An area of Dorchester has reported the most cases in Dorset according to latest figures by Public Health England. AN OUTBREAK of coronavirus has occurred in an area of Dorset – as cases surge by 232 per cent in the area. An interactive map, which uses Public Health England data, shows how many people have tested positive for the virus in each area of the county over the seven-day period up to Friday, January 8. Public Health England breaks down the numbers of coronavirus cases into neighbourhoods called Middle Super Output Areas (MSOAs), which are smaller than council wards and based on population rather than geographical area.