312 SPECIFIC MICRO-ORGANISMS 



Bacillus (Bacterium) Chancri (Bacillus of Ducrey).— Ducrey 

 in 1889 found a short bacillus in the soft venereal sore known 

 as chancroid, obtained it in pure culture and produced typical 

 lesions by inoculation in man. The organism is about 0.5 X i-Sm, 

 often growing in threads. It grows on a blood-agar mixture at 

 37" C. Material for culture should be obtained from an un- 

 broken pustule or from a chancroidal bubo, so as to avoid 

 contaminating organisms. The bacillus possesses very little resist- 

 ance to drying or to germicides. Successful inoculation experi- 

 ments have been carried out on man, on monkeys and on cats. 

 Other organisms^ appear to produce soft chancre in the absence 

 of the Ducrey bacillus in some cases. 



' Herbst and Gatewood; Journ. A. M. A., 1912, Vol. LVIII, pp. 189-191. 



