782 r.oAun of agriculture. 



safe to couclude tbat one or both of tliese diseases are preseut. We have 

 no other widespread diseases of hogs causing such loss. 



Hog elioleia is sometimes mistalven for other diseases, as worufs, diar- 

 rhea or scours, sei)ticemiu or Ijlood poisoning, etc. Swine plague is fn>- 

 queutly mistaken for pneumonia, pleurisy and bronchitis. 



In some places the intestinal worms become so numerous as to cause 

 all the intestinal symptoms ascribed to cholera, vomiting, diarrhea, de 

 praved appetite and emaciation. The onset of the trouble is not so 

 sudden; there is not the same temperature, usually no lameness, and no 

 skin eruption. The worms causing the trouble may be the large intestinal 

 worms, the size of a lead pencil or larger, or the small fellows from ono- 

 lialf to three inches in length. A post-mortem will show the presence of 

 the parasites in great numbers and the intestines will be more or less ir- 

 ritated. The presence of the parasites causes so much loss that some of 

 the cliolera cures are nothing but vermifuge powders. The lung worm 

 may also produce symptoms that will be mistaken for swine plague. 



Diarrhea, or scours, may also be mistaken for cholera, as it is often 

 induced by a change of feed, as turning upon new corn, feeding city 

 .slops that contain soap and sour feed. The discharges are usually more 

 tluid and of a lighter color than in cholera. The disease can not be dis- 

 tinguished in the early stages, but a change to a lirpited dry diet will 

 usually be all that is necessary to bring about the desired result in the 

 diarrheal trouble. 



A form of septicemia, or blood poisoning, sometimes al tacks a bunch 

 of pigs, and, being contagious, spreads from one to another. The mouth, 

 nose, lips, tongue, feet or other parts of the body become gangrenous. 

 While the disease presents some of the symptoms of cholera, the localiza- 

 tion of the trouble is sufficient to make a diagnosis. 



Hogs will pile up in bunches when not properly divided and protected 

 during the cold weather, and as a result catch more or less severe colds, 

 resulting in bronchitis, pneumonia and pleurisy, giving rise to symptoms 

 like those of swine plague. The same troubles may also appear as a re- 

 .sult of turning hogs upon a stubble or pasture field during very hot 

 weather and then permitting them to have access to cold springs or 

 brooks In which to wallow. These same troubles sometimes arise from 

 the inhalation of dust. A study of the conditions will usually suffice to 

 differentiate the troubles. 



Number of Animals Affected, and Immunity.— When an outbreak of 

 cholera occurs in a neighborhood we can not judge Mhat per cent, of 

 the hogs will be affected and die. Some outbreaks have a virulent type 

 of the disease on the outset and gradually the virulence diminishes so 

 that while from eighty to one hundred per cent, of the hogs affected at 

 the outset may have died, only ten per cent, may be affected and die out 

 of herds attacked later. As a rule the disease is more virulent in type 

 when it makes its first appearance. The reverse of this is triie in 



