Norovirus is a small, spherical virus that causes food poisoning. Noroviruses are classified into five groups according to their genetics, and it is groups I and II that infect humans. Norovirus is very contagious; 10 to 100 virus particles are enough to cause an infection. The virus multiplies inside cells in the human intestines.
Did You Know There Are Quick Tests for Infectious Diseases?Norovirus: pathogen and clinical presentation
The time from infection until the development of symptoms—that is, the incubation period—is 24 to 48 hours. The principal symptoms are vomiting, diarrhea, and abdominal pain, with vomiting and diarrhea occurring several times a day, sometimes more than 10 times a day. Symptoms subside in three to four days but can be prolonged in the case of severe dehydration.
If you develop these symptoms, it is important to get checked at a hospital as soon as possible.