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Did the H1N1 Vaccine Reduce the Risk of Admission with Influenza and Pneumonia during the Pandemic?

Identifieur interne : 000234 ( Main/Exploration ); précédent : 000233; suivant : 000235

Did the H1N1 Vaccine Reduce the Risk of Admission with Influenza and Pneumonia during the Pandemic?

Auteurs : Salaheddin M. Mahmud [Canada] ; Songul Bozat-Emre [Canada] ; Gregory Hammond [Canada] ; Lawrence Elliott [Canada] ; Paul Van Caeseele [Canada]

Source :

RBID : pubmed:26600435

Descripteurs français

English descriptors

Abstract

BACKGROUND

The extent to which A(H1N1)pdm09 influenza vaccines prevented hospital admissions with pneumonia and influenza (P&I) during the 2009 pandemic remains poorly understood. We evaluated the effectiveness of the A(H1N1)pdm09 and seasonal influenza vaccines (TIV) used during the 2009 mass vaccination campaign in Manitoba (Canada) in preventing P&I hospitalization.

METHODS

A population-based record-linkage nested case-control study. Cases (N = 1,812) were persons hospitalized with influenza (ICD-10:J09-J11) or pneumonia (ICD-10:J12-J18) during the study period. Age-, gender- and area of residence-matched controls (N = 7,915) were randomly sampled from Manitoba's Population Registry. Information on receipt of A(H1N1)pdm09 vaccine and TIV was obtained from the Manitoba Immunization Monitoring System, a province-wide vaccine registry.

RESULTS

Overall, the adjuvanted A(H1N1)pdm09 vaccine was 27% (95%CI 13-39%) effective against P&I hospitalization ≥ 14 days following administration. Effectiveness seemed lower among older (≥ 65 years) adults (10%; -16-30%), particularly when compared to under-5 children (58%; 30-75%). The number-needed-to-vaccinate to prevent 1 P&I admission was lowest among <4 year-olds (928) and ≥65 years (1,721). VE against hospitalization with laboratory-confirmed A(H1N1)pdm09 was 70% (39-85%) overall and (91%; 62-98%) ≥ 14 days following vaccination.

DISCUSSION

Our data suggest that the adjuvanted A(H1N1)pdm09 vaccine was effective in preventing about 55-60% of P&I hospitalizations among children and younger adults who were at much higher risk of infection. Unfortunately, the vaccine was less effective among 65 or older adults. Despite that the vaccine still had a significant population-based impact especially among the very young (<5) and the older (≥ 65 years).


DOI: 10.1371/journal.pone.0142754
PubMed: 26600435
PubMed Central: PMC4658136


Affiliations:


