Can you reinfect yourself with your own stomach virus? Iv had d for 4 days and think I'm at the end of it now. However my mind is racing.. Earlier I went to the loo and had d. I cleaned myself up. But before I could wash my hands I sneezed and put my hands on my mouth. If Iv ingested the virus that's made me bad the last few days, am I immune to it now? Or can I become ill again?