TREATMENT OF CHOLERA 253 



be brought home and turned into the same feed lots with hogs 

 which are not protected by proper immunization treatment. 

 These cattle no doubt carried with them germs of the disease from 

 the infected area in Kansas, where they had been pastured on 

 infected feed lots. This would seem the more likely as the type 

 of the disease which was developed in Iowa was very similar in 

 character to that prevaihng in Kansas. 



The use of cars which were also likely infected was another 

 point which would aid in the gathering of cholera germs upon the 

 feet of the cattle. Cattle coming from an infected district and 

 shipped in cholera-infected cars could hardly escape carrying 

 with them sufficient of the cholera virus to sow the seeds of an 

 outbreak in the new pastures into which they might be turned when 

 brought home. 



When we add to this the fact that the herd was unloaded 

 through infected chutes into pens which had undoubtedly been 

 occupied at some previous time by infected hogs, there can be 

 very little difficulty in seeing why the outbreak of cholera followed 

 so closely upon the arrival of the cattle from Kansas. 



In addition to these points, we also have the Ukelihood of the 

 owner himself carrying with him on his boots hog-cholera manure 

 and mud from the Kansas feed lots which he visited while purchas- 

 ing the cattle that were to be shipped to his own farm for feeding 

 purposes. 



An instructive example of the dangers which are found even in 

 country public stock-yards is to be seen in the following experience 

 of a stockman and feeder in southern Iowa: This man had just 

 purchased a large herd of cattle at one of the principal market 

 centers, and shipped them to his farm for feeding purposes. He 

 concluded that he also wanted to turn a drove of hogs into the feed 

 lots with the cattle to gather up the droppings from the cattle. 

 He, accordingly, went down into the northern part of Arkansas 

 and bought up a drove of over 250 head of perfectly healthy hogs. 

 These animals were purchased in a district where there had been 

 no cholera for two years and no cholera was present there or in the 

 immediate vicinity at the time. 



The hogs were shipped north, and on the way were unloaded for 

 feed and water at a small railroad center in central Missouri. 



