It's an incredibly unpleasant bug which can make you ill for days. Norovirus, which is often referred to as the winter vomiting bug, causes severe sickness and diarrhoea. And once you've got it, there's not a lot you can do. Now, Public Health England has issued new advice on how to avoid contracting the infection, Mirror Online reports. Nick Phin, national infection service deputy director for Public Health England, said: “Norovirus can be unpleasant and is easily passed on to those around you.