LYNNWOOD, Wash. -- The USDA's Food Safety and Inspection Service has issued a public health alert after four illnesses were reported in western Washington. Officials say the illnesses, possibly caused by salmonella, may be linked to a chicken salad product sold at Costco Wholesale in Lynnwood. The Costco Rotisserie Chicken Salad affected was produced Aug. 26 through Sept. 2. Officials are concerned that consumers may have some of the chicken salad in their freezer. Inspectors say the product has not tested positive for salmonella, but three out of the four patients all consumed the chicken salad from this Costco location. Anyone who purchased this product on August 26, August 31 and September 2, 2016 are urged not to consume it. It should be thrown away or returned to the place of purchase. Here is more information about foodborne illness from FSIS: