Stomach Flu 2024. The stomach flu is an infection of the stomach or intestines, but influenza is an infection of the nose, throat, or lungs. Find info on norovirus symptoms, causes, prevention, current outbreaks, and reporting systems.

The stomach flu is an infection of the stomach or intestines, but influenza is an infection of the nose, throat, or lungs. So the virus is known as norovirus, commonly referred to as stomach flu, but it’s not related in any way to influenza.