Norovirus cases surge in US: What you need to know about this stomach bug

Norovirus outbreaks are rising sharply across the United States this winter, with 91 outbreaks reported in early December, compared to 69 in late November. Known for causing sudden vomiting and diarrhoea, norovirus spreads easily, especially in crowded settings. With no specific treatment, prevention through hygiene remains the best defence. Here’s what you need to know.