根据病原菌与宿主细胞的关系，病原菌分为胞外菌和胞内菌两类。胞外菌是指可以在宿主细胞外的细胞间隙、血液、淋巴液、组织液等体液中生长繁殖的细菌，它们在体外可以在没有活细胞的人工培养基中生长。胞内菌又分两种，即兼性胞内菌和专性胞内菌。兼性胞内菌是指在宿主体内，主要寄居在细胞内生长繁殖，在体外无活细胞的培养基中亦可生长。专性胞内菌则不论在体内体外，都必须在活细胞内生长繁殖。点击此处添加图片说明
本病特点是病人有严重细胞免疫缺陷，因而失去抗病毒和抗细菌能力，常合并感染和某些恶性肿瘤而导致死亡。
The disease is characterized by immune cells of patients with serious defects, which lost anti-virus and anti-bacteria capacity, often with infection and certain malignancies and leading to death.
大蒜和松果菊属植物都是既抗病毒又抗细菌，甘草也具有极佳的增强免疫的功能。
Both garlic and echinacea are antiviral and antibacterial and liquorice is a good immune system enhancer.
霉酚酸钠是霉酚酸的一种衍生物，具有抗病毒、抗细菌、抗真菌、抗肿瘤、免疫抑制等优点。
Mycophenolate sodium was prepared from Mycophenolic acid. It has the advantages of anti-viral, anti-bacterial, anti-fungal, anti-tumor and immunosuppressive.
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