Stomach Flu 2024. Stomach flu is a viral infection that affects your stomach and intestines. Viral gastroenteritis (stomach flu) is a highly contagious intestinal infection that causes watery diarrhea, stomach cramps, and vomiting.
The flu is caused by. Norovirus, the extremely contagious illness that causes vomiting and diarrhea, has surged in the northeast region of the united states in the past few weeks,.