[introduction mode of transmission symptoms -history and present state effects -methods of prevention] AIDS, acquired immune deficiency syndrome in full, is the medical condition which is resulted from the infection of retrovirus HIV (human immunodeficiency Virus), that destroys the immune system of the body. Once the Virus attacks, it begins to destroy some types of white blood cell gradually leaving the victim more and more vulnerable to many other infections that ultimately lead to death. But the complete symptoms of AIDS may not develop for more than 10 years after infection. HIV has certain modes of transmissions. It transmits largely through sexual intercourse with an infected partner. HIV transmissions also occur through medical transfusions of infected blood. But the case is now quite rare because of careful screening of blood supply. It also transmits from an infected mother to her baby who can inherit the virus before or during labour, or through suckling of breasts...