Abstract:
OBJECTIVE:Young children are generally considered immunologically naive with respect to influenza exposure opportunities; thus, a 2-dose schedule is recommended when a child is first immunized with conventional influenza vaccine lacking adjuvant. We estimated the effectiveness of a single pediatric dose of AS03-adjuvanted vaccine against hospitalization for confirmed pandemic influenza A/H1N1 (pH1N1) infection in children aged 6 months to 9 years during the fall 2009 vaccination campaign. METHODS:In a matched case-control design, case subjects were children hospitalized for pH1N1 infection in the Fall of 2009, in Quebec, Canada. Controls were nonhospitalized children, matched by age and region of residence. Vaccination status in case subjects and controls was ascertained in relation to the case subject's date of illness onset. Vaccine effectiveness was estimated through conditional logistic regression. RESULTS:The overall effectiveness of a single pediatric dose of vaccine administered ≥14 days before illness onset was 85% (95% confidence interval [CI]: 61% to 94%), varying according to age category but with wide and overlapping CIs: 92% (95% CI: 51% to 99%) in 6-23 month-old children, 89% (95% CI: 34% to 98%) in 2-4 year-olds, and 79% (95% CI: -31% to 96%) in 5-9 year-olds. Overall vaccine effectiveness for immunization ≥10 days before illness onset was slightly lower at 80% (95% CI: 60% to 90%), with similar variation according to age. CONCLUSION:In children aged 6 months to 9 years, a single pediatric dose of the AS03-adjuvanted pH1N1 vaccine was highly protective against hospitalization beginning at 10 and 14 days after vaccination.
journal_name
Pediatricsjournal_title
Pediatricsauthors
Gilca R,Deceuninck G,De Serres G,Boulianne N,Sauvageau C,Quach C,Boucher FD,Skowronski DMdoi
10.1542/peds.2010-3492subject
Has Abstractpub_date
2011-11-01 00:00:00pages
e1084-91issue
5eissn
0031-4005issn
1098-4275pii
peds.2010-3492journal_volume
128pub_type
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