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Testing has uncovered 170 cases of Covid-19 among workers at a pork meat processing plant in Cornwall.
Five hundred staff at Pilgrim’s Pride in Pool, near Camborne, were tested in a contact tracing exercise by the NHS.
Most of those who tested positive were unaware they had Covid-19 and were not displaying symptoms.
They and those they have been in close contact with are isolating in line with government guidelines, said Cornwall Council.
Cases of Covid-19 in the South West are still below the national average, latest figures show.
Cornwall remains the area in the region with the highest number of cases.
In the week to Sunday, numbers rose from 115 to 180. The infection rate is 31.5 per 100,000.
“In total, almost 500 employees at the factory have been tested and the vast majority of the cases who tested positive were not displaying symptoms,” said Cornwall Council.
Rachel Wigglesworth, interim director for Public Health for Cornwall Council, said: “In finding people who weren’t displaying symptoms we have potentially stopped much wider spread in our communities”.