后天性免疫缺陷综合症,最近主要发现于既往健康的同性恋爱者及血友病者。患者有严重的免疫失调的特微,皮试变态反应消失,淋巴细胞减少,辅助细胞及抑制T细胞比例倒置。免疫异常可并发条件性感染和/或Kaposi氏肉瘤。条件性感染,包括由卡氏肺囊虫(Pneumocystis Carinii),结核枝菌及禽-细胞内分枝杆菌(M.avium-intracellulare), Acquired immunodeficiency syndrome, most recently found in previously healthy homosexuals and hemophiliacs. Patients with severe immune dysfunction subtle, skin test allergy disappeared, lymphopenia, helper cells and inhibit the proportion of T cells inverted. Immune disorders can be complicated by opportunistic infections and / or Kaposi’s sarcoma. Conditional infections include those caused by Pneumocystis Carinii, Mycobacterium tuberculosis and M. avium-intracellulare,