Norovirus

Norovirus (or "winter vomiting disease") is a common cause of gastroenteritis.
It causes non-bloody diarrhea, vomiting, and stomach pain. You have to drink lots of water.
Risk factors include unsanitary food preparation. Diagnosis is generally based on symptoms.
Wash your hands properly. Disinfect contaminated surfaces. There is no vaccine or specific treatment for norovirus.
Norovirus results in about 685 million cases of disease and 200,000 deaths globally a year. It is common.
Those under the age of five are most often affected, and in this group it results in about 50,000 deaths in the developing world. Norovirus infections occur more commonly during winter months. It often occurs in outbreaks, especially among those living in close quarters. In the United States, it is the cause of about half of all foodborne disease outbreaks. The virus is named after the city of Norwalk, Ohio, US where an outbreak occurred in 1968.