Hepatitis A vaccination of Argentinean infants: comparison of two vaccination schedules.
Vaccine
; 25(1): 102-8, 2007 Jan 02.
Article
en En
| MEDLINE
| ID: mdl-16914234
ABSTRACT
BACKGROUND:
Early immunization to protect infants against hepatitis A (HA) is recommended in intermediate or high endemic areas of the world, but little is known of the effects of maternal antibodies on the immune response. We studied the immunogenicity and reactogenicity of an inactivated HA vaccine administered in two different schedules to 2-month-old infants in an intermediate/high endemic area in Argentina.METHODS:
In this double-blind, randomized study 131 infants received either three doses (at 2, 4, 6 months of age [Group A]) or one dose (at 6 months of age [Group B]) of the pediatric inactivated HA vaccine, Avaxim 80, and a booster dose at 15-18 months. HAV antibodies were measured (ELISA) at 2, 7, 15-18 and 16-19 months of age. Immediate (30 min after injection) and solicited local and systemic reactions were recorded for 7 days after each injection.RESULTS:
Of 107/131 subjects (81.6%) who completed the study and who provided final serum samples after booster dose, 94 (87.8%) were seropositive at enrolment (>20 mIU/mL) with geometric mean concentrations (GMC) of 2989 and 3637 mIU/mL in Groups A and B, respectively. One month post-booster GMCs were 8236 mIU/ml (95% CI; 6304, 10760) and 1687 mIU/ml (1148, 2479) in Groups A and B, respectively, with 100% seroprotection.CONCLUSIONS:
The HA vaccine was well tolerated and induced immunological priming in both groups during the first year of life in spite of the presence of maternal antibodies. Post-booster GMCs achieved after one or three primary doses suggest a long-term protection against HA.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Esquemas de Inmunización
/
Vacunas contra la Hepatitis A
/
Anticuerpos de Hepatitis A
/
Hepatitis A
Tipo de estudio:
Clinical_trials
Límite:
Female
/
Humans
/
Infant
/
Male
País/Región como asunto:
America do sul
/
Argentina
Idioma:
En
Revista:
Vaccine
Año:
2007
Tipo del documento:
Article
País de afiliación:
Argentina