取決於環境，但被傳染的機率極小

http://www.aidsmap.com/Survival-outside-the-body/page/1321278/

• In certain conditions, the virus can survive outside the body for several weeks.
• Survival depends on which body fluid it is in, volume of the body fluid, concentration of the virus within it, temperature, acidity, and exposure to sunlight and humidity.
• HIV transmission has not been reported as a consequence of contact with spillages of blood, semen or other body fluids.