Latest data from Public Health England, published by Northumberland County Council, reveals there were 1,533 positive cases in the week to December 15.
Nearly 800 of those were in the last three days.
The infection rate is 473.4 positive cases per 100,000 population.
Here are the 15 areas of Northumberland with the highest rates.
The infection rate is 473.4 positive cases per 100,000 population.
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