In early December, the Centers for Disease Control and Prevention (CDC) reported a significant surge in norovirus cases, with the number of incidences doubling compared to previous years. During the week of December 5, there were 91 reported cases of norovirus, also referred to as the stomach flu, which is alarmingly more than the highest levels seen from 2021 to 2024. This alarming trend coincides with a statement from the Minnesota Department of Health highlighting a considerable rise in stomach flu cases within the state.
Norovirus, known for causing gastroenteritis—an inflammation of the stomach and intestines—remains the leading cause of vomiting and diarrhea in the United States and is responsible for 58% of foodborne illnesses. Recently, this virus has been linked to outbreaks at food events and on cruise ships. Notably, over 80 attendees fell ill at a Los Angeles event after consuming potentially contaminated oysters. The U.S. Food and Drug Administration has already issued advisories for oysters from British Columbia, urging caution.
Additionally, cruise ships have been reporting outbreaks as well, with over 80 passengers and crew members falling ill on a Holland America Line cruise earlier this month. Symptoms presented include the hallmark vomiting and diarrhea as the illness runs its course.
Certain age groups are especially vulnerable to norovirus infections, with children under five and seniors over 85 years old being at a higher risk of severe illness. The CDC estimates nearly a million pediatric visits to medical facilities each year are due to norovirus.
Symptoms typically appear one to two days post-exposure, lasting about one to two days. While many display clear symptoms, some may remain asymptomatic but still contagious. The virus primarily spreads through contaminated food or water, direct contact with infected individuals, or touching contaminated surfaces.
For those infected, staying hydrated is crucial as the CDC advises consuming plenty of fluids and avoiding antibiotics, which do not combat the virus. The CDC recommends staying home for at least two days after symptoms improve to help stem the virus’s spread. Preventative measures include frequent handwashing, disinfecting surfaces, and careful food handling.
In light of the reported rise in norovirus cases, understanding the virus’s symptoms and modes of transmission can empower individuals to protect themselves and others effectively. Through awareness and preventative actions, the spread of this highly contagious illness can be mitigated, providing a hopeful outlook for public health as we navigate through peak seasons for gastrointestinal illnesses.