342 



ANTHRAX 



Great differences exist in susceptibility to anthrax in different 

 species of animals. Thus the ox, sheep (except those of Algeria, 

 which only succumb to enormous doses of the bacilli), guinea-pig, 

 and mouse are all very susceptible, the rabbit slightly less so. ' 

 We have no data to determine whether the disease occurs among 

 the last three in the wild state. Less susceptible than this 

 group are the horse, deer, and goat, in which the disease occurs 



2?*Va« 



Fig. 102.— Scraping from spleen of guinea-pig dead of anthrax, 

 showing the bacilli mixed with leucocytes, etc. (Same appearance 

 as in the ox. ) 



" Corrosive film " stained with oarbol-thionin-blue. x 1000. 



from time to time in nature. Anthrax also occurs epidemically 

 in the pig, often from the ingestion of the organs of other 

 animals dead of the disease. It is, however, doubtful if all 

 cases of disease in the pig described on clinical grounds as 

 anthrax are really such. A careful bacteriological examination 

 is here always advisable, especially of any cedematous infiltration 

 about the throat, or in the neighbouring lymphatic glands; 

 often, in pigs dying of anthrax, bacilli may not occur in the 

 blood. Any hemorrhagic infarction in the spleen of a suspected 

 animal should be carefully investigated. The human subject 



