Fresh fruit and flower suppliers to major supermarkets have had an outbreak of Covid-19, public health officials have confirmed.
MM Flowers and AM Fresh UK, based on one site in Alconbury, Cambridgeshire, have seen 26 employees test positive.
The firms, which employ 550 full-time staff and 300 agency workers, said they were working with Public Health England to trace the source of the outbreak.
Public Health England said it would issue a statement later.
A spokeswoman for the flower company said: "Like many organisations, AM Fresh UK and MM Flowers have taken extensive steps to ensure the safety of their people and their continued operation providing fresh produce and cut flowers.