By Gareth Lightfoot & Jake Loader A hospital has been forced to close three wards as a winter vomiting bug sweeps through patients. James Cook University Hospital in Middlesbrough is experiencing its “worst norovirus outbreak for four to five years” with nurses urging people with symptoms such as vomiting or diarrhoea to stay at home so it doesn’t spread further. Dr Mike Stewart, chief medical officer for the South Tees Hospitals NHS Foundation Trust, said: “We’ve spent the last few days managing the first norovirus, or winter vomiting virus, outbreak in the organisation. And it’s the biggest …