308 SWINE PRACTICE 



plague found in the lung. Pleuritic complications are also the ex- 

 ception in catarrhal pneumonia. 



Treatment. — Prevention by the enforcement of sanitary regulations 

 is important. The spread of this disease seems to be favored by dry 

 weather; consequently, sprinkling pens and houses with disinfectant 

 solutions is helpful. 



Good results have been obtained by the use of bacterin prepared 

 from the B. suisepticus. The good results that may be obtained from 

 the use of bacterin depend primarily upon an accurate diagnosis. 

 In other words, it is futile to hope for good results following the 

 administration of bacterin in cases of cholera, verminous bronchitis 

 or sporadic cases of bronchial pneumonia. 



The bacterin may be injected at the base of the ear. Single doses 

 are ordinarily sufficient to produce immunity, but where one is desir- 

 ous of a more positive immunity, it is best to give a second injec- 

 tion three or four days after the first. 



The method of administering the bacterin depends upon the size 

 of the hogs and the number in question. Pigs are conveniently in- 

 jected with the swine plague bacterin by having them caught by an 

 attendant and injecting the bacterin either in the thigh or in the 

 axillary space. The site of injection should not be covered with 

 mud or dirt, but if the skin is dry, the injection may be made after 

 the application of a disinfectant. Larger hogs may be driven into 

 a chute and the injection made by introducing the needle deeply at 

 the base of the ear. The syringe and needles should be cleansed and 

 sterilized prior to use. 



Infectious Necrotic Enteritis 



Infectious necrotic enteritis is a name applied to a disease or con- 

 dition that is relatively common in swine and was formerly described 

 as chronic hog cholera or an intestinal form of cholera. This condi- 

 tion is frequently designated as "mixed infection" or intestinal 

 necrobacillosis. 



This disease has probably been more prevalent than any other in- 

 fectious disease of hogs in the corn belt of the -United States during 

 the last two or_three years. It is the most common condition found 

 in immmiized swine in which the so-called "hog cholera breaks" 

 occur. In fact, many veterinarians make no distinction between in- 

 fectious necrotic enteritis and hog cholera. It has been experiment- 

 ally demonstrated that infectious necrotic enteritis occurs independ- 



