Good Morning Britain was back on our screens on Friday with Sean Fletcher and Charlotte Hawkins on presenting duty. Dr Sarah Jarvis, who is currently filling in for ITV health expert Dr Hilary Jones, was on hand to offer her opinion on the latest coronavirus news.The GP addressed the news that almost 300 workers have tested positive for coronavirus following an outbreak at a factory in Northampton that makes M&S sandwiches.Greencore said some of its staff are self-isolating after a significant number tested positive for coronavirus.The company took the decision to proactively test workers as a result of a rise in cases in the town.GMB host Sean, 46, pointed out that it was a risk eating already cooked food like sandwiches, however Dr Sarah.