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<term>Adjuvants immunologiques (MeSH)</term>
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<b>BACKGROUND</b>
</p>
<p>The extent to which A(H1N1)pdm09 influenza vaccines prevented hospital admissions with pneumonia and influenza (P&I) during the 2009 pandemic remains poorly understood. We evaluated the effectiveness of the A(H1N1)pdm09 and seasonal influenza vaccines (TIV) used during the 2009 mass vaccination campaign in Manitoba (Canada) in preventing P&I hospitalization.</p>
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<p>
<b>METHODS</b>
</p>
<p>A population-based record-linkage nested case-control study. Cases (N = 1,812) were persons hospitalized with influenza (ICD-10:J09-J11) or pneumonia (ICD-10:J12-J18) during the study period. Age-, gender- and area of residence-matched controls (N = 7,915) were randomly sampled from Manitoba's Population Registry. Information on receipt of A(H1N1)pdm09 vaccine and TIV was obtained from the Manitoba Immunization Monitoring System, a province-wide vaccine registry.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>RESULTS</b>
</p>
<p>Overall, the adjuvanted A(H1N1)pdm09 vaccine was 27% (95%CI 13-39%) effective against P&I hospitalization ≥ 14 days following administration. Effectiveness seemed lower among older (≥ 65 years) adults (10%; -16-30%), particularly when compared to under-5 children (58%; 30-75%). The number-needed-to-vaccinate to prevent 1 P&I admission was lowest among <4 year-olds (928) and ≥65 years (1,721). VE against hospitalization with laboratory-confirmed A(H1N1)pdm09 was 70% (39-85%) overall and (91%; 62-98%) ≥ 14 days following vaccination.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>DISCUSSION</b>
</p>
<p>Our data suggest that the adjuvanted A(H1N1)pdm09 vaccine was effective in preventing about 55-60% of P&I hospitalizations among children and younger adults who were at much higher risk of infection. Unfortunately, the vaccine was less effective among 65 or older adults. Despite that the vaccine still had a significant population-based impact especially among the very young (<5) and the older (≥ 65 years).</p>
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<ISOAbbreviation>PLoS ONE</ISOAbbreviation>
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<ArticleTitle>Did the H1N1 Vaccine Reduce the Risk of Admission with Influenza and Pneumonia during the Pandemic?</ArticleTitle>
<Pagination>
<MedlinePgn>e0142754</MedlinePgn>
</Pagination>
<ELocationID EIdType="doi" ValidYN="Y">10.1371/journal.pone.0142754</ELocationID>
<Abstract>
<AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">The extent to which A(H1N1)pdm09 influenza vaccines prevented hospital admissions with pneumonia and influenza (P&I) during the 2009 pandemic remains poorly understood. We evaluated the effectiveness of the A(H1N1)pdm09 and seasonal influenza vaccines (TIV) used during the 2009 mass vaccination campaign in Manitoba (Canada) in preventing P&I hospitalization.</AbstractText>
<AbstractText Label="METHODS" NlmCategory="METHODS">A population-based record-linkage nested case-control study. Cases (N = 1,812) were persons hospitalized with influenza (ICD-10:J09-J11) or pneumonia (ICD-10:J12-J18) during the study period. Age-, gender- and area of residence-matched controls (N = 7,915) were randomly sampled from Manitoba's Population Registry. Information on receipt of A(H1N1)pdm09 vaccine and TIV was obtained from the Manitoba Immunization Monitoring System, a province-wide vaccine registry.</AbstractText>
<AbstractText Label="RESULTS" NlmCategory="RESULTS">Overall, the adjuvanted A(H1N1)pdm09 vaccine was 27% (95%CI 13-39%) effective against P&I hospitalization ≥ 14 days following administration. Effectiveness seemed lower among older (≥ 65 years) adults (10%; -16-30%), particularly when compared to under-5 children (58%; 30-75%). The number-needed-to-vaccinate to prevent 1 P&I admission was lowest among <4 year-olds (928) and ≥65 years (1,721). VE against hospitalization with laboratory-confirmed A(H1N1)pdm09 was 70% (39-85%) overall and (91%; 62-98%) ≥ 14 days following vaccination.</AbstractText>
<AbstractText Label="DISCUSSION" NlmCategory="CONCLUSIONS">Our data suggest that the adjuvanted A(H1N1)pdm09 vaccine was effective in preventing about 55-60% of P&I hospitalizations among children and younger adults who were at much higher risk of infection. Unfortunately, the vaccine was less effective among 65 or older adults. Despite that the vaccine still had a significant population-based impact especially among the very young (<5) and the older (≥ 65 years).</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y">
<Author ValidYN="Y">
<LastName>Mahmud</LastName>
<ForeName>Salaheddin M</ForeName>
<Initials>SM</Initials>
<AffiliationInfo>
