AIDS and HIV (PowerPoint) by dfhdhdhdhjr

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									                   What is HIV?




• Human Immunodeficiency Virus
• Cause: Retrovirus
• Problem: White blood cells of the immune system
  are slowly destroyed
  – Immune system normally fights infection
  – Infected persons unable to fight common illnesses
               • Type of RNA virus that
Retroviruses     contains the enzyme
                 Reverse Transcriptase
               • 1) Virus RNA is injected
                 into cell
               • 2) Ribosome uses virus
                 RNA to create virus DNA
               • 3) Virus DNA combines
                 with cell DNA (becomes
                 latent)
               • 4) Once active, normal
                 steps of
                 transcription/translation
                 followed
    How is
     HIV
  Contracted?
• High risk activities:         • Low risk activities:
• 1) Sex (oral, vaginal,        • 3) Mother to child in
  anal)                           womb
• 2) Sharing needles            • 4) Breast milk
  (tattoos, piercings, drugs)   • 5) Blood
                                  transfusions
              • Length of time to show
HIV   Symptoms symptoms varies among
                infected
              • Infected person may
                look normal for years
              • Weight loss
              • Fatigue
              • Diarrhea
              • Cough
              • Swollen lymph nodes
              • Skin rashes and sores
                (mouth, genitals, anal
                area)
              • Yeast infections (girls)
   What is AIDS?




• Acquired Immunodeficiency Syndrome
• AIDS results when:
   – 1) Less then 200 CD4 T cells per 1mm³ blood
   – 2) Multiple symptoms/infections from HIV appear
• Therefore, the HIV virus causes the disease AIDS
     Prevention
• 100% Effective: Abstinence
  (not participating in sexual
  acts)
• If sexually active: Latex
  condoms effective when used
  properly
• Fact: Latex condoms are the
  only forms of birth control that
  protect against STDs
• If drug user: Change needles
        Quick Review
• HIV is an RNA retrovirus
• When HIV attacks the immune system,
  many physical symptoms occur
• HIV/AIDS can be prevented with the
  proper use of abstinence or latex
  condoms

								
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