AIDS is a chronic infectious disease caused by human immunodeficiency virus infection and is commonly transmitted through unclean sexual contact, exposure to blood and body fluids, and vertical transmission from mother to child. Other diseases with similar transmission routes to AIDS include the following: First, viral hepatitis, especially hepatitis B and C, can also be transmitted through sexual, blood, and body fluid contact, and can also cause vertical transmission from mother to child. In addition, some sexually transmitted diseases, such as syphilis, gonorrhea, etc., can cause infection through unclean sexual contact. AIDS is also known as a sexually transmitted disease because there are certain pathogens in the body fluids during sexual contact that cause infection through the broken mucous membrane. Knowing how the disease is transmitted can help to develop further preventive measures to cut off the transmission route and prevent the corresponding disease.