Emerging Role of Haemophilus somnus in Previously Unreported Manifestations in Western Canada

Abstract

This discussion will encompass personal observations and impressions developed from involvement in academic research and involvement with the diagnostic laboratory system in Alberta. The title should be interpreted as a question rather than a statement of fact. I have endeavoured to answer it and in the attempt stressed the importance of cautious investigation into the resolution of questions of feedlot health (disease). I have deliberately minimized the inclusion of information and opinions available from various published sources. An effort has been made to examine the roles of the practitioner and the diagnostic laboratory when making conclusions on feedlot health patterns. The role of H. somnus in several feedlot disease syndromes has been examined with suggestions on possible pathogenic mechanisms.