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Member Research & Reports

Member Research & Reports

Georgia Study Finds Norovirus Symptoms Last an Average of 44 Hours

Norovirus infections—sometimes known as the stomach flu—typically last for the same amount of time, independent of age or the type of norovirus a person is infected with, according to a recent study by the University of Georgia College of Public Health, Emory University, and the Centers for Disease Control and Prevention in the journal Epidemiology and Infection.

(L-R) Theresa Devasia and Dr. Andreas Handel. Photo by Paul Efland.


[Photo: Ms. Theresa Devasia (left) and Dr. Andreas Handel]

Symptoms from a norovirus infection last about two days, a finding that is constant between infected individuals, as well as environmental settings. The incubation period-or time until symptoms start-is also a consistent 1.5 days from time of infection. These findings differ from the authors’ expectations.

“I would have expected there to be a difference in something like a hospital setting or a difference depending on age groups,” said Dr. Andreas Handel, an assistant professor of epidemiology. “But when we analyzed the data, we did not see much of a difference.”

Norovirus infections lead to unpleasant and often severe gastrointestinal problems. The symptoms of a norovirus infection often include vomiting, nausea, diarrhea, and at times, dehydration, said Ms. Theresa Devasia, a third-year statistics major at UGA.

While infections tend to be most severe in the young and the old, it was not well known how the time between the infection and the onset of symptoms, as well as the duration of symptoms, might depend on age and other characteristics.

Working on this study, Ms. Devasia and Dr. Handel studied a large set of outbreaks of norovirus infections. They went through past research in order to collect their data, searching for norovirus outbreaks and obtaining details about the patients, the setting, means of transmission, and other relevant values.

“For instance, we looked at health care settings and food service settings to see if they might show differences,” Dr. Handel said.

They found that, on average, “if you get norovirus, 32 hours is on average how long it takes from being exposed to having symptoms and 44 hours is on average how long you have the symptoms-pretty much no matter what,” Dr Handel said.

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