Viruses are non-cellular forms composed of nucleic acid molecules and proteins and survive mainly by parasitism in living cells. There are many different types of viruses, so different viruses have different survival times after leaving the body. Generally speaking, viruses are resistant to cold but not heat. Viruses can survive in the refrigerator for days, months or even years, while they are inactivated after a few minutes of heating and boiling. However, different types of viruses have different tolerances to the external environment, for example, the AIDS virus is mainly parasitic on the body’s lymphocytes, the virus is sensitive to heat, when leaving the body in a dry environment, usually survives for less than 2 hours. Herpes virus is more sensitive to external environmental stimuli, so the herpes virus can only survive for a few minutes after leaving the body. In contrast, hepatitis viruses are more resistant to the outside world and can tolerate UV light and low temperatures better, so hepatitis viruses can survive at room temperature for about 7-10 days. In short, most viruses are sensitive to disinfectants and so on, and usually ordinary disinfectant water can play a good role in killing the virus.