What is aids - acquired immunodeficiency syndrome first information about the acquired immunodeficiency syndrome (AIDS, aids in English) appeared in the mid 80-ies of the last century, when doctors found an unknown to the moment condition in which adults suffered from immunodeficiency, until this occurs only as a congenital defect in preterm infants. Doctors have found that these patients decreased immunity - immune deficiency - was not congenital, but was acquired in adulthood. Therefore, the disease in the first years after its discovery became known as aids - acquired immune deficiency syndrome. Since then, the spread aids has reached epidemic levels. According to recent data, there are currently about 40 million patients, and the number of victims of the disease over 20 years of its existence is nearing 20 million. Contagiousness of aids, its rapid distribution and incurable and earned him fame, "the plague of the twentieth century, the most terrible and incomprehensible viral disease of modernity. Fairly quickly was determined and the viral nature of the disease.
The virus that causes immunodeficiency syndrome, named hiv - human immunodeficiency virus. In the early days after infection with the human body opposes hiv, which does not manifest itself, but it gradually destroys the immune system HIV-infected person. Finally comes a stage at which the patient immune to such an extent weakened that any infection from which hiv infection to the patient's body could have done it without the slightest problem can become fatal. When struck by the immune system, the human body becomes completely defenseless against a relatively harmless microorganisms, as well as malignant tumors.