Impaired Antibody Response toHaemophilus influenzaeType b Polysaccharide and Low IgG2 and IgG4 Concentrations in Apache Children

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Abstract
Because Native American children are at much higher risk for invasive Haemophilus influenzae type b infection than white children, we compared the antibody responses to H. influenzae type b polysaccharide vaccine in healthy Apache and white children.