last="Simonsen">Lone Simonsen</name><name sortKey="Viboud, Cecile" sort="Viboud, Cecile" uniqKey="Viboud C" first="Cécile" last="Viboud">Cécile Viboud</name></noCountry><country name="États-Unis"><region name="Maryland"><name sortKey="Alonso, Wladimir J" sort="Alonso, Wladimir J" uniqKey="Alonso W" first="Wladimir J" last="Alonso">Wladimir J. Alonso</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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