Stomach Flu 2024 Canada Today. Gastroenteritis can be caused by viruses, most commonly norovirus, bacteria and parasites. Flu season may be winding down, but health officials are noting a rise of norovirus in canada, the nasty stomach bug that can cause severe gastrointestinal symptoms.

It is a common cause of vomiting and diarrhea each winter and is often referred to as ‘winter vomiting. An infected person may also have a fever, headache, fatigue, body aches, chills and.