The Food and Drug Administration announced Thursday that Quaker Oats is expanding its recall on Quinoa Granola Bars, as as a result of further sunflower kernel contamination found by ingredient supplier SunOpta, the FDA said.

Here are the effected products:

• 6.1 ounce boxes of Quaker Quinoa Granola Bars Chocolate Nut Medley with UPC code 30000 32241 and Best Before Dates before 11/15/16.
• 6.1 ounce boxes of Quaker Quinoa Granola Bars Yogurt, Fruit & Nut with UPC 30000 32243 and Best Before Dates before 11/15/16.

The granola bars may contain Listeria monocytogenes (L.mono), an organism, which can cause serious and sometimes fatal infections in young children, frail or elderly people, and others with weakened immune systems, the FDA says. 

Quaker and SunOpta are continuing to investigate the cause of the infected sunflower kernels. 

Those who have purchased the products are encouraged to either dispose or return them.