INFECTIOUS DISEASES 315 



characterized by pulmonary symptoms, sufficiently distinctive to ex- 

 clude infectious necrotic enteritis. A combination of parasitic pneu- 

 monia and infectious necrotic enteritis may be identified by the dem- 

 onstration of parasites in the lung lesions and by the inflammatory 

 necrotic lesions in the intestine. 



Paratyphoid infections occur in swine, but the symptoms and le- 

 sions produced have not been positively determined, verified and re- 

 corded. It is probable that paratyphoid infections occur most fre- 

 quently in garbage-fed hogs. Accumulation of dar]?; colored blood in 

 the skin and subcutis producing the "blue belly" is probably a 

 characteristic lesion of paratyphoid infection. The spleen is usually 

 extensively enlarged. By a careful consideration of the foregoing 

 paratyphoid infection may be identified. 



Intestinal necrobacillosis is characterized by lesions consisting of 

 coagulation necrosis in which the necrotic tissue later becomes caseous. 

 The necrobacillosis lesions are cireuniscribed yellowish or brownisli 

 areas containing a dry, mealy, cheese-like substance emitting a pun- 

 gent disagreeable odor. 



Prognosis. — The prognosis should be guarded. If the infection is 

 relatively mild the percentage of deaths will be small but the loss of 

 condition of the affected animals may produce an extensive economic 

 loss. 



Control. — Sanitary requirements are frequently ignored by the 

 hog feeder and breeder. Although infectious necrotic enteritis may 

 occur in swine that are maintained in clean pens and properly housed 

 it is much more prevalent in swine that are kept in mud and filth. 

 There is a tendency for the larger feeders to keep too many hogs in 

 one lot, a method that is conducive to the rapid spread of any infec- 

 tious disease. Men who are most successful in swine husbandry care- 

 fully watch their herds and the first indication of anj- defect or dis- 

 ease is sufficient cause for isolation of the affected animaL Quaran- 

 tine is the first principle in controlling the spread of infection and 

 to be most effective isolation should be absolute. Rigid enforcement 

 of quarantine regulations in the early stages of infectious necrotic 

 enteritis will materially diminish the losses occasioned by this disease. 

 Stocker hogs that have been purchased and immunized at market 

 centers frequently become affected with infectious necrotic enteritis. 

 Shipped in stocker hogs or breeding hogs should be kept in quaran- 

 tine for three weeks. Slop foods of good quality should be provided 

 for affected animals. They should be kept in comfortable quarters 



