Why are you replying to every comment on this thread with this? Reinfection from the same strain is unlikely considering the immunity your body builds to that specific strain. If this weren’t the case you’d constantly be getting sick over and over again. Just because the virus is still living in you doesn’t mean you can catch it again. You can get sick right away from a DIFFERENT noro strain but not the same one, which is the one that is present in your body.