234 OVINE CASEOUS LYMPH- ADENITIS 



or the leno^th of time that a contaminated pasture may be 

 dangerous. 



In the present state of knowledge the question of preven- 

 tion is an extremely difficult one in the case of farms on which 

 the disease has existed for a number of years. The isolation or 

 destruction of diseased and suspected animals should be prac- 

 ticed. If in stables the feces passed by diseased or suspected 

 animals ought to be burned. Cattle should be kept off from 

 pastures in which such animals have run. As the time during 

 which the bacteria remain alive outside of the body is not 

 known, it is impossible to indicate the period during which 

 infected pastures are dangerous to other cattle. 



REFERENCES. 



1. Bang. Chronische pseudotuberculose Darmentziindung beim 

 Rinde. Berliner Tierdrztliche IVochensc/irift, 1906, p. 759. 



2. BORGEAUD. Schweizer Archiv. f. Tierheilk., (1905), p. 221. 



3. JOHNE AND FroThingham. Kill eigenthiimlicher Fall von 

 Tuberkulose beim Rind. Zeitschrijt fitr Thiermedicin, Vol. XXI 

 (1894), p. 438. 



4. Lienaux and Eeckhoct. Contribution a 1' ^tude d'une 

 entente tuberculeuse speciale et de la diarrhee chronique du boeuf. 

 Annalca de Medccinc Vetcrinaire, Vol. LH' (1905). P- ^S- 



5. Markus. Zeitsch.f. Tiermediciri, Bd. VIII (1904), P- 68. 



6. M'Fadyean. Johne's disease ; a chronic bacterial enteritis of 

 cattle. Jour, of Conipar. Path, and T/iera., Vol. XX (1907), p. 48. 



OVINE CASEOUS IvYMPH-ADENITIS (PSEUDO-TUBERCULOSIS 



IN vSHEEP). 



Synonyms. Pseudo-tuberculosis ; caseous adenitis. 



§ 165. Characterization. Caseous lymph-adenitis is a 

 disease of adult sheep which until 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 mortality is very low, due 



