An estimated 650,000 bags of potato chips are affected as US agency upgraded recall of several popular brands

The US Food and Drug Administration (FDA) has upgraded a recall of several popular brands of potato chips to its most serious level because of the risk of salmonella contamination.

Manufacturer Utz issued a voluntary recall in May for varieties of its Zapp’s and Dirty potato chips products, citing the possible presence of salmonella in dry milk powder sourced from a third party used to make a seasoning ingredient.

An estimated 650,000 bags of chips with best by dates ranging from 27 July to 31 August were believed to be affected. In its most recent weekly enforcement report, published Friday, the FDA gave the recall a Class 1 designation, its highest level.

The affected products are: Zapp’s Brand Bayou Blackened Ranch Potato Chips (1.5oz), Zapp’s Brand Bayou Blackened Ranch Potato Chips (2.5oz), Zapp’s Brand Bayou Blackened Ranch Potato Chips (8oz), Dirty Brand Salt and Vinegar Potato Chips (2oz), Zapp’s Brand Salt and Vinegar Potato Chips (1.5oz), Dirty Brand Maui Onion Potato Chip (2oz), Zapp’s Brand Big Cheezy Potato Chip (2.5oz), Zapp’s Brand Big Cheezy Potato Chip (8oz), and Dirty Brand Sour Cream and Onion Potato Chips (2oz).