Humoral Immunological State in Children with Recurrent Respiratory Infections / 西安交通大学学报(医学版)

ABSTRACT

60 cases with a history of recurrent respiratory infections were studied The serum levels of immunoglobulin G and A were measured by means of radial diffusion and the results were compared with 41 normal subjectsof the same age. In 23 cases (38. 3%), serum IgA level was below meanvalue-SD. It was remarkably decreased in 8 patients with prolonged pneu-monia(P≤0.05). The serum IgG concentration was elevated above mean va-lue + SD in 14 patients, 8 of whom suffered from bronchitis. There was,furthermore, another group of 7 patients with bronchitis whose IgA levelwas elevated above mean value + SD. The results suggested that deficiencyof serum IgA might be a cause of recurrent respiratory infections andmight give rise to a prolonged course of pneumonia in some patients.