低免疫球蛋白血症病人中抗感染能力明显下降，易产生反复呼吸道感染，严重性与免疫球蛋白降低水平密切相关。选择性抗体缺陷而血清免疫球蛋白水平正常者也可有易感性增加l’］。自6O年代报道了fall亚类以来，对它与呼吸道疾病的关系作了许多研究，本文就此作一综述。IIgG亚类个 In patients with hypoimmunoglobulinemia, the anti-infective capacity is significantly reduced, and it is easy to produce recurrent respiratory infections. The severity is closely related to the decreased level of immunoglobulin. Patients with selective antibody deficiency and normal serum immunoglobulin levels may also have increased susceptibility to l’]. Since the fall subtype was reported in the 1960s, many researches have been done on its relationship with respiratory diseases. This article reviews it. IIgG subclasses