Before you go, we thought you'd like these...  General Mills has announced a national recall of four flavors of Nature Valley granola bars.  They contain sunflower seeds that are potentially contaminated with listeria, according to a press release.  No illnesses have been reported, but General Mills has asked consumers to throw away the affected products.  The following variations of granola bars are included in the recall:  If you purchased any of these products, you may call General Mills Consumer Relations at 1-866-896-4365 for replacements.  Out of the nearly 40 products Nature Valley offers, only these four are affected.  This isn't the first case of potentially contaminated sunflower seeds in the past few months -- Planters, Sunrich Naturals, Papa John's Salads and Produce and Quaker Oats also recalled products tied to the now-recalled seeds.  Recent Product Recalls March/April 2016  Trader Joe's Chocolate Sticks, Milk ingredients not listed  DiGiorno Pizza, contaminated with glass particles  DiGiorno Thin & Crispy Spinach and Garlic Pizza DiGiorno Rising Crust Spinach and Mushroom Pizza DiGiorno pizzeria Thin Crust Spinach and Mushroom Pizza DiGiorno pizzeria Tuscan-style Chicken Pizza  (Photo by Jb Reed/Bloomberg via Getty Images)  Lean Cuisine, contaminated with glass particles  Lean Cuisine Spinach and Mushroom Pizza Lean Cuisine Spinach Artichoke Ravioli Lean Cuisine Ricotta and Spinach Ravioli Lean Cuisine Spinach, Artichoke & Chicken Panini Lean Cuisine Mushroom Mezzaluna Ravioli  Stouffer's, contaminated with glass particles  Stouffer’s Vegetable Lasagna (10 oz., 37 oz. and 96 oz. sizes) Stouffer’s Spinach Soufflé Stouffer’s Chicken Lasagna  (Bill Hogan/Chicago Tribune/MCT via Getty Images)  Sausage, egg and cheddar cheese sandwiches labeled best before Aug. 7 2016  Pistachios labeled Wonderful, Paramount Farms and Trader Joe's. You can identify recalled products by lot number on back of bag.  Corona Extra Beer, contaminated with glass particles  Identify recalled product by codes.  More from AOL.com: Charlie Sheen admits two partners were unaware of his HIV status but says 'protection was always in place' Poofy cotton ball dog will put a smile on your face Mark Cuban: Trump 'doesn't have the cash to fund his campaign'
Four types of Nature Valley granola bars have been recalled because they might have come in contact with listeria.