The survival time of HIV (Human Immunodeficiency Virus) outside the body is largely dependent on the environment and can range from a few minutes to several days. The human immunodeficiency virus mainly lives in body fluids such as blood, semen, prostate fluid and vaginal secretion. It is heat intolerant, has low resistance, very poor viability, and does not easily survive away from the human body. If the blade is in a dry or high temperature environment, the virus is generally a few minutes to ten minutes can be quickly inactive, if the blade is immersed in water or in a good test conditions, the survival time of up to 90 hours or more. Under natural conditions, HIV is less stable and less concentrated in the external environment, and generally does not cause infection, so it is not recommended to be too anxious. HIV is mainly transmitted through sex and blood, avoiding high-risk sexual behavior and unclean blood transfusion can effectively avoid HIV infection.