Procter & Gamble Co. issued a recall of its Iams brand prescription cat food due to possible Salmonella contamination.

The affected product is Iams Veterinary Formula Feline Renal, packaged in 5.5-pound bags. The company did not know exactly how many bags were involved in the recall but said that the product was distributed to veterinary offices throughout the US, according to Jason Taylor, a company spokesman. No illnesses have been reported, the company said in a statement.