The number of coronavirus clusters in Cornwall has doubled in three days and the seven-day total has more than 100 extra cases recorded.

On Wednesday's updated government map there were 20 cluster areas, but as of 4pm last night (Saturday, December 19) that number had risen to 40 clusters.

It also marks a stark reversal from a week ago, when both cases and clusters were on decline, with just 14 areas reporting cases on the government map last Saturday, December 12.

At the same time, the number of weekly cases has risen to 251 cases, from 148 on Wednesday and only 109 on December 12 - an extra 142 cases week-on-week.

The current figures relate to cases recorded in the seven days leading up to Monday this week, December 14, with the most recent five days left off due to incomplete data not reflecting the true number of cases.

It means the seven-day rolling rate has now risen to 43.9 cases per 100,000 people, from a rate of 19.1 cases a week ago.

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And while there were no coronavirus cases showing south of Carnon Downs last Saturday, there are now 18 clusters spanning this part of Cornwall alone, reporting anywhere between three cases and eight cases.

Clusters are only shown when there are at least three confirmed results, with anywhere having between zero and two cases showing white in order to "protect the privacy of individuals and prevent disclosure."

However, the two areas of Cornwall the biggest spikes are in the east, with Callington & Pensilva recording 26 cases and an individual rolling rate of 311.5 cases per 100,000, while Gunnislake & Calstock have 19 cases and a rolling rate of 294.3 cases per 100,000.

Both these rates are well above the average England case rate.

The map shows positive cases by 'Middle Super Output Area' - the name the government gives to the break-up of larger towns and groups of neighbouring towns and villages, with groupings covering a greater area than others.

The minimum population in each area is 5,000 and the average is 7,200.

 Some of the new Covid clusters in Cornwall since WednesdaySome of the new Covid clusters in Cornwall since Wednesday

Case clusters now showing on the map are:

St Just & Land's End

Total cases: 4

West Penwith & St Buryan

Total cases: 3

Penzance South & Newlyn

Total cases: 5

Penzance North

Total cases: 6

Penzance Quay

Total cases: 3

St Ives & Halsetown

Total cases: 5

Hayle

Total cases: 6

Marazion, St Erth & Gwinear Gwithian

Total cases: 5

The Lizard

Total cases: 4

Helston

Total cases: 3

Crowan, Wendron & Stithians

Total cases: 3

Ponsanooth, Mabe Burnthouse & Constantine

Total cases: 8

Penryn

Total cases: 4

Mylor Bridge & Frogpool

Total cases: 7

Pool & Illogan Highway

Total cases: 3

Camborne East

Total cases: 3

Illogan & Portreath

Total cases: 5

Truro West

Total cases: 4

Truro South & Central

Total cases: 5

Newquay West

Total cases: 3

Newquay East

Total cases: 6

St Columb Minor & Porth

Total cases: 4

Mevagissey & Polgooth

Total cases: 4

St Austell Central

Total cases: 6

St Austell East & Carlyon Bay

Total cases: 9

St Austell North & Carclaze

Total cases: 4

Par

Total cases: 3

Tywardreath & Fowey

Total cases: 6

Lostwithiel & Penwithick

Total cases: 6

Roche & Goss Moor

Total cases: 3

Trebetherick & Whitecross

Total cases: 3

Bodmin East

Total cases: 3

Dobwalls, Addington & Menheniot

Total cases: 4

Liskeard

Total cases: 3

Mid Saltash

Total cases: 7

Callington & Pensilva

Total cases: 26

Gunnislake & Calstock

Total cases: 19

Altarnun & Stoke Climsland

Total cases: 3

Launceston

Total cases: 3

Bude & Stratton

Total cases: 5