Selective antibody deficiency to bacterial polysaccharide antigens in patients with Netherton syndrome.

Three patients with Netherton syndrome, recurrent sinopulmonary infections, and humoral immune deficiency are described. Although quantitative serum immunoglobulin levels were generally normal, two patients had selective antibody deficiency to bacterial polysaccharide antigens, one associated with IgA-IgG-2 deficiency. A third patient had an antibody deficiency to protein antigens. This is the first report, to our knowledge, that describes antibody deficiency in patients with Netherton syndrome. This finding demonstrates the importance of evaluating functional antibody responses to both protein and bacterial polysaccharide antigens and not relying on IgG subclass determination.