Symptoms. 



823 



Prince & Lafosse observed after the infectious coitus an incubation of 7-60 

 days, Hertwig 2-8 days (?), EodlofC 8-14 days. Schneider & Buffard, also Baldrey, 

 observed recently in experimental infections the development of the first symptoms, 

 or at least the first febrile attacks after 8-20 days. Buoy after 40-45 days, Marek 

 after 5-33 days. 



Trypanosomes may sometimes be demonstrated in the urethral or vaginal 

 secretion as early as 4-5 days after the infection; in spite of this, however, except- 

 ing the rise of temperature, the local symptoms may not develop for months 

 (according to Kern sometimes only after 9 months). ' 



In stallions tlie disease visually commences with an edema- 

 tous infiltration of the sheath, which gradually extends from 

 one place over the entire skin of the part, and especially to 

 the anterior pendulous portion. The swollen sheath does not 



Fig. 144. Dourine. Swelling of the sheath and the lower chest; plaques on the 

 croup and on the neck of a stallion. 



feel warmer and is not painful. It is of doughy consistence, 

 resembling somewhat a fat bag, only that the skin is stretched 

 and not wrinkled (Fig. 144). The swelling spreads along both 

 folds which pass from the orifice of the sheath to the abdomen 

 and forwards and backwards to the scrotum. At the same 

 time the glans penis also swells and the animal protrudes a 

 longer or shorter portion of this organ from the sheath. The 

 glans proper shows hardly any perceptible changes, excepting 

 the edematous swelling which however may also be very slight, 

 and a grayish transparent, or yellowish-gray mucus oozes out 



