A composite epidemic curve for seasonal influenza in Canada with an international comparison.
Identifieur interne : 000705 ( Main/Exploration ); précédent : 000704; suivant : 000706A composite epidemic curve for seasonal influenza in Canada with an international comparison.
Auteurs : Dena L. Schanzer [Canada] ; Joanne M. Langley ; Trevor Dummer ; Cecile Viboud ; Theresa W S. TamSource :
- Influenza and other respiratory viruses [ 1750-2659 ] ; 2010.
Descripteurs français
- KwdFr :
- Canada (épidémiologie), Europe (épidémiologie), Grippe humaine (transmission), Grippe humaine (virologie), Grippe humaine (épidémiologie), Géographie (MeSH), Humains (MeSH), Incidence (MeSH), Saisons (MeSH), Sous-type H1N1 du virus de la grippe A (isolement et purification), Sous-type H3N2 du virus de la grippe A (isolement et purification), États-Unis (épidémiologie).
- MESH :
- isolement et purification : Sous-type H1N1 du virus de la grippe A, Sous-type H3N2 du virus de la grippe A.
- virologie : Grippe humaine.
- épidémiologie : Canada, Europe, Grippe humaine, États-Unis.
- Géographie, Humains, Incidence, Saisons.
- Wicri :
- geographic : Canada, États-Unis.
English descriptors
- KwdEn :
- Canada (epidemiology), Europe (epidemiology), Geography (MeSH), Humans (MeSH), Incidence (MeSH), Influenza A Virus, H1N1 Subtype (isolation & purification), Influenza A Virus, H3N2 Subtype (isolation & purification), Influenza, Human (epidemiology), Influenza, Human (transmission), Influenza, Human (virology), Seasons (MeSH), United States (epidemiology).
- MESH :
- geographic , epidemiology : Canada, Europe, United States.
- epidemiology : Influenza, Human.
- isolation & purification : Influenza A Virus, H1N1 Subtype, Influenza A Virus, H3N2 Subtype.
- transmission : Influenza, Human.
- virology : Influenza, Human.
- Geography, Humans, Incidence, Seasons.
Abstract
BACKGROUND
Empirical data on laboratory-confirmed seasonal influenza is limited by very low and possibly non-systematic case ascertainment as well as geographical variation.
OBJECTIVE
To provide a visual representation of an influenza epidemic at the community and regional level using empirical data and to describe the epidemic characteristics.
METHODS
Weekly influenza A confirmations were obtained from the Canadian FluWatch program and American FluView program for the 1997/1998-2006/2007 seasons; 1- year data were also available for Europe (FluNet, WHO). For seasons where at least 80% of the influenza A strains were antigenically similar, a composite epidemic curve was created by centring the local epidemics relative to their epidemic midpoint.
RESULTS
The range in timing of the regional peaks varied from 5 to 13 weeks. Once the epidemic curves were centred relative to their peak, the composite epidemic curves were similar for Canada, the United States and Europe, and the epidemic growth rates were similar for most subgroups (city size; regions; H1N1 versus H3N2 seasons). During the exponential growth period, the number of cases increased by a factor of 1.5-2.0 per week, averaging 1.8. Exponential growth was evident approximately 10 weeks before the peak. Evidence of sustained transmission occurred from mid-September to early June.
DISCUSSION
The shape of the composite curve created in this study clearly demonstrates a consistency in the epidemic pattern across geographically disparate locales. Laboratory confirmation will likely play an increasing role in the development of better methods for early detection and summary measures of influenza activity.
DOI: 10.1111/j.1750-2659.2010.00154.x
PubMed: 20716158
PubMed Central: PMC4634653
Affiliations:
Links toward previous steps (curation, corpus...)
