The Georgia-based company Alma Pak International LLC is voluntarily recalling 400 30-pound boxes of organic blueberries due to a high risk of listeria contamination, according to the U.S. Food and Drug Administration. The recall was initiated on June 9 and categorized as a Class I recall by the FDA on July 1.

The FDA elevated the recall on Tuesday, July 1, to a Class I recall — the highest, most serious recall classification. This classification is defined as a situation where there's a “reasonable probability” that consuming the contaminated product could lead to serious health issues, including death.