9AIDS---课件.pptVIP

AIDS MADE BY 王勇 季远 于潇华 AIDS There are three parts of our address. The first part is about the mechanism of AIDS . The second part is about the clinical symptom of AIDS. The third part is about the treatment of AIDS . The mechanism of AIDS Made by 于潇华 The mechanism of AIDS The prevailing view about how HIV causes AIDS is that every day the virus makes billions of copies of itself and，in doing so， kills billions of the key defence cells that it infects, a class of T cell known as CD4 cells.These vital cells orchestrate the body’s immune response. The mechanism of AIDS Every day the infected person’s immune system attempts to replace these cells.After years of waging this immunological war,the body eventually fails to keep pace with the virus and the numbers of CD4 cells become dangerously low,leaving the body unable to defend itself against micro- organisms and cancerous cells. The mechanism of AIDS Now some scientists agree that the number of CD4 cells ultimately dwindles,but not because the virus is killing them off.In there view,the virus impairs the body’s ability to produce new CD4 cells,and—critically—it traps existing cells in lymph nodes and other tissues,preventing their movement in and out of the bloodstream. The mechanism of AIDS As large numbers of CD4 cells become trapped in this way,and the body fails to produce a sufficient number of new ones,the dwindling population of circulating cells becomes increasingly restricted in its range and ability to different invading microbes. Part2 The syndrome of AIDS Ji Yuan Syndrome of AIDS HIV infection causes disease manifestations of three principal types An acute viral illness seen in the initial weels of infection and associated with a hige viral load and an intense host immune response Immunologically mediated processes related to host responses to chronic viral infection Opportunistic disease,resulting from impaired host response as the cellular immun