Taylor Farms Began Calling Customers Including Yum Brands, Sysco Yesterday To Pull Their Shredded Lettuce Out Of Distribution; Industry Source Said "I Think We Will Ultimately Find More Products, More Illnesses That Tie Back To Taylor Farms"; Lettuce That FDA Said In Advisory Late Thursday Came From 5-lb. Bags Produced At Taylor Farms' Facility In Guanajuato, Mexico