Hydrogen Peroxide kills all known pathogens. I haven't had a cold in 6 years. Food grade 35% a few drops in water daily and you'll never have another cold or flu. Read up on it though--It is dangerous in 35% formula. You must dilute it. I use it for many things--got rid of my warts. I haven't seen a virus or bacteria able to penetrate this as it adds so much oxygen to your system the bad guys can't live in it. Great for Arthritis too. Bathe in it even.