Acquired Immune Deficiency Syndrome (AIDS)
AIDS (acquired immunodeficiency syndrome) was first reported in the United States in 1981. It is caused by the human immunodeficiency virus (HIV), a virus that destroys the body's ability to fight off infection.

An estimated 900,000 people in the United States are currently infected with HIV. People who have AIDS are very susceptible to many life-threatening diseases, called opportunistic infections, and to certain forms of cancer. Transmission of the virus primarily occurs during sexual activity and by sharing needles used to inject intravenous drugs

Chancroid
Chancroid ("SHAN-kroid") is an important bacterial infection caused by Haemophilus ducreyi, which is spread by sexual contact. Periodic outbreaks of chancroid have occurred in the United States, the last one being in the late 1980s. These outbreaks are

[1] [2] [3] [4] [5] [6] [7] [8] [9] 下一页