All previous waves of norovirus in the U.S. since 2012 have been dominated by a different strain that scientists call GII.4, said Vinjé. This season, only around 7% of norovirus outbreaks have ...

However, the strain only rose to dominance in norovirus outbreaks over a year ago; between Sept. 1, 2023 through Aug. 31, 2024, GII.17 accounted for 109 norovirus outbreaks.

Since the strain called "GII.4 Sydney" was identified in Australia last March, it's been getting around. The U.K. has had a bang-up norovirus season with more than a million people sickened.

That marked the start of the season for the virus. But last year's season started in October, as a new norovirus strain called GII.17 drove a record wave of outbreaks.

A new strain of norovirus may be circulating, potentially leaving fewer people with immunity, according to Lynn Roberts, an epidemiologist with the Wisconsin Department of Health Services.

Norovirus strains vary in size and the arrangement of their protein shells. For instance, the GII.2 Snow Mountain strain (C) is similar in size to the GI.1 Norwalk strain (A) ...

A surge in norovirus cases might be explained by a new strain of the virus, which now reportedly makes up a majority of outbreaks across the U.S.. This winter’s dominant norovirus strain is a ...

How you can catch norovirus twice. From September 1, 2024 through the end of December, health officials reported 56 norovirus outbreaks across the country, spanning 10 different genotypes, or strains.

A new strain of the winter vomiting disease norovirus has spread to France, New Zealand and Japan from Australia and is overtaking all others to become the dominant strain in Britain, health ...

NEW YORK — A new strain of norovirus now makes up a majority of outbreaks nationwide, according to data from the Centers for Disease Control and Prevention. The new strain's emergence, found ...

A new norovirus strain reported in Alabama and Tennessee will likely come to Columbus, and residents have less immunity to it. Photo by Pixabay The highly contagious norovirus has been rapidly ...