Salmonella Cases Linked to Onions Increase to Nearly 900

He recommended not to consume the onions, even if they have been cooked, because cross contamination with utensils may have occurred.

“It’s better to be safe than sorry,” he said. “Just don’t use them.”

Thomson’s onions were distributed in mesh sacks and cartons under the names TII Premium, El Competitor, Hartley, Onions 52, Imperial Fresh, Utah Onions and Food Lion, the producer said. The F.D.A. said the onions were also distributed under the names Thomson Premium, TLC Thomson International, Tender Loving Care, Majestic and Kroger.

Grocery chains and producers have joined Thomson in recalling the onions, including Publix and Giant Eagle. Taylor Farms Texas, a company that makes prepared foods, has also voluntarily recalled its products with onions in Kroger and Walmart stores.

Taylor Farms said Kroger shoppers in Louisiana and Texas should immediately dispose of Taylor Farms’s macaroni salad, rotini pasta salad and chicken salad croissant sandwiches.

Walmart shoppers in Texas should also dispose of chicken salad sandwiches. Walmart shoppers in Colorado, Iowa, Illinois, Kansas, Missouri, North Dakota, Nebraska, Oklahoma and South Dakota should discard Marketside branded diced yellow onion, mirepoix and fajita stir fry.

“As soon as we were notified by Taylor Farms of the recall,” Walmart said in a statement on Sunday, “we immediately alerted our stores and distribution centers to remove the affected products from store shelves and inventory, and we placed a sales restriction on them.”

Walmart and Kroger have also been instructed to remove and dispose of any remaining products tied to the onions in their stores, Taylor Farms said.