The Food and Drug Administration (FDA) upgraded a blueberry recall this week to the highest risk level amid concerns of contamination.

The FDA raised the recall of 400 boxes that weigh 30 pounds to Class I.

The blueberry recall, which took place June 9, was initiated after Alma Pak International LLC of Alma, Ga. received a positive result of listeria monocytogenes during routine testing, according to the........

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