The rate of increase is particularly marked in north-east Lincolnshire, with positive tests increasing rapidly since early October.
From early September, when cases were very low, the Grimsby area remains in the bottom two of the six boroughs until September 21, when the rate drops from 3 to 12 from previous days to reach the high teens.
From there, it steadily rises to 47 cases per 100,000 by the end of the month, which is still significantly lower than other parts of the region except East Lindsey.
However, the rate begins to rise rapidly in the first week of October, from 60 on the first day of the month to 139 on October 8.
Meanwhile, the borough is climbing to become the second worst hit in the region, behind North Lincolnshire.
On October 10, northeast Lincolnshire has the highest Covid-19 rate of the six regions it has remained since, accelerating rapidly over the following days.
In the meantime, North Lincolnshire’s case rate declined briefly before rebounding, although much more gradually than in the Grimsby area, where the latest available data shows it is far ahead of neighbors East Riding and Hull.
The figures are based on the number of people with at least one laboratory-confirmed positive Covid-19 test result during the continuous seven-day period ending on the dates shown.
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The government says the case rate per 100,000 population allows for a fairer comparison of the number of cases in each area, but does not take into account different screening rates or differences in age and sex of local populations.
It comes as the entire Humber region is under Level 2 restrictions starting this weekend. North East Lincolnshire, North Lincolnshire, Kingston-upon-Hull and the East Riding of Yorkshire will be classified in the “High” category on Saturday from 12:01 pm.
This will limit social contact to one household or support the bubble in indoor environments including homes, pubs, bars and restaurants, with the rule of six still applying outdoors.