170 ANNUAL REPORT OF THE OS. Doc. 



On account of obtaining no reactions on this test and having a 

 fear of injecting tuberculin loo frequently, thereby destroying the 

 sensitiveness of the body cells to the same no other test was made 

 until the following year. 



Result of Tuberculin Test, 1910. 



Date of test, May. 



Number of animals tested, 151 



Number of animals reacted, 5 



Percentage of reacting animals, 3.3 



The explanation for the reinfection of the herd the second time 

 is as follows: At the time of the test in November 1908, two cows 

 gave a rather definite reaction. Inasmuch as they were valuable ani- 

 mals it was the owner's desire that they be held for a retest, which 

 was granted. The history and tuberculin test of these two animals 

 is rather interesting and T shall give the same in detail. The ani- 

 mals are known as Proceda and Francelmar. The test of 1908 in 

 which they gave positive reactions is as follows: 



TUBERCULIN TEST 



Proceda. Francelmar. 



Preliminary temperatures.. Preliminary temperatures. 



Nov. 20, 1908. 



5 A. M. 101.4 101.4 



7 A. M. 102 102. 



9 A.M. 101. G 101.8 



11A.M. 101.6 101.6 



1 P. M. 100.6 100.2 



3 P. M. 101 101.6 



5 P.M. 101.6 102.4 



Eight P. M. Injected — Dosage, 1 drachm of solution for each ani- 

 mal containing 1,200 milligrams concentrated tuberculin. 



Temperatures following injection. Temperatures following injection. 



Nov. 21, 1908. 



5 A. M. 101.4 100.6 



7 A.M. 102.2 101.4 



9 A.M. 102.2 100.8 



11 A. M. 102.4 101.6 



1 P. M. 104.6 102.2 



3 P. M. 106.6 104. 



5 P. M. 105 105. 



7 P. M. 105.4 106. 



I beg to call your attenti(m to the fact that the rise of tempera- 

 ture did not occur until the seventeenth hour, though the reaction 

 in both cases was very distinct. There have been many cases come 

 to my attention while State ^Veterinarian of Pennsylvania and at 

 other times, when the veterinarian applying the tuberculin test felt 



