Detection of Yersinia ruckeri in Pacific Lamprey on the Olympic Peninsula in Washington, USA.

Pacific lamprey (Entosphenus tridentatus) are important anadromous fish throughout their range in western North America. As conservation programs for lamprey expand, disease surveillance is becoming more prevalent. During routine surveillance, Yersinia ruckeri biotype II was isolated from Pacific lamprey. This is the first documented Y. ruckeri detection in Pacific lamprey.