The stomach flu isn’t the same as the "flu" caused by influenza, which is characterized mostly by fever, fatigue and respiratory symptoms. The norovirus stomach flu has more focused and intense gastrointestinal symptoms and in most cases, a shorter duration of sickness.
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The most common symptoms are:
While outbreaks can happen anytime and anywhere, they occur most often during the colder months and in crowded environments, like hospitals, nursing homes, childcare centers, schools and cruise ships.
For the overwhelming majority, the illness is usually self-limited, resolving on its own without medical intervention. It’s just not fun to have and can lead to dehydration quickly. Dehydration can be especially worrisome in the elderly and young kids, and it can lead to serious complications.
Because of this, the stomach flu sends about half a million people to the emergency room each year for supportive care and to rule out other more ominous diagnoses, like appendicitis.
The stomach flu isn’t the same as the "flu" caused by influenza, which is characterized mostly by fever, fatigue and respiratory symptoms. The norovirus stomach flu has more focused and intense gastrointestinal symptoms and in most cases, a shorter duration of sickness.
Unlike the respiratory spread of influenza and SARS-CoV-2, norovirus largely spreads from contaminated food and surfaces making it the most common foodborne illness in the U.S.
Foods that are commonly involved in the outbreaks include leafy greens (lettuce), fresh fruit and shellfish. The highly contagious virus typically spreads from unwashed hands (especially after using the restroom and/or vomiting) handling food or surfaces food is placed upon. Also, norovirus can remain viable on surfaces and still infect people for days if not cleaned appropriately. Aggressive handwashing and keeping surfaces unsoiled are key to helping reduce the spread of this pesky virus.
There is some short-term protective immunity following the stomach flu. However, there are over two dozen strains of norovirus known to infect humans, all with many variants so protection from one does not necessarily protect from another.
Of such, it is nearly impossible to avoid the illness once an outbreak does occur. To decrease the risk of infection and further spread of the havoc-wreaking virus, be sure to:
Each year, one in every 15 individuals in the U.S. will get norovirus stomach flu; it’s hard to avoid. If you do get sick, make sure to stay in touch with your doctor and drink plenty of fluids to decrease the risk of dehydration and the consequences of fluid depletion. Do what you can to stop the spread by keeping contaminated surfaces clean and avoiding group setting until 48 hours after symptoms have completely resolved.