81 View comments There is a huge number of cases of norovirus, or winter vomiting bug, this year. More than 800,000 cases have been confirmed since the summer, an 83 per cent increase on the same period last year. The real figure is likely to be much higher given that many cases are not reported. Preventative measures: The norovirus is easily spread through contaminated hands and surfaces so hygiene is key How can the spread of the infection be contained? The infection spreads easily from person to person through contaminated hands and surfaces, so hygiene is critical. It is particularly crucial for children and those handling food. Those who have had the infection must remain isolated for 48 hours after recovery to prevent others being infected. We have already seen hospital wards and schools closed after outbreaks. This is an effort to contain the virus and curb a potentially larger epidemic. Why does it happen every year? Norovirus is no different from other viruse