INOCULATION AS A PEEVENTION OF PLEURO-PXEUMONIA. 17 



Over and over again I have seen inoculated cattle subjected 

 to the test of standing the onset of not only one, but two or 

 three outbreaks of the disease. It has been quite a common 

 thing in my experience for inoculated cattle to stand exposed to 

 the contagium of dying ones around them for days and for weeks, 

 and to remain uninjured in other cases, where freshly brought in 

 ones, not inoculated, have at once fallen victims. There can be 

 no manner of doubt about it, — " an inoculated animal, healthy 

 at the time of operation, will not afterwards contract pleuro- 

 pneumonia." 



Out of many instances in support of such a statement, I may 

 be allowed to give the following one : — A client, who has a large 

 town dairy, as also a farm some two miles or so from town, had 

 pleuro-pneumonia very badly in his town byres ; the disease had 

 been running its course for some weeks, so that at tlie time of 

 my inspection of them, more than half of his large stock were 

 affected. I inoculated all that I could make at all sure about 

 not being affected, the others being left to the care and, of 

 course, at the disposition of the local authorities' inspector. On 

 the same day I inoculated about a dozen calves, also in the town 

 byres, and up at the farm ten head of freshly bought in, and 

 very fine shorthorn milkers. Well, in a few weeks, all but two 

 or three of the uninoculated ones were condemned and slaugh- 

 tered, one or two at a time. Of course this was to be expected, 

 ^as I said we knew them to be affected. What I wish to 

 point out is, that they actually stood dying under the same roof 

 with those I had inoculated, but without injuring them. Thus 

 far the occurrence is a common one in my experience ; but, for- 

 tunately, to illustrate still more the value of the protective power 

 of inoculation, the history of this outbreak and its arrest does 

 not end just yet. The byres were quarantined for two months, 

 during which time they were thoroughly cleansed, the only 

 inmates being the few I had inoculated, as also the calves — all 

 of which were quite healthy. At the end of the two mouths, six 

 fresh cows were bought in ; they were not inoculated, for what 

 reason I do not know, unless it be that my client- wished to test 

 the matter thoroughly. In less than three months the whole 

 six were one by one put down for pleuro, the inoculated ones 

 being still well. The same process of quarantine and cleansing 

 had to be gone over, and then the premises being held clean by 

 the local authoritv, the cows which I had inoculated at the farm 

 about eight months previously, were brought in, and housed in 

 the byres so many had been sent out of. To the stock were 

 added fcur fresh ones, which again were not inoculated. It will 

 be seen that at this time there were in the b}Tes, subjected to 

 the influence of any existing contagium — 



1. The cows originally inoculated in them. 



2. The calves originally inoculated in thrm. 



B 