Le document en format XML
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Langley</name></author><author><name sortKey="Dummer, Trevor" sort="Dummer, Trevor" uniqKey="Dummer T" first="Trevor" last="Dummer">Trevor Dummer</name></author><author><name sortKey="Viboud, Cecile" sort="Viboud, Cecile" uniqKey="Viboud C" first="Cecile" last="Viboud">Cecile Viboud</name></author><author><name sortKey="Tam, Theresa W S" sort="Tam, Theresa W S" uniqKey="Tam T" first="Theresa W S" last="Tam">Theresa W S. Tam</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2010">2010</date><idno type="RBID">pubmed:20716158</idno><idno type="pmid">20716158</idno><idno type="doi">10.1111/j.1750-2659.2010.00154.x</idno><idno type="pmc">PMC4634653</idno><idno type="wicri:Area/Main/Corpus">000621</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">000621</idno><idno type="wicri:Area/Main/Curation">000621</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Curation">000621</idno><idno type="wicri:Area/Main/Exploration">000621</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">A composite epidemic curve for seasonal influenza in Canada with an international comparison.</title><author><name sortKey="Schanzer, Dena L" sort="Schanzer, Dena L" uniqKey="Schanzer D" first="Dena L" last="Schanzer">Dena L. Schanzer</name><affiliation wicri:level="1"><nlm:affiliation>Infectious Disease and Emergency Preparedness Branch, Public Health Agency of Canada, Ottawa, ON, Canada. dena_schanzer@phac-aspc.gc.ca</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Infectious Disease and Emergency Preparedness Branch, Public Health Agency of Canada, Ottawa, ON</wicri:regionArea><wicri:noRegion>ON</wicri:noRegion></affiliation></author><author><name sortKey="Langley, Joanne M" sort="Langley, Joanne M" uniqKey="Langley J" first="Joanne M" last="Langley">Joanne M. Langley</name></author><author><name sortKey="Dummer, Trevor" sort="Dummer, Trevor" uniqKey="Dummer T" first="Trevor" last="Dummer">Trevor Dummer</name></author><author><name sortKey="Viboud, Cecile" sort="Viboud, Cecile" uniqKey="Viboud C" first="Cecile" last="Viboud">Cecile Viboud</name></author><author><name sortKey="Tam, Theresa W S" sort="Tam, Theresa W S" uniqKey="Tam T" first="Theresa W S" last="Tam">Theresa W S. Tam</name></author></analytic><series><title level="j">Influenza and other respiratory viruses</title><idno type="eISSN">1750-2659</idno><imprint><date when="2010" type="published">2010</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Canada (epidemiology)</term><term>Europe (epidemiology)</term><term>Geography (MeSH)</term><term>Humans (MeSH)</term><term>Incidence (MeSH)</term><term>Influenza A Virus, H1N1 Subtype (isolation & purification)</term><term>Influenza A Virus, H3N2 Subtype (isolation & purification)</term><term>Influenza, Human (epidemiology)</term><term>Influenza, Human (transmission)</term><term>Influenza, Human (virology)</term><term>Seasons (MeSH)</term><term>United States (epidemiology)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Canada (épidémiologie)</term><term>Europe (épidémiologie)</term><term>Grippe humaine (transmission)</term><term>Grippe humaine (virologie)</term><term>Grippe humaine (épidémiologie)</term><term>Géographie (MeSH)</term><term>Humains (MeSH)</term><term>Incidence (MeSH)</term><term>Saisons (MeSH)</term><term>Sous-type H1N1 du virus de la grippe A (isolement et purification)</term><term>Sous-type H3N2 du virus de la grippe A (isolement et purification)</term><term>États-Unis (épidémiologie)</term></keywords><keywords scheme="MESH" type="geographic" qualifier="epidemiology" xml:lang="en"><term>Canada</term><term>Europe</term><term>United States</term></keywords><keywords scheme="MESH" qualifier="epidemiology" xml:lang="en"><term>Influenza, Human</term></keywords><keywords scheme="MESH" qualifier="isolation & purification" xml:lang="en"><term>Influenza A Virus, H1N1 Subtype</term><term>Influenza A Virus, H3N2 Subtype</term></keywords><keywords scheme="MESH" qualifier="isolement et purification" xml:lang="fr"><term>Sous-type H1N1 du virus de la grippe A</term><term>Sous-type H3N2 du virus de la grippe A</term></keywords><keywords scheme="MESH" qualifier="transmission" xml:lang="en"><term>Influenza, Human</term></keywords><keywords scheme="MESH" qualifier="virologie" xml:lang="fr"><term>Grippe humaine</term></keywords><keywords scheme="MESH" qualifier="virology" xml:lang="en"><term>Influenza, Human</term></keywords><keywords scheme="MESH" qualifier="épidémiologie" xml:lang="fr"><term>Canada</term><term>Europe</term><term>Grippe humaine</term><term>États-Unis</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Geography</term><term>Humans</term><term>Incidence</term><term>Seasons</term></keywords><keywords scheme="MESH" xml:lang="fr"><term>Géographie</term><term>Humains</term><term>Incidence</term><term>Saisons</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Canada</term><term>États-Unis</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p><b>BACKGROUND</b></p><p>Empirical data on laboratory-confirmed seasonal influenza is limited by very low and possibly non-systematic case ascertainment as well as geographical variation.</p></div><div type="abstract" xml:lang="en"><p><b>OBJECTIVE</b></p><p>To provide a visual representation of an influenza epidemic at the community and regional level using empirical data and to describe the epidemic characteristics.</p></div><div type="abstract" xml:lang="en"><p><b>METHODS</b></p><p>Weekly influenza A confirmations were obtained from the Canadian FluWatch program and American FluView program for the 1997/1998-2006/2007 seasons; 1- year data were also available for Europe (FluNet, WHO). For seasons where at least 80% of the influenza A strains were antigenically similar, a composite epidemic curve was created by centring the local epidemics relative to their epidemic midpoint.