726 PATHOGENIC MICROORGANISMS 



B. Ozaense. The work of Abel 15 and others has shown that ozena, 

 or fetid nasal catarrh, is almost always associated witli a bacillus 

 morphologically and culturally almost identical with B. mucosus 

 capsulatus. The bacillus can not be definitely separated from the 

 latter. According to Wilde it forms no gas in dextrose bouillon 

 and is less pathogenic for mice than B. Friedlander. Whether it is 

 a separate species, or merely an atypical form changed by environ- 

 ment, can not be stated at present. 



Perez Bacillus of Ozsena. Perez 16 in 1899 described another 

 microorganism which he connects etiologically with ozaena. The 

 Perez bacillus is Gram-negative, pleomorphic, non-motile and non- 

 capsulated. It grows easily on ordinary media, does not liquefy 

 gelatin, and makes indol. Its cultures have a characteristic fetid 

 odor. Intravenously injected into rabbits it seems to produce a 

 localized lesion in the nasal cavity on the turbinated bones. Hofer 17 

 has also isolated it, but recent work leaves its importance as the 

 causative agent in doubt. 



16 Abel, Zeit. f. Hyg., xxi. 



18 Perez, Animal de PInst. Past. 1899. 



17 Hofer, Wien. klin. Woch., vol. 26, pp. 1011 and 1628. 



