(Portland, OR)  --  A recall is in effect for organic walnuts sold in Oregon that have been tied to an outbreak of E. coli cases.  The Centers for Disease Control and Prevention has issued a warning about Gibson Farms organic walnuts sold in bulk at co-ops and natural food stores in Oregon and 18 other states.  Over 12 people from Washington and California have been infected with E. coli after eating the nuts.  Seven of those people were hospitalized.