If you recently purchased packaged salad mixes and vegetables, it's important to check the list of recalled, pre-packaged vegetables below. According to the FDA, at least 20 different products sold at retail stores across the United States have been recalled due to possible Listeria contamination. The tainted vegetables were sold at Walmart, Safeway, Albertsons, H-E-B, and Aldi stores across the United States and in Canada.

Which products have been recalled?

According to the Miami Herald, the recall includes a variety of products distributed by Mann Packaging. Of course, that won't mean anything to consumers because it's the brand name, not the distributor's name, that shows on the package.

If you find that you have purchased one of the recalled products below, it's important to check the Best By date. The FDA reports that the pre-packaged vegetables that have been recalled all have "Best By" dates that range from October 11-20, 2017. The date normally appears on the front of the package.

There is only one Trader Joe’s store brand product on the recall list — Kohlrabi Salad Blend. If you shop at Aldi, the recalled products include two products sold under the Little Salad Bar brand — broccoli slaw and florets.

There are several Walmart brand vegetables that have been recalled including three types of broccoli (florets, slaw, and broccoli/cauliflower blend), a vegetable and stir-fry medley, and pre-packaged cauliflower.

Check your refrigerator for vegetables packaged under Safeway and Albertson's brand name, Signature Farms.

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Various types of pre-packaged broccoli are part of the Listeria recall. Also included are Signature Farms meat and cheese trays, hummus, and a veggie tray with ranch dip.

H-E-B stores also have a long list of vegetables and packaged salads on the recall list, all under their own store brand. Archer Farms, typically sold at Target, has also recalled various packages of broccoli, cauliflower, and Brussels sprouts with the "Best By" date listed above.

What are the symptoms of Listeria?

According to the Center for Disease Control (CDC), if you eat food that is contaminated with Listeria, symptoms can take one to four weeks to appear, sometimes even longer. Typical symptoms include fever, muscle pain, a headache, and a stiff neck.

Some people experience a loss of balance and confusion. The CDC states that pregnant women should seek medical advice immediately if they have any of these symptoms as Listeria infections during pregnancy can lead to miscarriage, premature delivery, or other complications.