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Published byBraedon McMillan Modified over 10 years ago
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31.6 Diseases that Weaken the Immune System When the immune system is weakened, the body cannot fight off disease.
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31.6 Diseases that Weaken the Immune System HIV- Human Immunodeficiency Virus –Causes AIDS –Retro virus (contains RNA) –Attacks Helper T-cells –Came from butchering chimps (mutated SIV)
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31.6 Diseases that Weaken the Immune System HIV Structure Capsid RNA Reverse Transcriptase Viral Envelope Protein
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31.6 Diseases that Weaken the Immune System HIV Replication
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31.6 Diseases that Weaken the Immune System Transmission Blood Semen Vaginal Fluids Breast Milk Not Transmitted Air Sweat Saliva Insect bites Tears Urine How Do You Get HIV?
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31.6 Diseases that Weaken the Immune System HIV infection leads to AIDS HIV T cell dead T cell antibody activated B cell –HIV reproduces in and destroys T cells. –Might NOT have symptoms for 10 years! –AIDS victims do NOT die from HIV they die of other diseases
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31.6 Diseases that Weaken the Immune System When Helper T-Cell count drops below 200 per mm³ = Acquired Immune Deficiency Syndrome (AIDS)
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31.6 Diseases that Weaken the Immune System Treatments Antiretroviral drugs- reduces HIV in the body Expensive $$$ No cure but…March 2013 one child was cured!
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31.6 Diseases that Weaken the Immune System HIV/AIDS Statistics (2010) World 34 million infected (3.4 million children) USA 1.1 million infected (1 in 5 unaware) Africa 23 million infected
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