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[Immunoglobulins A, M, G, and E in children with acute viral respiratory diseases and the croup syndrome].

Children with croup appearing in the presence of acute viral respiratory diseases (AVRD) show an increase in the IgM content in their blood sera during the first days of the disease followed by a decrease, and an increase in the IgG and IgE levels during the convalescence period. No essential shifts in the content of IgA have been observed. The total content of the immunoglobulins in children with croup, was lowered as compared to that in AVPD patients having no croup which is, probably, of a certain pathogenic importance. The increased content of IgE revealed in the blood sera of children with croup indicates the presence of an allergic component in this disease.