Norovirus Cases Spike Across Canada: Health Experts Share Key Prevention Tips
Canadian health officials are reporting a sharp increase in cases of norovirus, a highly contagious gastrointestinal illness often called the “winter vomiting disease.” Experts warn that young children and seniors are most at risk of severe complications.
Dr. Zain Chagla, an infectious disease specialist at St. Joseph’s Healthcare in Hamilton, Ontario, highlighted the seasonal nature of the virus, noting a return to pre-pandemic patterns. “We’re seeing more cases across Canada and the United States, which is typical during this time of year,” Dr. Chagla told CTV Your Morning.
According to the BC Centre for Disease Control (BCCDC), norovirus cases are more common in winter and early spring when people spend more time indoors. Symptoms include:
- Vomiting
- Diarrhea
- Stomach pain
- Nausea
The virus spreads through close contact with infected individuals, contaminated food, or surfaces. Symptoms usually last 24 to 72 hours, but severe dehydration can lead to hospitalization, particularly for vulnerable populations like young children and the elderly.
Preliminary data from the Public Health Agency of Canada (PHAC) indicates a rise in cases across Alberta, Ontario, British Columbia, Nova Scotia, Saskatchewan, and Prince Edward Island. While numbers appear higher compared to the 2019–2023 period, PHAC attributes this to reduced reporting during the COVID-19 pandemic.
For instance, Alberta reported 654 cases in 2024, up from 513 in 2023 and 295 in 2022. Similarly, British Columbia is seeing “elevated levels of illness,” according to the BCCDC. Meanwhile, Saskatchewan has confirmed norovirus outbreaks in two long-term care homes, which health officials call “typical” for this season.
There is no specific treatment for norovirus. Dr. Chagla advises those experiencing severe symptoms, such as significant fluid loss, to seek medical care. Small sips of electrolyte solutions like Gatorade or Pedialyte can help manage dehydration during the acute phase, which lasts about 24 hours.
“Most healthy individuals can tolerate the illness and recover within a few days,” Dr. Chagla reassured.
To prevent the spread:
- Wash hands frequently with soap and water.
- Avoid sharing food or drinks.
- Disinfect commonly touched surfaces.
- Stay home if experiencing symptoms.
Older adults and young children face the highest risk of severe dehydration and complications. Health officials stress the importance of early hydration and vigilance to avoid outbreaks in high-risk environments like long-term care homes.
Norovirus is most contagious during the initial onset of vomiting and diarrhea. “Just 15 viral particles can infect someone,” Dr. Chagla explained. Even after symptoms resolve, individuals may still shed the virus for days.
As Canada experiences an upswing in norovirus cases, health experts emphasize the importance of hygiene, early symptom recognition, and hydration to manage and prevent outbreaks.