242 DISEASES OF SWINE 



virus, just as certainly as if the dead carcasses had been hauled into 

 the feed lot and left for them to feed upon. 



Cholera made its appearance in the herd in about ten days, 

 and, as in most outbreaks so carried, made its appearance first in 

 the younger animals, but soon spread to the old sows, and within 

 a month or six weeks had swept the lots bare of every living hog. 



This man's experience goes to show a couple of interesting 

 points in connection with the spreading of hog-cholera. In the 

 first place, it shows again that burial is not a proper method of 

 disposing of dead cholera carcasses, and especially so when the 

 animals are not deeply buried. This case also illustrates the 

 danger of having a dog about the premises that has the habit of 

 wandering about the neighborhood and crossing from one feed 

 lot to another, carrying with him infection and disease-producing 

 material. A good dog is a valuable animal upon any farm, but a 

 straying hound is a nuisance, and is very dangerous to the health 

 of other animals, especially hogs, when there is an outbreak of 

 cholera in the neighborhood. 



Another outbreak of cholera which was widely spread through 

 improper burial of cholera carcasses was seen in northeastern 

 Nebraska. Here the outbreak started on a farm which was 

 located rather high along a certain watershed. About 300 

 yards further down the slope there was located a small run- 

 ning stream, but the hogs were not running in the same pasture 

 that the stream crossed through. -When they began to die the 

 dead animals were removed from the hog lot and taken out into 

 this second pasture and buried at a good average distance under 

 ground. 



The spring was a rather wet one, and the seepage from the 

 graves evidently was carried down the slope and entered the waters 

 of the stream, which, accordingly, became infectious and disease 

 producing. It was only a short time until further outbreaks 

 occurred on farms located further down the course of the stream, 

 and in a few weeks a widespread outbreak was in full play along 

 the entire valley. 



Here, again, we have an example of how cholera virus may be 

 carried through surface drainage and seepage to contaminate 

 streams with which the animals do not come in direct contact, and 