<Affiliation>Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Winnipeg Regional Health Authority, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Manitoba Health, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Bozat-Emre</LastName>
<ForeName>Songul</ForeName>
<Initials>S</Initials>
<AffiliationInfo>
<Affiliation>Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Manitoba Health, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Hammond</LastName>
<ForeName>Gregory</ForeName>
<Initials>G</Initials>
<AffiliationInfo>
<Affiliation>Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Medicine, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Elliott</LastName>
<ForeName>Lawrence</ForeName>
<Initials>L</Initials>
<AffiliationInfo>
<Affiliation>Community Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Winnipeg Regional Health Authority, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Manitoba Health, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
</Author>
<Author ValidYN="Y">
<LastName>Van Caeseele</LastName>
<ForeName>Paul</ForeName>
<Initials>P</Initials>
<AffiliationInfo>
<Affiliation>Medical Microbiology, University of Manitoba, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Cadham Provincial Laboratory, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
<AffiliationInfo>
<Affiliation>Manitoba Health, Winnipeg, Manitoba, Canada.</Affiliation>
</AffiliationInfo>
</Author>
</AuthorList>
<Language>eng</Language>
<PublicationTypeList>
<PublicationType UI="D016428">Journal Article</PublicationType>
<PublicationType UI="D013485">Research Support, Non-U.S. Gov't</PublicationType>
</PublicationTypeList>
<ArticleDate DateType="Electronic">
<Year>2015</Year>
<Month>11</Month>
<Day>23</Day>
</ArticleDate>
</Article>
<MedlineJournalInfo>
<Country>United States</Country>
<MedlineTA>PLoS One</MedlineTA>
<NlmUniqueID>101285081</NlmUniqueID>
<ISSNLinking>1932-6203</ISSNLinking>
</MedlineJournalInfo>
<ChemicalList>
<Chemical>
<RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D000276">Adjuvants, Immunologic</NameOfSubstance>
</Chemical>
<Chemical>
<RegistryNumber>0</RegistryNumber>
<NameOfSubstance UI="D007252">Influenza Vaccines</NameOfSubstance>
</Chemical>
</ChemicalList>
<CitationSubset>IM</CitationSubset>
<MeshHeadingList>
<MeshHeading>
<DescriptorName UI="D000276" MajorTopicYN="N">Adjuvants, Immunologic</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D000293" MajorTopicYN="N">Adolescent</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D000328" MajorTopicYN="N">Adult</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D000368" MajorTopicYN="N">Aged</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D016022" MajorTopicYN="N">Case-Control Studies</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D002648" MajorTopicYN="N">Child</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D002675" MajorTopicYN="N">Child, Preschool</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D005260" MajorTopicYN="N">Female</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D006760" MajorTopicYN="N">Hospitalization</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D006801" MajorTopicYN="N">Humans</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D017589" MajorTopicYN="N">Immunization Programs</DescriptorName>
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<MeshHeading>
<DescriptorName UI="D007223" MajorTopicYN="N">Infant</DescriptorName>
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<MeshHeading>
<DescriptorName UI="D053118" MajorTopicYN="N">Influenza A Virus, H1N1 Subtype</DescriptorName>
<QualifierName UI="Q000276" MajorTopicYN="Y">immunology</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D007252" MajorTopicYN="N">Influenza Vaccines</DescriptorName>
<QualifierName UI="Q000276" MajorTopicYN="Y">immunology</QualifierName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D007251" MajorTopicYN="N">Influenza, Human</DescriptorName>
<QualifierName UI="Q000453" MajorTopicYN="N">epidemiology</QualifierName>
<QualifierName UI="Q000517" MajorTopicYN="Y">prevention & control</QualifierName>
</MeshHeading>
<MeshHeading>
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<MeshHeading>
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<MeshHeading>
<DescriptorName UI="D008875" MajorTopicYN="N">Middle Aged</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D058873" MajorTopicYN="N">Pandemics</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D010343" MajorTopicYN="N">Patient Admission</DescriptorName>
</MeshHeading>
<MeshHeading>
<DescriptorName UI="D011014" MajorTopicYN="N">Pneumonia</DescriptorName>
<QualifierName UI="Q000453" MajorTopicYN="N">epidemiology</QualifierName>
<QualifierName UI="Q000517" MajorTopicYN="Y">prevention & control</QualifierName>
</MeshHeading>
<MeshHeading>
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