(Tacoma, WA)  --  Health officials say Washington's 12th known case of the Zika virus has been confirmed in Pierce County.  The patient is reported to be in his 20s and recently returned from a trip to Puerto Rico.  The Tacoma-Pierce County Health Department says the man hasn't been hospitalized and is recovering from his symptoms.  Officials say all cases of Zika in Washington are associated with travel to regions where the virus is spreading.