A dairy has been ordered to stop production and anyone who has bought its milk or cream is asked to destroy it after contamination was found.
Public Health England and West Devon Borough Council are urging consumers who have milk or cream products from Dunn's Dairy at Beacon View Farm in Drewsteignton, Devon, to dispose of them.
The alert follows an inspection of the dairy premises where milk samples taken by environmental heath officers raised concerns that either the pasteurised milk had been contaminated or the pasteurisation process had not been effective.
As a precaution, the council's environmental health team has asked the dairy to stop supplying milk and cream products and recall any supplied.
The dairy, which supplies milk to doorsteps and businesses covering West Devon, Teignbridge, Exeter, Mid Devon and Torbay, has also been issued with a notice to stop production.
The dairy should not be confused with with Dunn's Dairy of Underdown Farm in Exbourne, Devon.
Dr Mark Kealy, consultant with the Devon, Cornwall and Somerset Public Health England centre, said: "Taking into account the findings from the environmental health officers who visited the dairy, we want to take a precautionary approach and ask anyone who has received milk and cream products from the dairy to dispose of it and not consume. We will continue to work with West Devon Borough Council who will be carrying out further investigations."
Peter Wearden, divisional environmental health officer at the council, said: "Environmental health officers visited the dairy and took milk samples, the results of which have raised concerns about the potential of either insufficient heat processing or cross-contamination of the milk at the plant.
"We have taken steps that require the dairy to stop processing milk and recall milk and cream products that might have been sold to the public. We must be satisfied that the products can be produced safely before we allow future sales and we are continuing our investigations. We have co-ordinated a county-wide investigation working with district council officers across Devon and we have also been in discussions with the Food Standards Agency."
The semi-skimmed and whole milk bottles have a label that has a pink background with a red cow logo and has a use-by date of June 19. The milk mark on the bottles is 'UK DE 008 EC'.