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The CDC advises discarding onions if you don’t know where they’re from.

A minor outbreak of salmonella has sickened at least 650 people across 37 of the United States. Approximately 130 of the people who were sickened have also been hospitalized, though no deaths have been reported. According to a report from the US Centers for Disease Control and Prevention, the culprit behind this salmonella outbreak is onions, specifically those imported from Chihuahua, Mexico and distributed by ProSource Inc.

The CDC has been aware of this outbreak for about a month now, but only just recently discovered the cause lay in red, white, and yellow onions from Chihuahua. The onions were imported at the end of August and sold to various restaurants and grocery stores around the country. In an effort to slow the outbreak, the CDC has issued a food warning advising all US citizens to discard any onions with packaging indicating they were distributed by ProSource or came from Mexico. In the event you aren’t sure where the onions came from due to a lack of packaging or stickers, the CDC advising discarding them anyway. Businesses are also being advised to discard any onions with similar classifications.

Symptoms of salmonella include diarrhea, vomiting, stomach cramps, and a fever of over 102 degrees Fahrenheit. Symptoms can manifest anywhere between six hours and six days after exposure, after which they will typically subside within four days to a week. Infants, the elderly, and the immunocompromised may become severely ill and require hospitalization.