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Clinical and Immune Responses to Inactivated Influenza A(H1N1)pdm09 Vaccine in Children

Identifieur interne : 001118 ( Main/Exploration ); précédent : 001117; suivant : 001119

Clinical and Immune Responses to Inactivated Influenza A(H1N1)pdm09 Vaccine in Children

Auteurs : Karen L. Kotloff [États-Unis] ; Natasha B. Halasa [États-Unis] ; Christopher J. Harrison [États-Unis] ; Janet A. Englund [États-Unis] ; Emmanuel B. Walter [États-Unis] ; James C. King [États-Unis] ; C. Buddy Creech [États-Unis] ; Sara A. Healy [États-Unis] ; Rowena J. Dolor [États-Unis] ; Ina Stephens [États-Unis] ; Kathryn M. Edwards [États-Unis] ; Diana L. Noah [États-Unis] ; Heather Hill [États-Unis] ; Mark Wolff [États-Unis]

Source :

RBID : Pascal:14-0226638

Descripteurs français

English descriptors

Abstract

Background: As the influenza A H1N1 pandemic emerged in 2009, children were found to experience high morbidity and mortality and were prioritized for vaccination. This multicenter, randomized, double-blind, age-stratified trial assessed the safety and immunogenicity of inactivated influenza A(H1N1)pdm09 vaccine in healthy children aged 6 months to 17 years. Methods: Children received 2 doses of approximately 15 or 30 μg hemagglutin antigen 21 days apart. Reactogenicity was assessed for 8 days after each dose, adverse events through day 42, and serious adverse events or new-onset chronic illnesses through day 201. Serum hemagglutination inhibition titers were measured on days 0 (prevaccination), 8, 21, 29 and 42. Results: A total of 583 children received the first dose and 571 received the second dose of vaccine. Vaccinations were generally well-tolerated and no related serious adverse events were observed. The 15 μg dosage elicited a seroprotective hemagglutination inhibition (≥1:40) in 20%, 47% and 93% of children in the 6-35 month, 3-9 year and 10-17 year age strata 21 days after dose 1 and in 78%, 82% and 98% of children 21 days after dose 2, respectively. The 30 μg vaccine dosage induced similar responses. Conclusions: The inactivated influenza A(H1N1)pdm09 vaccine exhibited a favorable safety profile at both dosage levels. While a single 15 or 30 μg dose induced seroprotective antibody responses in most children 10-17 years of age, younger children required 2 doses, even when receiving dosages 4- to 6-fold higher than recommended. Well-tolerated vaccines are needed that induce immunity after a single dose for use in young children during influenza pandemics.


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Le document en format XML

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<front>
<div type="abstract" xml:lang="en">Background: As the influenza A H1N1 pandemic emerged in 2009, children were found to experience high morbidity and mortality and were prioritized for vaccination. This multicenter, randomized, double-blind, age-stratified trial assessed the safety and immunogenicity of inactivated influenza A(H1N1)pdm09 vaccine in healthy children aged 6 months to 17 years. Methods: Children received 2 doses of approximately 15 or 30 μg hemagglutin antigen 21 days apart. Reactogenicity was assessed for 8 days after each dose, adverse events through day 42, and serious adverse events or new-onset chronic illnesses through day 201. Serum hemagglutination inhibition titers were measured on days 0 (prevaccination), 8, 21, 29 and 42. Results: A total of 583 children received the first dose and 571 received the second dose of vaccine. Vaccinations were generally well-tolerated and no related serious adverse events were observed. The 15 μg dosage elicited a seroprotective hemagglutination inhibition (≥1:40) in 20%, 47% and 93% of children in the 6-35 month, 3-9 year and 10-17 year age strata 21 days after dose 1 and in 78%, 82% and 98% of children 21 days after dose 2, respectively. The 30 μg vaccine dosage induced similar responses. Conclusions: The inactivated influenza A(H1N1)pdm09 vaccine exhibited a favorable safety profile at both dosage levels. While a single 15 or 30 μg dose induced seroprotective antibody responses in most children 10-17 years of age, younger children required 2 doses, even when receiving dosages 4- to 6-fold higher than recommended. Well-tolerated vaccines are needed that induce immunity after a single dose for use in young children during influenza pandemics.</div>
</front>
</TEI>
<affiliations>
<list>
<country>
<li>États-Unis</li>
</country>
<region>
<li>Alabama</li>
<li>Caroline du Nord</li>
<li>Maryland</li>
<li>Missouri (État)</li>
<li>Tennessee</li>
<li>Washington (État)</li>
</region>
</list>
<tree>
<country name="États-Unis">
<region name="Maryland">
<name sortKey="Kotloff, Karen L" sort="Kotloff, Karen L" uniqKey="Kotloff K" first="Karen L." last="Kotloff">Karen L. Kotloff</name>
</region>
<name sortKey="Creech, C Buddy" sort="Creech, C Buddy" uniqKey="Creech C" first="C. Buddy" last="Creech">C. Buddy Creech</name>
<name sortKey="Dolor, Rowena J" sort="Dolor, Rowena J" uniqKey="Dolor R" first="Rowena J." last="Dolor">Rowena J. Dolor</name>
<name sortKey="Edwards, Kathryn M" sort="Edwards, Kathryn M" uniqKey="Edwards K" first="Kathryn M." last="Edwards">Kathryn M. Edwards</name>
<name sortKey="Englund, Janet A" sort="Englund, Janet A" uniqKey="Englund J" first="Janet A." last="Englund">Janet A. Englund</name>
<name sortKey="Halasa, Natasha B" sort="Halasa, Natasha B" uniqKey="Halasa N" first="Natasha B." last="Halasa">Natasha B. Halasa</name>
<name sortKey="Harrison, Christopher J" sort="Harrison, Christopher J" uniqKey="Harrison C" first="Christopher J." last="Harrison">Christopher J. Harrison</name>
<name sortKey="Healy, Sara A" sort="Healy, Sara A" uniqKey="Healy S" first="Sara A." last="Healy">Sara A. Healy</name>
<name sortKey="Hill, Heather" sort="Hill, Heather" uniqKey="Hill H" first="Heather" last="Hill">Heather Hill</name>
<name sortKey="King, James C" sort="King, James C" uniqKey="King J" first="James C." last="King">James C. King</name>
<name sortKey="Noah, Diana L" sort="Noah, Diana L" uniqKey="Noah D" first="Diana L." last="Noah">Diana L. Noah</name>
<name sortKey="Stephens, Ina" sort="Stephens, Ina" uniqKey="Stephens I" first="Ina" last="Stephens">Ina Stephens</name>
<name sortKey="Walter, Emmanuel B" sort="Walter, Emmanuel B" uniqKey="Walter E" first="Emmanuel B." last="Walter">Emmanuel B. Walter</name>
<name sortKey="Wolff, Mark" sort="Wolff, Mark" uniqKey="Wolff M" first="Mark" last="Wolff">Mark Wolff</name>
</country>
</tree>
</affiliations>
</record>

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