Backgroud Acquired immune deficiency syndrome (AIDS) was caused by human immunodeficiency virus (HIV), and it is a serious chronic contagious disease and could not be cured.

• 背景与目的 艾滋病是获得性免疫缺陷综合征(acquired immune deficiency syndrome，AIDS)的简称，它是由于感染了人类免疫缺陷病毒(human immunodeficiency virus，HIV)后引起的一种无法治愈的致死性慢性传染病。