Data from Public Health England, published by Northumberland County Council, reveals the county-wide infection rate was 173.3 on December 20.
This compares to 156.4 on December 16.
By comparison, the England-wide rate stands at 284.2.
Northumberland is currently in Tier 3 restrictions but there are 18 wards with rates below those of Tier 1 Herefordshire (78.3).
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