The CDC said 652 people have been infected with salmonella -- and there have been 129 hospitalizations. No deaths have been reported.
"Epidemiologic and traceback data show that one source of infections in this outbreak are whole red, white, and yellow onions imported from Chihuahua, Mexico, and distributed throughout the United States by ProSource Inc," the CDC said in a statement.
Multiple people who contracted salmonella ate onions at the same restaurant, according to epidemiological interviews conducted by the CDC.
The number of people sick with this salmonella outbreak is likely higher than reported, and it's possible the outbreak isn't limited to the reported states, the CDC said.