There are more than 1,000 people working at the site, according to North Wales Live.
They need to find around 300 people who work at Rowan Foods in Wrexham, where 166 cases of coronavirus have been confirmed so far.
Tracers need to find 300 people who work at Rowan Foods in Wrexham – which supplies major supermarkets including Tesco, Sainsbury’s and Asda
“As we would expect with any focused track and trace process, we will identify additional asymptomatic cases. Finding these cases does not mean that the rate of infection in the Wrexham area is increasing as a whole.
Public health bosses have launched an urgent search for hundreds of workers after a coronavirus outbreak at a food processing site.
In a statement today, Public Health Wales said: “We are working with Betsi Cadwaladr University Health Board to urgently contact just over 300 workers that have not yet presented for testing.
The firm supplies major supermarkets including Tesco, Sainsbury’s and Asda.
The Wrexham site first hit the headlines in relation to coronavirus earlier this year, when workers walked out in April in an apparent protest over what they felt was a lack of protection from the virus.
“There is no evidence that Rowan Foods is the source of the outbreak. The multi-agency team managing the outbreak with Public Health Wales will continue to review the situation and work with the employer, their workforce and wider community to bring this outbreak to a swift conclusion.”
It comes amid warnings that the UK will be hit by a second coronavirus wave within the next three months.
The Rowan Foods outbreak and the cluster of cases around the Anglesey 2 Sisters abattoir have so far accounted for more than 300 infections.
“The next three months are absolutely critical. We’re on a knife edge.
Speaking to the BBC’s Andrew Marr Show, Mr Farrar said: “We can prevent the national catastrophe that happened in March and April.
Sir Jeremy Farrar, Director of the Wellcome Trust, said it is important for Brits to be prepared for the next spike in coronavirus infections – and shared worries about pubs and restaurants opening up on July 4th.
“But if we don’t have those core infrastructures in place, we will see a very nasty rebound in the winter.”