CDC sends help as more WA egg farm workers test positive for bird flu The Seattle TimesBird flu cases rise to 31 in US, still no evidence of person-to-person spread: CDC ABC NewsAvian influenza case confirmed in Clackamas County egg farm Oregon Public BroadcastingUS confirms two human bird flu cases in Washington state ReutersHighly Pathogenic Avian Influenza confirmed in Crook County farm's backyard flock of 70 birds, humanely euthanized KTVZ