382 ACUTE EXANTHEMATOUS INFECTIOUS DISEASES 



titis, tendovaginitis, open joint, etc. There are no vesicles 

 and the disease spreads slowly through a flock. 



(/) Foul-in-the-feet of Cattle, due to filthy stables and barn- 

 yards, does not affect the mouth; there are no vesicles and no 

 contagion. A malignant type of foul-in-the-feet due to the 

 necrosis bacillus and appearing in cows soon after parturition 

 or in advanced pregnancy, assumes the form of a necrosis of 

 the interdigital space which may involve the deeper struc- 

 tures (matrix, tendon sheaths, tendons, joints). It is 

 attended by fever when secondary infection is present. The 

 mouth is not involved. 



ig) Infectious Vesicular Stomatitis. — This disease, while it 

 occasionally attacks cattle, is most often seen in horses. It 

 does not seem to affect sheep and swine. It rarely attacks 

 the feet. Its spread through a herd is not so rapid and does 

 not involve so high a percentage of animals as does foot-and- 

 mouth disease. The mouth eruption in infectious vesicular 

 stomatitis is continuous or progressive, different stages 

 coexisting, which is not true of foot-and-mouth disease. 

 Differing from foot-and-mouth disease, straining the vesicular 

 fluid through a Berkefeld filter causes it to lose its virulency. 



The indications which point to foot-and-mouth disease in 

 a recently recovered animal are : Ptyalism (usually profuse) ; 

 yellow cicatrices or areas on gums and dental pad; small, red 

 spots and erosions in the gums and borders of the muzzle. 

 These traces are said to persist for several weeks. 



Course. — In most outbreaks the course is benign. Indivi- 

 dual vesicles usually heal in five to six days, but as they do not 

 all erupt at the same time, the diuation is often extended two 

 to three weeks. The mouth lesions heal more rapidly than 

 do those of the feet. As all animals are not infected simul- 

 taneously, an outbreak will last in a given barn one to two 

 months. 



In calves (under two months) the course is more rapid and 

 fatal (toxemia, septicemia, pyemia, gangrenous pneumonia, 

 heart muscle degeneration) leading to death in three to foiu- 

 days. 



From resulting foot troubles (panaritium, suppurative 

 tendovaginitis, open joint, interdigital ulceration), loss of 



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