Stomach flu, formally known as viral gastroenteritis, is infection of intestines. This infection develops when an individual consumes contaminated food or water. This condition presents with nausea, vomiting, abdominal cramps and low-grade fever. Stomach flu severely infects infants, elderly and immunocompromised individuals. It may prove fatal in many cases. Unfortunately, there is no treatment for viral gastroenteritis. The only way away from it is prevention.