Humoral immune response was evaluated in children with vitamin A deficiency. The percentage of B lymphocytes and the initial levels of plasma IgA, IgG and IgM were normal. Two weeks after the immunisation with diphtheria and tetanus toxoids, there was a marked increase in the antibody titers. There were no significant differences between the deficient and the normal children. The results indicate that the antibody production is not altered in children with vitamin A deficiency.
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