What is 'winter vomiting bug'? Why a new variant is driving a US surge?

A potent new norovirus variant is fueling a nationwide surge, coinciding with rising cases of flu, whooping cough, measles, and COVID-19. This highly contagious "winter vomiting disease" is causing significant outbreaks, particularly in California, with health officials urging vigilance and strict hygiene practices to curb its spread. While symptoms are usually short-lived, vulnerable groups may require medical attention.

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