Zapp's and Dirty brand potato chips have been recalled and are listed by the FDA as the highest risk category for salmonella. Photo courtesy of the U.S. Food and Drug Administration

July 2 (UPI) -- After a voluntary recall of some Zapp's and Dirty potato chips, the recall is now listed as the Food and Drug Administration's highest risk category for salmonella poisoning.

The chips are made by Utz Quality Foods, which recalled the chips in May. The FDA has since classified the recall as a Class I recall.

A Class I recall is "a situation in which there is a reasonable probability that the use of or exposure to a violative product will cause serious adverse health consequences or death, the FDA's website says.

The recalled products include: