Abstract:
BACKGROUND:Concern arose in 2010 that reactogenicity, particularly febrile seizures, to influenza A/H1N1-containing 2010-2011 trivalent seasonal inactivated influenza vaccine (TIV) could occur in young children who had been previously immunized and/or infected with the pandemic strain. We conducted a pre-season study of 2010-2011 TIV safety and immunogenicity in children 12-59 months of age to inform public health decision making. METHODS:Children immunized with 1 or 2 doses of the pandemic vaccine, with or without the 2009-10 TIV, received 1 or 2 doses of 2010-11 TIV in an observational, multicentre Canadian study. Standard safety monitoring was enhanced by a telephone call at ~24 h post-TIV when adverse events were expected to peak. Summary safety reports were rapidly reported to public health before the launch of public programs. TIV immunogenicity was assessed day 0, and 21 days after final vaccination. Clinical Trials Registration NCT01180621. RESULTS:Among 207 children, a general adverse event was reported by 60.9% of children post-dose one and by 58.3% post-dose two. Only severe fever (>38.5°C) was more common in two-dose compared to one dose recipients (16.7%, n=4 v. 1.0%, n=2). At baseline 99.0% of participants had A/H1N1 hemagglutinin inhibition (HAI) titers ≥10, and 85.5% had a protective titer of ≥40 (95% CI 80.0, 90.0). Baseline geometric mean titers (GMT) were higher in recipients of a 2-dose schedule of pandemic vaccine compared to one-dose recipients: 153.1 (95% CI 126.2, 185.7) v. 78.8 ((58.1, 106.8, p<0.001). At 21 days, all regulatory criteria for influenza vaccine immunogenicity were exceeded for A/H1N1 and H3N2, but responses to the B antigen were poor. No correlations between reactogenicity and either baseline high influenza titers or serologic response to revaccination were evident. CONCLUSIONS:Infants and toddlers who received AS03-adjuvanted A/H1N1 2009 vaccine up to 11 months earlier retained high titers in the subsequent season but re-exposure to A/H1N1 2009 antigen in TIV resulted in no unusual adverse effects and 100% were sero-protected for A/H1N1 after receipt of the 2010-11 TIV.
journal_name
Vaccinejournal_title
Vaccineauthors
Langley JM,Scheifele DW,Quach C,Vanderkooi OG,Ward B,McNeil S,Dobson S,Kellner JD,Kuhn S,Kollman T,MacKinnon-Cameron D,Smith B,Li Y,Halperin SAdoi
10.1016/j.vaccine.2012.03.046subject
Has Abstractpub_date
2012-05-14 00:00:00pages
3389-94issue
23eissn
0264-410Xissn
1873-2518pii
S0264-410X(12)00438-0journal_volume
30pub_type
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