DOWNS: BACILLUS TYPHOSUS. 



155 



The salacin fermentation seemed variable and did not correlate 

 with any other characteristics. 



The danger of confusing nongas-producing paratyphoid strains 

 with typhosus has been recently emphasized. Ten Broek (5) re- 

 ports a nongas-producing hog-cholera bacillus which resembles in 

 some respects B. typhosus. Krumwiede (4) also reports a similarity 

 both culturally and serologically between B. pullorum and B. san- 

 guinorum and B. typhosus. Myers (6) reports the isolation of a 

 rhamnose positive typhosus from a clinical case of typhoid which 

 was also atypical in its serological reaction. It was difficult to de- 

 cide, therefore, whether No. 5 was a true but irregular typhoid or 

 a nongas-producing paratyphoid. Krumwiede (7), using the fer- 

 mentation of rhamnose as the deciding factor between typhoid and 

 paratyphoid, would place it in the para group. 



AGGLUTINATION AND ABSORPTION TESTS. 



Antigenic irregularities had been observed in this laboratory in 

 the course of routine agglutination tests on organisms isolated from 

 clinical cases of typhoid and a number of Widals. Parke-Davis 

 antityphoid serum, serum from the city laboratory of Wichita, 

 Kan., and serum sent us from the University of Chicago were used 

 in checking up the antigenic properties of the following organisms: 

 Nos. 1,2, 4, 5, 20, 50, 51 and 52. 



Culturally they were all typhoid. Nos. 50, 51 and 52 were strains 

 isolated from feces in cases resembling influenza. They are not in- 

 cluded in the other tables because of accidental loss. 



TABLE III. — Quantitative variations in agglutinations with commercial sera. 



