75% medical alcohol kills novel coronavirus, 95% medical alcohol does not kill novel coronavirus. 75% medical alcohol can make protein coagulation penetration, can effectively kill the new coronavirus outside the body. In daily life, using 75% medical alcohol to disinfect table tops, chairs, door knobs and other items, wounds, as well as routine skin disinfection, is able to achieve the effect of killing the new coronavirus, and play a role in preventing infection with the new coronavirus. 95% medical alcohol disinfection effect is lower than 75% medical alcohol, its concentration is too high, will form a protective film on the surface of the bacteria, so that the alcohol can not enter the body of the virus, the effect of killing the virus is naturally reduced. 95% medical alcohol is usually used to clean ultraviolet lamps, camera lenses and other equipment, but also used for fuel for alcohol lamps, and can not be used as a virus-killing disinfectant. Whether it is 75% medical alcohol or 95% medical alcohol, are flammable, storage and use should be prevented during the fire.