OVINE CASEOUS LYMPH-ADENITIS l6l 



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OVINE CASEOUS LYMPH-ADENITIS. (PSEUDO TUBER- 

 CULOSIS IN SHEEP.) 



§ iig. Characterization. Caseous lymph-adenitis is a 

 disease of aduh sheep which iiutil recently was designated as 

 pseudo-tuberculosis. It has been characterized by an enlarge- 

 ment of one or more lymphatic glands which contain foci 

 of a greenish-yellow, caseous or purulent substance. It is 

 rarely found in young animals. The mortalit}' is very low 

 due, perhaps, to the fact that the sheep are slaughtered before 

 the disease has time to develop. It does not occur in epizootic 

 form although it is more prevalent in certain localities than in 

 others. 



^ 120. History. The name "Ovine Caseous Lymph Aden- 

 itis'' was proposed by Norgaard and Mohler in 1899. These 

 writers found the lesions and the accompanying microorganism 

 to correspond with those described by Preisz and Guinard in 

 1 89 1 as pseudo-tuberculosis. The bacterium was fully described 

 by Preisz in 1894. The organism has been found and identified 

 from a lai-ge variety of lesions in a number of species of ani- 

 mals. It appears that at least many of the cases of lymphatic 

 gland enlargement heretofore called pseudo-tuberculosis in 

 sheep belong to this disease. Cherry and Bull describe it as 

 caseous lymphatic glands and Sivori as caseous broncho-pneu- 

 monia ; the bacterium of Preisz being found as the probable 

 cause in each case. 



