In fact, reduced resistance to disease is not uncommon and may accompany sclerosis of the liver, uremia, or other diseases. Transplant recipients have their resistance deliberately reduced to reduce the chances of rejection.
其實，「後天免疫不全」並不罕見，尿毒症、肝硬化、全身性紅斑狼瘡，乃至於長期服用免疫抑制劑的臟器移植者，都會導致體內免疫力（抵抗力）的降低。