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Vitamin A Supplementation Enhances Infants' Immune Responses to Hepatitis B Vaccine but Does Not Affect Responses to Haemophilus influenzae Type b Vaccine.

Author(s): Newton S, Owusu-Agyei S, Ampofo W, Zandoh C, Adjuik M, Adjei G, Tchum S, Filteau S, Kirkwood BR

Affiliation(s): Kintampo Health Research Centre, Kintampo, Ghana; 4London School of Hygiene and Tropical Medicine, London, UK; 5Noguchi Memorial Institute for Medical Research, Accra, Ghana 6Navrongo Health Research Centre, Navrongo, Ghana.

Publication date & source: 2007-05, J Nutr., 137(5):1272-7.

Vitamin A supplementation reduces child mortality and severe morbidity in less developed countries, and the Expanded Program on Immunization (EPI) offers an ideal opportunity to deliver supplements in developing countries. High-dose vitamin A supplementation has been shown to have no effect on the immunogenicity of oral polio vaccine, tetanus toxoid, pertussis, or on measles vaccine given at 9 mo, but a negative effect on measles vaccine administered at 6 mo and a potentiating effect on diphtheria vaccine. Its effect on the antibody response to hepatitis B and Haemophilus influenzae type b antigens has not yet been established. To assess these effects, the present trial was carried out in the Offinso district of Ghana; 1077 infants were enrolled shortly after birth and randomized either to receive or not to receive 15 mg retinol equivalent with vitamin A together with the pentavalent "diphtheria-polio-tetanus-Haemophilus influenzae b-hepatitis B" vaccine at 6, 10, and 14 wk of age. All mothers received a postpartum supplement of 120 mg retinol equivalent vitamin A as per national policy. Blood samples were taken from infants at 6 and 18 wk of age. The results are based on 888 infants (82.4%) who completed the trial. The vitamin A supplementation did not affect the immune response to Haemophilus influenzae type b, but there was a significant improvement in the immune response to hepatitis B vaccine (93.9 vs. 90.2%, P = 0.04). However, given the high percentage of infants with seroprotection in the control group, it is doubtful that inclusion of vitamin A in the EPI would be justified on these grounds alone.

Page last updated: 2007-05-03

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