Histophilus Somni

THE ROLE OF Histophilus somni IN BOVINE RESPIRATORY DISEASE

Summary:

Histophilus somni is described as an ethiological agent of a variety of diseases in cattle that include respiratory, nervous, septicemic, myocardial and polyarthritis presentations. The bacteria can be isolated from the nasal mucosa of apparently healthy cattle, but in situations of immunesupression it takes a role as ethiologic agent of acute fibrinous or fibrin-hemorrhagic bronchopneumonia in calves. Some case control studies have found incidences of H. somni of 28 to 43% in pneumonic lungs. Different well known factors make of H.

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