Document Detail

Immune response to tetanus booster in infants aged 15 months born prematurely with very low birth weight.
MedLine Citation:
PMID:  22959983     Owner:  NLM     Status:  Publisher    
OBJECTIVES: To compare humoral and cellular immune responses to tetanus booster vaccination in infants born prematurely with those born at full term and identify factors associated with the humoral response. METHODS: A prospective study was carried out on children born prematurely and with a birth weight <1500g and with infants born at full term. At 15 months (pre-vaccination) and 18 months (post-vaccination), anti-tetanus antibodies were measured by ELISA; the intracellular interferon-gamma percentages of CD4+ T and CD8+ T cells after in vitro stimulation with tetanus toxoid were determined by flow cytometry. Chi-squared or Fisher's exact test was used to compare categorical variables. Student's t-test or Mann-Whitney test was used to compare numerical variables. Regression analysis was performed to determine factors associated with humoral immunity. Statistical significance was considered if p<0.05. RESULTS: Sixty-four premature and 54 full-term infants were studied. The proportion of children immune against tetanus at 15 and 18 months was similar in both groups. The geometric mean of the antibodies was lower among the premature children at 15 months (p=0.025) and was similar in both groups at 18 months (p=0.852). The percentages of CD4+ and CD8+ T cells expressing intracellular IFN-γ were similar in both groups at 15 and 18 months. Gestational age <32 weeks was associated with a reduction of -0.116IU/mL in the level of antibodies at 15 months. Breastfeeding >6 months was associated with a 3.5-fold greater chance of optimal protective (≥0.1IU/mL) antibody level against tetanus at 15 months and an increase of 0.956IU/mL in the level of antibodies at 18 months. CONCLUSIONS: Humoral and cellular response following a tetanus booster was similar in both groups. Premature infants exhibited lower levels of anti-tetanus antibodies at 15 months of age, with the lowest levels in those born at a gestational age of less than 32 weeks. Breastfeeding was associated with greater levels of antibody against tetanus.
Maria Cristina Abrão Aued Perin; Carolina Frank Schlindwein; Maria Isabel de Moraes-Pinto; Raquel Maria Simão-Gurge; Ana Flavia de Mello Almada Mimica; Ana Lucia Goulart; Amélia Miyashiro Nunes Dos Santos
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-5
Journal Detail:
Title:  Vaccine     Volume:  -     ISSN:  1873-2518     ISO Abbreviation:  Vaccine     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8406899     Medline TA:  Vaccine     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Ltd.
Department of Pediatrics, Neonatal Division of Medicine, Federal University of São Paulo, São Paulo, SP, Brazil.
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