HIV
- Created by: Peredur
- Created on: 17-12-13 10:19
View mindmap
- HIV / AIDS
- HIV (human immunodeficiency syndrome)
- AIDS (acquired immunodeficiency syndrome)
- HIV positive means the HIV virus has been found in your blood by blood tests but you have no symptoms
- The majority of infections occur in southern africa
- HIV is transmitted by
- Sexual contact
- Infection of blood e.g sharing needles
- From mother to foetus
- How does HIV cause AIDS
- 1) HIV attaches to the CD4 receptors of the receptors of the T helper cells and the infects them
- 2) Once inside the host cell it takes over and replicates
- 3) Host T killer cells then kill the infected cells by the mediated response leading to a decrease in the number of T helper cells
- 4) This means that macrophages and T killer cells don't become activated
- Stages of HIV
- 1) Acute HIV syndrome first few weeks of infection mild viral symptoms e.g fevers, headaches
- 2) asymptomatic or chronic stage symptoms disappear, this stage lasts longer in healthy people, HIV replication
- 3) symptomatic disease viral load is so large immune system starts to fail, T helper cell count drop HIV related symptoms occur
- 4) advanced AIDS severe symptoms and infections occur e.g. TB, cancers
- Treatment and control
- No current cure for HIV
- Education on condoms and clean needles can reduce the spread of disease
Comments
No comments have yet been made