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  • New ‘Vomiting Virus’ Strain Behind Recent US Outbreaks
  • 11. November 2020
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  • Maria Bauer
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New ‘Vomiting Virus’ Strain Behind Recent US Outbreaks

A new strain of norovirus — a stomach bug that causes diarrhea and vomiting  —  was responsible for most outbreaks of the disease in the U.S. in recent months, the Centers for Disease Control and Prevention said today (Jan. 24).

Last fall, 53 percent of norovirus outbreaks (141 out of 226) were caused by the new strain, dubbed GII.4 Sydney. Between September and December, the proportion of norovirus outbreaks caused by the new strain increased from 19 percent to 58 percent, the CDC said.

Norovirus outbreaks are common this time of year, typically striking between November and April. The peak usually occurs in January, so it's too soon to tell whether or not the new strain will cause more outbreaks this season than during previous seasons, the CDC said.

New strains of norovirus typically emerge every two to three years. The current strain was first detected in Australia last March.

“New norovirus strains often lead to more outbreaks but not always,” said Dr. Jan Vinjé, director of CaliciNet, the CDC's surveillance system for norovirus.

Norovirus is very contagious. Each year, about 21 million people in the U.S. fall ill from the bug, and about 800 die. Young children and the elderly are at highest risk for severe illness, the CDC said.

Fifty-one percent of outbreaks caused by the new strain were spread person to person, 20 percent were due to foodborne illness, 1 percent due to waterborne illness, and 28 percent had an unknown mode of transmission, the CDC said.

Health care workers should be aware of the potential for an increased number of norovirus infections this season, the CDC said.

Continued surveillance of the new strain will allow researchers to better assess the public health implications of the strain.

The best ways to prevent norovirus infections are hand washing with soap and water; disinfecting surfaces; rinsing fruits and vegetables; cooking shellfish thoroughly; and not preparing food or caring for others while ill, the CDC said.

Although the U.S. is currently experiencing flu and whooping cough outbreaks as well, experts say the three outbreaks are not related.

A study on the activity of the new norovirus strain is published in the Jan. 25 issue of the CDC's Morbidity and Mortality Weekly Report.

Pass it on: Most outbreaks of norovirus last fall were caused by a new strain of the bug.

Follow Rachael Rettner on Twitter @RachaelRettner, or MyHealthNewsDaily @MyHealth_MHND. We're also on Facebook & Google+.

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Maria Bauer

Maria is our expert for medicine, fitness and general health. Her contributions are particularly convincing through completeness, accuracy and her own personal experience. Maria also writes for other health magazines, which has enabled her to build up her expert status.

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