Stomach Bug 2024 Summer Season. Norovirus, the highly contagious stomach bug that causes vomiting and diarrhea, is still spreading in the united states. Cases of the stomach bug known as norovirus have been rising across the united states, according to the centers for disease control and prevention.

What norovirus isn’t, however, is the stomach flu — despite what you might read or hear to the contrary. A colorful bug that moves quickly across the ground.