Pneumo-enteritis in Sheep, etc. 93 



of the arms and thighs, on the under surface of the tail, on the 

 perineum and under the belly. Abortion is a common result the 

 lambs coming dead. 



Death may occur in six hours, more commonly in two or three 

 days, or even later, the temperature going down to below nor- 

 mal in the last stages. In case of recovery, convalescence is slow, 

 the animal remaining emaciated and weak, with lung lesions and 

 persistent cough for a length of time. These poor imperfectly 

 recovered animals continue to harbor the microbe and transmit it. 

 I^esions of the liver and other organs, the result of this disease, 

 are found in sheep that have survived the affection and are after- 

 ward killed for mutton. 



Symptotns : 2. Subacute and Chronic Form. This is seen in 

 mature sheep of two or three years, that have been infected when 

 in the full vigor of life and health, during an open air life and by 

 a limited dose of the virus. The temperature is less elevated, the 

 circulatory and respiratory functions less disturbed, the dulness 

 and prostration only moderate, the interruption of feeding and 

 rumination transient and tympany slight. Cough and nasal dis- 

 charge are however present and rather persistent, diarrhoea may 

 be manifested, and marked emaciation occurs. There may be 

 congestion of the mucosae, but petechise and extensive bloody dis- 

 coloration of the mucous membranes or skin are rarely seen. 

 Abortion is not uncommon. 



Recovery is the rule in this type of the disease, though in 

 some cases it will be delayed for weeks and may even then be im- 

 perfect. 



Lesions. In the acute types of the disease decomposition ad- 

 vances rapidly after death, and the carcass from the first exhales 

 a peculiarly heavy odor. The skin is discolored, the nasal mu- 

 cosa is the seat of a muco-purulent or sanguinolent discharge, the 

 anus is soiled with liquid faeces, the subcutaneous connective 

 tissue marked by red arborescence and blood-stained areas, or by 

 a gelatinoid exudation, the muscles at times deeply colored and 

 petechiated, the lymph glands, especially the bronchial and me- 

 senteric, are enlarged and congested of a deep red — the color be- 

 ing highest in the cortical zone. In some old standing cases these 

 may have softened and acquired a grayish hue. They are rich 

 in the specific bacterium. 



