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The workers, who carry out picking and packing work, are being asked to remain on the farm during a period of isolation
Up to 200 workers have been told to self-isolate on the farm where they pick crops after 73 colleagues tested positive for Covid-19.
Vegetable producers A S Green and Co, in Herefordshire, has gone into lockdown after the positive tests.
Food and other essential supplies are being delivered to the farm, where the workers have been segregated into the mobile homes they live in.
The firm is also being supported by Public Health England (PHE).
Herefordshire Council, which has organised the supply of deliveries, believes the outbreak is "contained" on the farm.
Farm 'an extended bubble'
The workers carry out picking and packing work during the harvesting season on the farm, just west of Malvern, in Worcestershire.
The company said the welfare of its staff was its "priority" and further testing of management and visitors to the farm had so far produced negative test results.
As a precaution, the workers are being treated as "one extended bubble" and are staying within household groups, the council said.
In a statement on its website, A S Green and Co said: "Public Health England advises that it is very unlikely Covid-19 can be transmitted through food or food packaging, so shoppers can remain confident buying British fruit and veg."
The farm is currently closed to visitors.
From 29 June to 5 July, Herefordshire had an average rate of two new coronavirus cases per 100,000 people, figures from Public Health England show. This compares with Leicester, which had 116 cases per 100,000.
At the scene - Joan Cummins, BBC Midlands Today
A S Green is a vegetable producer nestling in sight of the Malvern Hills in Herefordshire.
The farm grows beans and broccoli and is a long established family run business in the area.
It employs about 200 seasonal pickers and packers from Eastern Europe to help with the crop.
A few workers could be seen in the distance wearing face coverings and walking to the entrance of the farm to collect shopping delivered by the local authority.
I understand although a few of the workers had symptoms, most were asymptomatic and the positive results of 73 people came as a surprise to them.
The Director of Public Health for Herefordshire said both the farm's owners and staff were co-operating with the health authorities.
Katie Spence, PHE Midlands health protection director, said a range of infection control measures had been introduced, including on-site testing, social distancing in communal areas and the indoor packaging area.
Workers are also being encouraged to wash their hands regularly and use face coverings in closed areas.
"Despite these measures, a small number of workers became symptomatic earlier this week and they and a few close contacts among the workforce were tested initially and found to be positive," she said.
PHE said it is still awaiting a few final results of tests on the workforce.
Image caption Hereford Council leader David Hitchiner said the virus is "contained" on the farmKaren Wright, director of public health for Herefordshire, said: "Prompt testing on the farm has allowed us to understand transmission and control the spread of infection.
"We continue to support the farm management, their workers, who form an important part of our local economy, and the local community through this challenging time."
The National Farmers' Union (NFU) said the industry takes this issue "incredibly seriously".
"Everything is being done to keep workers safe; their health and safety remains the priority," a spokesman said.
"Across the sector there have been significant investments this season; from the use of additional safety equipment and PPE, regularly testing temperatures, and following government guidance created specifically for seasonal workers."
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There has been a recent spike in cases at meat processing plants across the UK and Europe.
Lawrence Young, Professor of Molecular Oncology at the University of Warwick, said factories and, in particular, indoor areas which are cold and damp are "perfect environments for coronavirus to linger and spread".
The government has issued guidelines on working safely in food manufacturing.
Overall, the Herefordshire council area has recorded 749 cases during lockdown, as of 7 July.
Speaking to BBC Midlands Today, council leader David Hitchiner said: "I would say we've got it contained, these people are not people who travel around the community, they tend to stay where they are.
"I don't physically know the site but I would hope it is quite isolated and so it shouldn't spread out among the community.
"The owners are keeping the workers there on the site and doing their very best to make sure it can't spread any further off this farm."
He added that expected PHE are now trying to trace the original source of the outbreak.
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