(NBC NEWS) Two of the top-selling brands of jerky treats for pets will soon return to U.S. store shelves, a year after a nationwide recall and with government experts no closer to solving the mystery that has linked the products to hundreds of animal deaths and thousands of illnesses.

Nestle Purina Pet Care officials say they’ll reintroduce a line of Waggin’ Train treats for dogs starting next month, including products made from a single supplier in China and new products sourced entirely in the United States.

“We’ve worked hard to put in place the highest quality controls in the dog treat industry,” Waggin’ Train President Nina Leigh says in a promotional video.

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