52 HOG CHOLEBA 



renal pelvis. They are du-9 to the filterable 

 virus. 



Engorged with blood. Capsule peels easily. 

 Petechiae distributed as already described. Tend- 

 ency toward more and larger hemorrhages. 

 Changes usually due to filterable virus. Bact. 

 suisepticum or B. cholera suis may be secondary 

 invaders. 



Very light in color, " cooked kidney. " Capsule 

 peels easily. Marked evidences of degeneration. 

 (Cloudy swelling and granular degeneration.) 

 Petechiae distributed as already described. All 

 changes probably due to filterable virus. 



Very light in color. Capsule peels easily. No 

 petechiae. Seen most frequently in chronic hog 

 cholera. Changes often due to filterable virus, 

 but not characteristic of it. 



Very light in color. Capsule peels with diffi- 

 culty, may be thickened. Evidences of degenera- 

 tion followed by increase in interstitial tissue, and 

 chronic nephritis. Primary degeneration prob- 

 ably due to filterable virus. Nephritis due to sec- 

 ondary causes. All of these changes of little 

 diagnostic significance. 



Considered in general, these petechial hemor- 

 rhages, in the kidney are rarely due to influences 

 other than hog cholera virus. Exceptionally they 

 may be due to Bact. suisepticum, acting either as 



