420 DISEASES OF CATTLE. 



Pregnant animals may abort. In pigs, sheep, and goats 

 the lesions in the foot are most common, but both forms 

 may be observed or only the mouth lesions. 



When the disease has become fully established it will 

 be found that the duration of the attack will vary 

 greatly with different animals. From 10 to 20 days 

 are usually required for the recovery of the normal 

 appetite and spirits in mild outbreaks, while the return 

 to a full flow of milk, in the case of milch cows, is 

 seldom witnessed before the arrival of the following 

 season. 



In the malignant type of the disease it requires from 

 three months to a year for an animal to recover. ' The 

 mortality, as already stated, is usually low. The disease 

 is more fatal in young animals that have been fed on 

 infected milk, and produced death in from 60 to 80 

 per cent of these cases as a result of gastro-enteritis. 

 In the present outbreak numerous new centers of 

 infection have been started among hogs and calves 

 which were fed on unpasteurized infected milk from 

 creameries. 



Diagnosis. — The recognition of this affection should 

 not, as a rule, be difficult, especially when the disease is 

 known to be in the vicinity ; in fact, the group of symp- 

 toms form a clinical picture too decided to be doubted. 

 The combination of high fever, vesicular inflammation 

 of the mouth, and hot, painful; swollen condition of the 

 feet, followed 24 to 48 hours later by the appearance of 

 numerous blisters varying in size from that of a pea to 

 that of a walnut on the udder and feet and in the mouth 

 should prevent any serious or long-continued error in 

 the diagnosis. However, in the inoculation of calves we 

 have a certain and final test. In 24 to 96 hours after 



