Derek Smith, a 31 y.o., Caucasian male injection drug user, who is homeless, presents to the ED with a chief complaint of shortness of breath. He describes a 1-month history of intermittent fevers and night sweats associated with a nonproductive cough.

From the above scenario, Mr. Smith is most likely suffering fromhuman immunodeficiency virus (HIV).Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threateningcondition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight the organisms that cause disease. HIV is a sexually transmitted infection (STI). HIV is a virus spread through certain body fluids that attacks the body’s immune system, specifically the CD4 cells, often called T cells. Over time, HIV can destroy so many of these cells that the body can’t fight off infections and disease. These special cells help the immune syste

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