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2.  HIV: human immunodeficiency virus  AIDS (acquired immune deficiency syndrome): weakened immune system caused by the infection of HIV HIV ≠ AIDS

4.  Infects helper T-cells and macrophages (CD4 protein receptor cells) Why is this so bad?

5.  Transmission: through fluid containing the virus or cells with the virus  Fluid: blood, semen, vaginal fluids, breast-milk

6.  Most common way of contraction  Sexually  Sharing of needles  Breast-feeding

7. AIDS

8.  Phase I: (asymptomatic) few or no symptoms  Phase II: worsening of symptoms  Phase III: T-cell count drops bellow 200 cells/mL (normal 600-700) onset of AIDS.

9.  Opportunistic infections: diseases that only strike because of a weakened immune system EX. Kaposi’s sarcoma, candidiasis, taxoplasmosis, tuberculosis, pneumonia

11.  Mutates and evolves very quickly which makes it difficult to make a vaccine  Treatment consists of “cocktails” with some patients taking up to 50 pills/day (very expensive)

12. AIDS