HIV/AIDS EpidemicHIV/AIDS is a huge epidemic that still affects society today. The lack of knowledge and technical progress has caused an increasing number of cases. It has spread around the world since the 1940s, pushing countries to unite in the fight against AIDS. Despite all the campaigns carried out, the number of cases continues to increase. Countries have divided the disease into three types to make it easier to distinguish the effects of AIDS on different regions of the world. As well as which subtypes germinate from which areas. HIV/AIDS can be spread in different ways. The future is still uncertain for victims whose lives have been radically changed by this deadly disease. It started in 1940 when the virus jumped from an animal to a human, it came from either a monkey or a chimpanzee. A man still unknown today went to a hospital in Léopoldville, Africa, now known as Kinshasa. The stranger donated blood at a clinic for a study on blood diseases. It was then frozen in a test tube and forgotten. Nearly a quarter of a century later, in the mid-1980s, scientists re-examined blood because of the growing AIDS epidemic. They discovered that the man carried the HIV virus which causes AIDS. AIDS has several different subtypes of the virus, all of which can be traced back to the Léopoldville man. The variety of types makes it difficult to find a cure for the disease, as it is constantly changing and mutating. The President of the United States and the Prime Minister of France announced in 1987 that they would join forces to combat this problem. The virus has been divided into three types. Model 1 is the AIDS type in North America, Western Europe, Australia and New Zealand. In these parts of the world, AIDS is spread primarily through homosexual sex and most often affects homosexual and bisexual men. The number of cases linked to blood transfusions has decreased significantly thanks to routine screenings. Sharing of needles by intravenous drug users appears to be becoming a major problem as it helps accelerate the spread of the disease. Since gay and bisexual men appear to be at greater risk of contracting the virus, the male-to-female ratio is 20:1 in model countries 1..