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infectious laryngotracheitis

n :  a severe highly contagious and often fatal disease of chickens and pheasants that affects chiefly adult birds, is caused by a herpesvirus, and is characterized by inflammation of the trachea and larynx often marked by local necrosis and hemorrhage and by the formation of purulent or cheesy exudate interfering with breathing .
 
 

 
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Blue Mountain Hospital (John Day, Oregon - Grant County)