 If you've recently bought El Sefa brand chicken products, check your freezers before eating them. The Ontario-based company is recalling 2,010 pounds of imported frozen ready-to-eat products since they may be contaminated with listeria. Consumption of contaminated food can cause a serious infection that primarily affects older adults, persons with weakened immune systems, and pregnant women and their newborn babies. According to Yavapai County Community Health Services officials, listeriosis can cause fever, muscle aches, headache,