I was trying to research that specifically and I found an article about an Oregon nursing home that was shut down because of Norovirus (I don't have many details because I was unable to open the complete article) but that article said that alcohol DOES kill the virus. And I also read that in order for the hand sanitizers to be effective, it should take 30 seconds at the lesat for your hands to dry after application. If it takes less than that, then you haven't used enough.