A total of 6.02 per cent of people in the county tested positive in the week up to January 6 – with modelling suggesting this meant one-in-15 had the virus.
During the previous week, up to December 31, the figure was 5.86 per cent.
The infection rate in Derby city is higher – rising from 6.24 per cent to 7.66 per cent over the same time period.
Other parts of England have seen infection rates reach one in 10, such as Liverpool, Wigan, Manchester, Kirklees, Sheffield, Lincolnshire, Birmingham and many London boroughs.
The overall figure across England is one-in-15, with Scotland, Wales and Northern Ireland at one-in-20.