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Biology IBS2 Block F Oct.2.2009 Ji Won Lee Jun Lee Aaron Savidge.

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Presentation on theme: "Biology IBS2 Block F Oct.2.2009 Ji Won Lee Jun Lee Aaron Savidge."— Presentation transcript:

1 Biology IBS2 Block F Oct.2.2009 Ji Won Lee Jun Lee Aaron Savidge


3 AIDS is caused by HIV. HIV is a virus that gradually attacks immune system cells. As HIV progressively damages these cells, the body becomes more vulnerable to infections, which it will have difficulty in fighting off. It is at the point of very advanced HIV infection that a person is said to have AIDS. It can be years before HIV has damaged the immune system enough for AIDS to develop..

4 HIV causes AIDS by directly 1) inducing the death of CD4+ T cells or 2) interfering with their normal function, and by 3) triggering other events that weaken a person’s immune function. Once it enters the body, HIV infects a large number of CD4+ cells and replicates rapidly. During this acute or primary phase of infection, the blood contains many viral particles that spread throughout the body, seeding various organs, particularly the lymphoid organs.


6 Two to 4 weeks after exposure to the virus, up to 70 percent of HIV-infected people suffer flu-like symptoms related to the acute infection. Their immune system fights back with killer T cells (CD8+ T cells) and B-cell-produced antibodies, which dramatically reduce HIV levels. A person’s CD4+ T cell count may rebound somewhat and even approach its original level.killer T cells (CD8+ T cellB-cellantibodies A person may then remain free of HIV-related symptoms for years despite continuous replication of HIV in the lymphoid organs that had been seeded during the acute phase of infection.

7 Acquired Immunodeficiency Syndrome Is a collection of symptoms and infections caused by infection with the human immunodeficiency virus (HIV). Transmission: Blood, semen and even breast milk. Carried through: 1)Anal sex, 2)Needle sharing, 3)vaginal sex 4)Even passed on through pregnancy

8 1. Anal sex: Highly risky Person who receives the semen is at greater risk Person who inserts penis is also at risk Small lining of the wall

9 2. Needle Sharing: Sharing needles and or syringes Now blood donating is screened Most probable of getting infection as it is directly into the blood stream.

10 3. Vaginal sex: Male at less risk. Man can still be infected Again, the woman will become infected because of semen. Cuts, braises, scabs on penis can also transmit the disease.

11 4. Oral sex: No one knows how bad the degree of risk is Less than unprotected anal sex or vaginal sex Again, person who is giving oral sex, cuts in mouth, sores etc.

12 People with AIDS will experience the following: Trouble getting a job Trouble getting health insurance Paying expensive treatment Trouble with starting a family They will become discriminated or experience discrimination They will have a stigma Children with AIDS will be denied education Experience denial

13 The society will experience the following because of AIDS: The need for bigger economic costs Increase in orphan numbers Loss of labor Erosion of morale or weakened confidence in the future A higher need for information distribution about AIDS

14 Avert. 15 Sept. 2009. Web. 25 Sept. 2009.. HIV vaccine: five damaging Aids myths. 24 Sept. 2009. Web. 29 Sept. 2009.. What is AIDS? 2007. Web. 24 Sept. 2009.. "Transmission of HIV and AIDS." ARAS Home Page Has Moved. Web. 29 Sept. 2009.. "Vertical transmission of HIV through breast milk most likely to occur soon after birth -- Gottlieb 319 (7210): 594 -- BMJ." Web. 29 Sept. 2009.. "HIV and AIDS Tutorial." The Biology Project. Web. 01 Oct. 2009..

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