MICROCOCCUS OF GANGRENOUS MAMMITIS 99 



Pathogenesis. Pure cultures introduced into the teats produced 

 the disease in the cow and goat. The dogi cat, rabbit, and guinea- 

 pig remained unaffected by both intravenous and intraperitoneal in- 

 jections. 



The disease is communicated from the diseased to healthy cows by 

 the hands of the milkers, which can be prevented by disinfection of 

 the hands with 3 per cent, solution of carbolic acid. Milk from a 

 diseased cow also infects the milk from the healthy animals, rendering 

 both unfit Jar human consumption. 



MICROCOCCUS OF GANGRENOUS MAMMITIS OF MILCH 



EWES. 



This disease, also called Mai de pis araignee, causes great mortality 

 in affected ewes. 



Microscopical Appearances. According to Nocard, a very fine 

 micrococcus 0-2 /x in diameter, associated in groups of four or more, 

 never in chains. 



Staining Reactions. Stains by the Gram method. 



Biological Characters. It is a facultative anaerobic organism. 



On Gelatine Plates. Grows on the surface in round, white, liquefying 

 colonies. 



In Gelatine Stab Cultures a funnel-shaped growth occurs. 



On Agar-Agar an abundant yellowish-white growth develops. 



Blood Serum is liquefied. 



Milk becomes acid and is coagulated in twenty-four hours. 



Cultures do not remain virulent unless renewed daily. 



Pathogenesis. Cultures inoculated into the teats of a ewe 

 produce a rapidly fatal mammitis. The goat is refractory. 



Inoculations into the ordinary experiment animals cause only a 

 slight oedema, while in the rabbit an abscess forms, from which it 

 recovers. 



DIPLOCOCCUS OF PLEURO-PNEUMONIA CONTAGIOSA 

 OF THE HORSE (SCHUTZ). 



(Ger. Breustseuche der Pferde.) 



The Schutz bacterium is a small, slightly ovoid organism, 

 sometimes possessing a capsule, found in the pulmonary tissue, and 

 exudative pleuritis generally present in contagious pleuro-pneumonia 

 of the horse. 



Staining Reactions. The organism stains easily with gentian 

 violet or methylene blue. The Gram stain only gives positive results 



