This is a test of commonsense. Complete the next sentence:

How to know if you have a stomach virus
Understand the symptoms of a stomach virus or flu.
This illness affects each area of the gastrointestinal tract. Its symptoms can include nausea and vomiting, diarrhea, abdominal discomfort, and general malaise.
You may have one or all of the symptoms if you have a stomach virus. The illness is self limited, meaning the virus usually runs its course in 2-3 days.