BUREAU OF ANIMAL INDUSTRY. 241 



6 cats, 4 cattle, and 3 hogs. The rabid animals were said to have bit- 

 ten or scratched 72 persons, 2 cows, 1 horse, and 19 dogs. Most 

 of the specimens came from the District of Columbia, although Vir- 

 ginia, West Virginia, and Maryland contributed a goodly share. 

 The number of positive cases was 35 more than in the preceding year. 

 In April, May, and June 55 cases of rabies were diagnosed, and of 

 these 23 occurred in the District of Columbia, where dogs are not 

 muzzled during those months of the year. 



TUBEECUI.OSIS. 



Specimen tissues taken from 476 cattle which had reacted to the 

 tuberculin test but had shown no visible lesions of tuberculosis on 

 autopsy were examined microscopically, and 88 of the samples were 

 found to contain organizations having the characteristics of tubercle 

 bacilli. Of the total number of samples 435 were lymph glands, in 

 05 of which the organisms were found. There were 27 samples of 

 skin lesions, of which the organisms were found in 21. In addition 

 tissues from 20 calves, ranging from 2 days to 3 weeks in age, were 

 examined, and 17 proved to be tuberculous. 



A calf belonging to a tuberculosis-free herd reacted to the intra- 

 dermic tuberculin test. No source of bovine infection could be found, 

 and it was suspected that the animal might have acquired the dis- 

 ease from a caretaker who was thought to be suffering from advanced 

 pulmonary tuberculosis. The calf was slaughtered and at autopsy 

 a small, pea-sized nodule containing dry, gritty material was found 

 in one of the mesenteric lymph nodes. In this lesion were found 

 many acid-fast organisms which were proved by animal inoculation 

 and culture tests to be typical tubercle bacilli of the human type. 



GLANDEKS. 



Cooperative work in the control and eradication of glanders in 

 the various States was continued. The complement-fixation test was 

 applied to 237 samples of serum from animals suspected of being 

 affected with or exposed to glanders, and 23 gave positive reactions. 



DOURINE. 



In the course of the campaign for the control and eradication of 

 dourine 11,530 samples of blood serum from horses in districts where 

 dourine exists or is suspected to exist were subjected to the comple- 

 ment-fixation test for that disease. Three hundred and sixty-four 

 jf the samples, or approximately 3 per cent, gave positive reactions. 



TESTING ANIMALS FOR IMPORT. 



Blood serum from 174 animals offered for import, including 50 

 Army horses returned from overseas duty in Germany, were subjected 

 10 the complement-fixation test for glanders and trypanosomiasis. 



In a lot of 15 dromedaries offered for import, 5 were found to be 

 affected with trypanosomiasis. Work on the identity of the trypano- 

 some is still in progress, but there are indications that the organ- 

 ism is of the type that produces surra, a disease of high mortality 

 and one which does not exist in this country. All the affected 

 animals were destroyed. The remainder are being held in quar- 



