Health officials are trying to locate more than 300 workers in a food factory after 166 staff members tested positive for coronavirus.
The epidemic occurred at Rowan Foods in Wrexham, which supplies the large supermarkets Asda and Sainsbury’s.
The food processing site, which employs more than 1,000 people, experienced an epidemic weeks after staff moved away from concerns about the working conditions of coronaviruses.
Wales Public Health said it is making efforts to contact around 300 workers who have not been tested for Covid-19.
In a statement, PHW said, “We are working with the Betsi Cadwaladr University Health Council to urgently contact just over 300 workers who have yet to show up for the test.
“As we would expect with any targeted tracking and tracing process, we will identify other asymptomatic cases. Finding these cases does not mean that the infection rate in the Wrexham region as a whole is increasing.
“There is no evidence that Rowan Foods is behind the epidemic.
“The multi-agency team managing the outbreak with Public Health Wales will continue to review the situation and work with the employer, their staff and the community at large to end the outbreak.”
Rowan Foods has been contacted for comments.
There have also been 210 confirmed cases at the 2 Sisters factory in Llangefni – which is closed – after more than 500 people have been tested.
Speaking about this epidemic, Public Health Wales said: “Following the meeting of the multi-agency epidemic control team held on Friday 26 June, a total of 210 cases of new coronavirus were identified among the staff associated with the 2 Sisters factory in Llangefni., Anglesey.
“This represents a small increase from six positive cases reported in the past 24 hours.
“The increase in reported cases is small, which is reassuring and proves that the controls put in place combined with the rapid testing process have worked.
“There is no evidence to suggest that the epidemic in the workforce at the 2 Sisters factory has resulted in significant community transmission.”
There has also been an outbreak of coronavirus at the Kepak Merthyr meat processing facility.
The Welsh government added: “A total of 29 verified positive cases have been registered by workers since the start of the coronavirus pandemic, nine of which since June 1, 2020, when Wales entered the recovery phase of Covid-19 response. “
On Sunday, 1,504 people died of a coronavirus in Wales.