The increase in the number of cases in recent days comes ahead of a Government review of the county’s Tier 3 status.
Data from Public Health England, published by Northumberland County Council, reveals the county-wide infection rate was 168.6 per 100,000 on December 12.
This compares to 150.8 per 100,000 on December 7.
There were 540 confirmed positive cases in the seven days up to December 12.
This compares to 483 confirmed positive cases in the seven days up to December 7.
Here are the 20 wards in Northumberland with the highest number of recent cases...