75% alcohol for many viruses have a killing, inactivating effect, 75% alcohol has the best disinfection effect, high or low concentration will affect the killing effect, too high concentration for bacteria have a destructive effect, but the alcohol concentration is too high, may have a coagulation effect on the outer membrane of bacteria, it is difficult to enter the bacteria inside to kill pathogens, in principle, only 75% concentration of alcohol has a killing effect. If the concentration of alcohol is higher than 75%, it can be appropriately mixed with water and adjusted to 75% of the alcohol concentration. If the concentration is lower than 75% to achieve a good killing effect, including the daily consumption of alcoholic beverages, wine, may not achieve the best killing effect. In addition, in the use of alcohol or their own modulation of alcohol, be aware that alcohol is flammable items, must be careful of the possibility of combustion, explosion. Content source: Dr. Yau Lai