156 STATE BOARD OP AGRICULTURE. 



Hint 1ho animal reaftiii,u is iiirccicd and oven thmifjli she rarncs her calf 

 lull time aud j;ives biilli to a normal calf f<lie is to be rej;arded as capable 

 of infecting susceptible animals and should be guarded against with the 

 same precautions as though she had aborted, or may it not be possible 

 that a reaction may indicate acquired iunnnnily and not nocessarilv in- 

 Icclion? 



Wc are making a com]iarative study of these tests ^\ illi tlic objci-l of 

 determining how long a cow may react after abortion. We are also 

 making use of these tests 1o determine if jxissible the jtresencc of in- 

 fectious abortion in herds xnIhtc the owner ie<|uests it. 



(^nr investigations in search of some jjcaclical, effective method <d" con 

 trolling the disease are along the line of vaccine treatment, consisting <d" 

 the injection of dead cultures of the abortus bacillus into i>regnant ani- 

 mals and li\ing cultures into non-i»regnant animals, su]t[)lemented by 

 local applications of cnltures of Bact. bulgaricnm in cases of abortion. 

 We have about 100 animals in this experiment, a large per cent, of which 

 have received injections of the living cultures, ^fany of these animals 

 are virgin heifers in infected herds. We have been a little backward 

 in taking the work u]) on n larger scale since we do not know what 

 l>athologic and possibly serious effects these injections may have on 

 the animal. AVhile it is known that cultures of the abortus bacillus do 

 havi' a very marked ])athologic elVect on giiinea i>igs, no Avork as far as 

 we know has been done to determine their effects on catth'. We are 

 not yet ready to report on this Avork. 



AUTOPSIES AND EXAIMINATIOX OF TISSUES. 



During the ]»ast year we have conducted t).") autopsies at this labora- 

 tory, as f(dlows: 



Hogs 7 1 



Cattle 11^ 



( Ml ickens H 



Slieejt 2 



1 )ogs 12 



.\niong tlnse we liaxc found: 



Hog cholera 2(') cases 



Acute iibrinous gastritis, hog !(• " 



I )i|ththeritic enteritis, hog 2 " 



lMenro-]iiieumonia. hog 2 " 



Jironcho pneumonia, hog 2 " 



Acute gastroenteritis, liog 2 '' 



]\rulliple abscesses of liver, hog 1 " 



Tentral necrosis of liver, hog 1 " 



(Jeneralized peritonitis, hog 1 " 



Cystitis and rupture of bladder, hog 1 " 



Intestinal tuberculosis, cow 2 " 



Pulmonary tuberculosis, cow 1 " 



Caseous broncho pneumonia, cow 1 " 



Chronic indurative pneumonia, cow 1 " 



CJeneralized vesicular and interstitial emj)hy- 



sema Avitli dilatation f)r right heart, cow.. 2 " 



Uncinariasis, sheep 1 " 



Avian tuberculosis 4 " 



