Yes, a person can have a gastointestinal virus without vomiting or diarrhea, but those symptoms are typically the things you get. If you had this virus before or a similar virus, you may only have a mild infection with nausea. You cannot definitively diagnose a Norovirus by symptoms alone, since everyone responds to a viral infection differently.
Yes, it is possible to have a stomach virus without vomiting or diarrhea. Norovirus may have a prolonged infectious period even before a patient starts feeling sick. People who recover from the infection keep shedding virus through their stools for weeks and may potentially spread the infection to others.
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