The town’s infection rate jumped to 391 per 100,000 people in the week ending 31 December from 253 in the previous seven days. During this time, 427 people in Mansfield tested positive for the illness, up from 277 the week before. Still, the infection rate was smaller than the national average for this period of 453. Doncaster Sheffield Airport passengers urged to check flights as new lockdown halts travel Studies show the majority of people develop coronavirus symptoms five days after exposure. The latest data shows coronavirus cases have risen in 93 per cent of England's 315 local authority areas. Barking & Dagenham in London continues to have the highest rate in England, with 3,143 new cases recorded in the seven days to December 31. A third national lockdown has begun in England as of today (Tuesday, 5 January) and is expected to last until at least mid-February.