function MM_findObj(n, d) { //v4.01 var p,i,x; if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) { d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);} if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i 2) { if ((img = MM_findObj(args[2])) != null && !img.MM_init) { img.MM_init = true; img.MM_up = args[3]; img.MM_dn = img.src; if ((nbArr = document[grpName]) == null) nbArr = document[grpName] = new Array(); nbArr[nbArr.length] = img; for (i=4; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) { if (!img.MM_up) img.MM_up = img.src; img.src = img.MM_dn = args[i+1]; nbArr[nbArr.length] = img; } } } else if (event == "over") { document.MM_nbOver = nbArr = new Array(); for (i=1; i < args.length-1; i+=3) if ((img = MM_findObj(args[i])) != null) { if (!img.MM_up) img.MM_up = img.src; img.src = (img.MM_dn && args[i+2]) ? args[i+2] : ((args[i+1])?args[i+1] : img.MM_up); nbArr[nbArr.length] = img; } } else if (event == "out" ) { for (i=0; i < document.MM_nbOver.length; i++) { img = document.MM_nbOver[i]; img.src = (img.MM_dn) ? img.MM_dn : img.MM_up; } } else if (event == "down") { nbArr = document[grpName]; if (nbArr) for (i=0; i < nbArr.length; i++) { img=nbArr[i]; img.src = img.MM_up; img.MM_dn = 0; } document[grpName] = nbArr = new Array(); for (i=2; i < args.length-1; i+=2) if ((img = MM_findObj(args[i])) != null) { if (!img.MM_up) img.MM_up = img.src; img.src = img.MM_dn = (args[i+1])? args[i+1] : img.MM_up; nbArr[nbArr.length] = img; } } } function MM_preloadImages() { //v3.0 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array(); var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i

    3.3 Early symptom stage (stage C)  Along with progressive injury to the immune system, various non-health indications and slight opportunistic infection appear. Laboratory examination has shown reduction of platelets and haemoglobins except the reduction of leucocyte count.
    3.4 Late symptom stage C AIDS (stage D)
    This stage is also called complete stage of AIDS, mainly manifested as opportunistic infection, malignant pathological changes and multiple system injuries caused by immune function failure.
    Developed from HIV infection to AIDS, the symptoms varies with individual cases. In Kenya, a group of Prostitutes was tested for HIV infection and found that in 136 cases, HIV antibody has turned from original negative to positive, and monitored and followed up for 5 years from that time, 68 cases were still without any clinical symptom, and 56 cases suffered from relevant syndrome or died of AIDS.
    4.What are the factors that influence the attack?
    There are many factors that influence the development into AIDS, the duration of Incubation period and the survival time after being infected by AIDS.
    4.1Characteristics of virus The characteristics of HIV are closely related to the attack of AIDS. After HIV has infected human body, the RNA of the virus, by the action of reverse transcriptase, is synthesized into DNA, and then integrated on to cell chromosome for long-term latency there. Only some special active factors act on the Provirus that has integrated into cell genes, can the virus start its expression, or converts from low-level expression to high-level expression. The high-level expression can kill cells immediately, low-level expression can lead to progressive injury to cells and non-expression integrates HIV into cell chromosome to co-exist with the cell. This is why the clinical incubation period and course of disease of AIDS are very different.
    4.2Age Of newborns vertically infected with HIV, about 75% will die 3 months after birth, and of babies being attacked 12 months after birth, about 95% will die before 3 years old. This shows the incubation period of HIV vertically transmitted between mother and children is very short and the progress of disease very quick. As for the progress of disease for adults infected with HIV, some studies show that the incidence each year of patients infected after 20 years old is 3 times that of patients infected after 40 years old. The reason may be that in the younger, the metabolism trends to be strong, and along with the hyperplasia of infected cells, the activation and replication of HIV is quickened, which expedites the damage to the immune system of the organism.
    Male AIDS patients are mostly homosexual population, and after being attacked, are commonly accompanied with Kaposis sarcoma and infectious mycotic infection, while the females are often infected through heterosexuality, complicated with salmonella infection, pelvic inflammation and progressive multiple encephalitis. Making a comparison between the male and the female, the average livability for males after being sick with AIDS is 12.9 months and for females 14.9 months.
    4.4Social behavior If a patient, after being infected with HIV, continues to take drug and has several sex partners, the course of illness will be quickened because drug taking may lower the immune function of the mechanism. In addition, drug taking or drug injecting may increase sexuality, and excessive sex may increase the risk of sexually transmitted disease. Prostitution and drug taking are closely related. A prostitute who takes drugmay have high-risk sexual contact, such as anal and vagina sex with intravenous drug users for the purpose of getting drug. Study shows that compared with homosexual population, intravenous drug users not only have a higher incidence but also a faster progress of illness.
    4.5Nutritional and economic situation The spread of AIDS was first found in USA, and before 1993, the number of AIDS in the America ranked first in the world. Thereafter, the cases of AIDS increased rapidly in Africa and Asia, and up to June 1998, 2/3 of 30.6 million people infected with HIV in the world occurred in Africa. Africa is backward in economic development, and the poverty and extreme disparity between the rich and the poor make HIV easy to spread among the poor population there. Due to malnutrition and other factors, the mortality of AIDS in Africa is significant higher than that of developed countries. American National Health Statistics Center reported that the mortality of AIDS in 1997 was lowered 47% as compared with 1996. In 1996, AIDS ranked eighth in the diseases that lead to death of Americans, while in 1997, it ranked fourteenth. At the highest AIDS infection age between 25-44, AIDS was the first crime culprit in 1995, while in 1997, it declined to the fifth cause of death. The decrease of mortality of AIDS is closely related to the strengthening of propaganda and education, change of risk sexual behavior and application of antivirus medicines and immunomodulators. But in Africa, because most HIV-infected patients have been deprived of treatment and proper nutrition owing to poor economic situation, the HIV infection rate and mortality have remained high.
    concurrent infection 4.6Along with the progressive decrease of T lymphocytes and the lowering of immune function, HIV-infected patients will be much more susceptible to various kinds of viral, parasitic, bacterial and mycotic infection. However, once opportunistic infections occur, it will quicken the maladjustment of immune function. Giant cell virus and HIV were cultured in vitro simultaneously to infect T lymphocyte, and it was found the infection will expedite the replication of HIV. Patients with AIDS are also concurrently infected by herpes simplex virus. Cell culture in vitro has confirmed that the HIV of herpes simplex virus can cause overlapping infections of cells and strengthen the replication of HIV. EB virus infection is closely related to AIDS, and it has been found EB virus infection can worsen the clinical symptoms of AIDS.
    After being infected with HIV, most patients will be ill for heir life. But the progress of ill can be slowed and survival time can be prolonged if anti-virus medicines and immunomodulators are used, sound living life style adopted to prevent opportunistic infection, risk sexual contact stopped, diseases transmitted in treatment avoided and various concurrent diseases treated in time.