The acquired immunodeficiency syndrome (AIDS) was first recognized in 1981 and is caused by the human immunodeficiency virus (HIV-1).(HIV-2) causes the similar illness to HIV-1 but less aggressive and restricted mainly to western Africa .
HIV Must Be Present:
Infection only occur if one of the persons involved in an exposure situation is infected with HIV. Some people assume that certain behaviors or exposure situations can cause HIV disease, even if the virus is not present…This is not true
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