State and federal health officials are investigating an outbreak of hepatitis A in Arizona, California, Colorado, New Mexico and Nevada.
The federal Centers for Disease Control and Prevention said Friday approximately 30 cases have been reported.
CDC says the cases are "potentially associated" with Townsend Farms Organic Antioxidant Blend frozen berries purchased from Costco.
Attorney Bill Gaar, representing Townsend Farms of Fairview, Ore., says investigators appear to be focusing on imported pomegranate seed that's in the product.
A Costco spokesman says the company has removed the product from stores and is contacting its members.
CDC, the federal Food and Drug Administration and state health departments are investigating.
Hepatitis A is a liver disease ranging from a mild illness lasting a few weeks to a severe one lasting several months.