Single-dose Universal Hepatitis A Immunization in One-year-old Children in Argentina: High Prevalence of Protective Antibodies up to 9 Years After Vaccination.
Pediatr Infect Dis J
; 35(12): 1339-1342, 2016 12.
Article
en En
| MEDLINE
| ID: mdl-27636725
ABSTRACT
BACKGROUND:
Single-dose hepatitis A virus (HAV) vaccination was implemented in all Argentinean children 12 months of age in 2005. Previous studies demonstrated high prevalence of protective antibody response 4 years after single-dose vaccination. This study assessed long-term seroprotection against HAV after vaccination.METHODS:
Children who received 1 dose of HAV vaccine at 1 year of age at least 6 years before enrollment were included at 5 centers in Argentina between 2013 and 2014. Demographic and socioeconomic characteristics were collected through a questionnaire. Blood samples were tested for anti-HAV antibodies. Antibody values ≥10 mIU/mL were considered seroprotective. Logistic regression analysis was performed to evaluate the association between demographic and socioeconomic variables and seroprotection.RESULTS:
A total of 1088 children were included, with a median postvaccination interval of 7.7 years (range 6.3-9.2 years). Of these children, 97.4% (95% confidence interval 96.3%-98.3%) had protective antibodies against HAV. No association between demographic or socioeconomic variables and seroprotection was found. Geometric mean concentration of antibody levels against HAV was 170.5 mUI/mL (95% confidence interval 163.2-178.2 mUI/mL).CONCLUSIONS:
Single-dose universal hepatitis A immunization in 1-year-old children resulted in sustained immunologic protection for up to 9 years in Argentina. These findings, along with the low current disease burden, confirm the success of the intervention.
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Colección:
01-internacional
Base de datos:
MEDLINE
Contexto en salud:
2_ODS3
Problema de salud:
2_enfermedades_transmissibles
Asunto principal:
Vacunas contra la Hepatitis A
/
Virus de la Hepatitis A
/
Anticuerpos de Hepatitis A
/
Hepatitis A
Tipo de estudio:
Observational_studies
/
Prevalence_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Child
/
Female
/
Humans
/
Infant
/
Male
País/Región como asunto:
America do sul
/
Argentina
Idioma:
En
Revista:
Pediatr Infect Dis J
Asunto de la revista:
DOENCAS TRANSMISSIVEIS
/
PEDIATRIA
Año:
2016
Tipo del documento:
Article