when the immune system is weakened, the body cannot fight off disease
DESCRIPTION
When the immune system is weakened, the body cannot fight off disease. HIV- H uman I mmunodeficiency V irus. Causes AIDS Retro virus (contains RNA) Attacks Helper T-cells Came from butchering chimps (mutated SIV). HIV Structure. Protein. RNA. Capsid. Reverse Transcriptase. - PowerPoint PPT PresentationTRANSCRIPT
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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
CapsidRNA
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 celldeadT cell
antibody
activatedB 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