</p></div><div type="abstract" xml:lang="en"><p><b>RESULTS</b></p><p>The range in timing of the regional peaks varied from 5 to 13 weeks. Once the epidemic curves were centred relative to their peak, the composite epidemic curves were similar for Canada, the United States and Europe, and the epidemic growth rates were similar for most subgroups (city size; regions; H1N1 versus H3N2 seasons). During the exponential growth period, the number of cases increased by a factor of 1.5-2.0 per week, averaging 1.8. Exponential growth was evident approximately 10 weeks before the peak. Evidence of sustained transmission occurred from mid-September to early June.</p></div><div type="abstract" xml:lang="en"><p><b>DISCUSSION</b></p><p>The shape of the composite curve created in this study clearly demonstrates a consistency in the epidemic pattern across geographically disparate locales. Laboratory confirmation will likely play an increasing role in the development of better methods for early detection and summary measures of influenza activity.</p></div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">20716158</PMID><DateCompleted><Year>2010</Year><Month>11</Month><Day>23</Day></DateCompleted><DateRevised><Year>2018</Year><Month>11</Month><Day>13</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1750-2659</ISSN><JournalIssue CitedMedium="Internet"><Volume>4</Volume><Issue>5</Issue><PubDate><Year>2010</Year><Month>Sep</Month></PubDate></JournalIssue><Title>Influenza and other respiratory viruses</Title><ISOAbbreviation>Influenza Other Respir Viruses</ISOAbbreviation></Journal><ArticleTitle>A composite epidemic curve for seasonal influenza in Canada with an international comparison.</ArticleTitle><Pagination><MedlinePgn>295-306</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1111/j.1750-2659.2010.00154.x</ELocationID><Abstract><AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">Empirical data on laboratory-confirmed seasonal influenza is limited by very low and possibly non-systematic case ascertainment as well as geographical variation.</AbstractText><AbstractText Label="OBJECTIVE" NlmCategory="OBJECTIVE">To provide a visual representation of an influenza epidemic at the community and regional level using empirical data and to describe the epidemic characteristics.</AbstractText><AbstractText Label="METHODS" NlmCategory="METHODS">Weekly influenza A confirmations were obtained from the Canadian FluWatch program and American FluView program for the 1997/1998-2006/2007 seasons; 1- year data were also available for Europe (FluNet, WHO). For seasons where at least 80% of the influenza A strains were antigenically similar, a composite epidemic curve was created by centring the local epidemics relative to their epidemic midpoint.</AbstractText><AbstractText Label="RESULTS" NlmCategory="RESULTS">The range in timing of the regional peaks varied from 5 to 13 weeks. Once the epidemic curves were centred relative to their peak, the composite epidemic curves were similar for Canada, the United States and Europe, and the epidemic growth rates were similar for most subgroups (city size; regions; H1N1 versus H3N2 seasons). During the exponential growth period, the number of cases increased by a factor of 1.5-2.0 per week, averaging 1.8. Exponential growth was evident approximately 10 weeks before the peak. Evidence of sustained transmission occurred from mid-September to early June.</AbstractText><AbstractText Label="DISCUSSION" NlmCategory="CONCLUSIONS">The shape of the composite curve created in this study clearly demonstrates a consistency in the epidemic pattern across geographically disparate locales. Laboratory confirmation will likely play an increasing role in the development of better methods for early detection and summary measures of influenza activity.</AbstractText></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Schanzer</LastName><ForeName>Dena L</ForeName><Initials>DL</Initials><AffiliationInfo><Affiliation>Infectious Disease and Emergency Preparedness Branch, Public Health Agency of Canada, Ottawa, ON, Canada. dena_schanzer@phac-aspc.gc.ca</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Langley</LastName><ForeName>Joanne M</ForeName><Initials>JM</Initials></Author><Author ValidYN="Y"><LastName>Dummer</LastName><ForeName>Trevor</ForeName><Initials>T</Initials></Author><Author ValidYN="Y"><LastName>Viboud</LastName><ForeName>Cecile</ForeName><Initials>C</Initials></Author><Author ValidYN="Y"><LastName>Tam</LastName><ForeName>Theresa W 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IdType="pubmed">15557003</ArticleId></ArticleIdList></Reference></ReferenceList></PubmedData></pubmed><affiliations><list><country><li>Canada</li></country></list><tree><noCountry><name sortKey="Dummer, Trevor" sort="Dummer, Trevor" uniqKey="Dummer T" first="Trevor" last="Dummer">Trevor Dummer</name><name sortKey="Langley, Joanne M" sort="Langley, Joanne M" uniqKey="Langley J" first="Joanne M" last="Langley">Joanne M. Langley</name><name sortKey="Tam, Theresa W S" sort="Tam, Theresa W S" uniqKey="Tam T" first="Theresa W S" last="Tam">Theresa W S. Tam</name><name sortKey="Viboud, Cecile" sort="Viboud, Cecile" uniqKey="Viboud C" first="Cecile" last="Viboud">Cecile Viboud</name></noCountry><country name="Canada"><noRegion><name sortKey="Schanzer, Dena L" sort="Schanzer, Dena L" uniqKey="Schanzer D" first="Dena L" last="Schanzer">Dena L. Schanzer</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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