AIDS is a syndrome, a combination of illnesses. The HIV virus attacks the immune system and leaves the body vulnerable to a variety of life-threatening diseases, so-called opportunistic infections, such as tuberculosis.

• 爱滋病是一种综合病症，爱滋病毒侵害了人体的免疫系统使得人体无法抵御许多危急生命的疾病故称机会感染，比如肺结核。