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Eighteen at a Bernard Matthews turkey plant tested positive for coronavirus and self-insulated.
Food production at Holton processing plant near Halesworth, Suffolk, was not affected by the outbreak.
Close to a hundred workers have been tested for Covid-19 with maximum negative effects and further testing is underway this week.
The site has been implementing controls since March to decrease coronavirus infections, adding normal temperature controls, bubble staff, Covid marshals, masks and visors, and social distance from the site.
It is believed that most of the 18 employees who tested positive in the spaces and instances of Great Yarmouth and Lowestoft started in the community, the company said.
Officials, adding the Suffolk County Council, Public Health England and Bernard Matthews, are running in combination to handle the situation.
Stuart Keeble, Director of Public Health at Suffolk, said, ‘I need to assure other people that this is a small number of cases right now and that the scenario is being treated very thoroughly across all partners who run together greatly. “
A spokesman for Bernard Matthews said: “We are grateful for the help of all local agencies and their entire goals of protecting the local community.
“We believe that this small number of instances have been initiated in the community, however, we will continue to implement our strong Covid measures as we enter our most active time of year. “