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  • Title: Antibody responses to natural influenza A/H1N1/09 disease or following immunization with adjuvanted vaccines, in immunocompetent and immunocompromised children.
    Author: Meier S, Bel M, L'huillier A, Crisinel PA, Combescure C, Kaiser L, Grillet S, Pósfay-Barbe K, Siegrist CA, H1N1 Epidemiology Study Group of Geneva.
    Journal: Vaccine; 2011 Apr 27; 29(19):3548-57. PubMed ID: 21419775.
    Abstract:
    OBJECTIVES: To compare antibody responses elicited by influenza A/H1N1/09 disease and immunization with adjuvanted vaccines, in immunocompetent or immunocompromised children. STUDY DESIGN: Prospective parallel cohort field study enrolling children with confirmed influenza A/H1N1/09 disease or immunized with 1 (immunocompetent) or 2 (immunocompromised) doses of influenza A/H1N1/09 squalene-based AS03- or MF59-adjuvanted vaccines. Antibody geometric mean titers (GMT) were measured by hemagglutination inhibition (HAI) and microneutralization (MN) assays 4-6 weeks after vaccination/disease. Vaccine adverse events were self-recorded in a 7-day diary. RESULTS: Antibody titers were as high in 48 immunocompetent children after a single immunization (HAI and MN seroprotection rates: 98%; HAI-GMT: 395, MN-GMT: 370) as in 51 convalescent children (seroprotection rates: 98% (HAI) and 92% (MN); GMT: 350 (HAI) and 212 (MN). Twenty-seven immunocompromised children reached slightly lower seroprotection rates (HAI: 89%, MN: 85%) but similar antibody titers (HAI-GMT: 306, MN-GMT: 225) after 2 immunizations. Adverse events increased with age (P=0.01) and were more frequent with Pandemrix® than Focetria® (P=0.03). CONCLUSIONS: Similarly high seroresponses may be expected in immunocompetent children after a single dose of adjuvanted vaccines as responses of convalescent children. Two vaccine doses were sufficient for most immunocompromised children. TRIAL REGISTRATION: NCT0102293 and NCT01022905.
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