Freshly expelled urine is generally not contagious with AIDS. AIDS is a systemic disease caused by infection with the human immunodeficiency virus (HIV). Generally, the amount of HIV in urine is very low, not enough to infect a person with HIV, and once the HIV virus is removed from the infected patient, it is difficult to survive in the air, and the HIV virus in the urine will quickly lose its activity and die, and no longer has the ability to infect other people. HIV is mainly found in blood, semen, vaginal secretions, breast milk, etc., and it is mainly transmitted by sex, blood, and mother-to-child transmission. It is mainly transmitted sexually, through blood, and from mother to child. In daily life, we should pay attention to self-discipline, do not share dental utensils, towels and other toiletries, do not go to irregular clinics for dental repair and filling, do not share needles with others, should have safe sex, avoid multiple sexual partners at the same time, avoid unprotected sex, etc., in order to prevent HIV infection.