Alcohol usually has a certain killing effect on viruses, and attention should be paid to the concentration of alcohol when it is used to kill viruses. Virus is usually composed of protein shell and nucleic acid, alcohol has a certain effect on protein, can make protein denaturation. In the use of alcohol to kill the virus, usually choose 75% alcohol, the concentration of alcohol on the virus protein shell to kill the strongest, so the best results. If the concentration of alcohol is too high, it may form a protective film on the surface of the virus, thus failing to kill the virus completely. If the concentration is too low, it may not be able to completely inactivate the virus, and the effect is also unsatisfactory. High-concentration alcohol is a flammable liquid, and care should be taken not to contaminate open flames when using alcohol to kill viruses, so as to prevent fires.