(Olympia, WA)  --  Shellfish harvested over a period of about three weeks from a portion of Hammersley Inlet in Mason County, Washington are being recalled.  The Washington State Department of Health closed shellfish harvesting in the area after at least a dozen people who ate raw oysters last month had symptoms often linked to norovirus.  The recall covers all shellfish harvested in the affected area from November 10th to December 5th and sent to Oregon, California, and ten other states.  Officials say a leaking septic system is believed to have been the source of the contamination.