OTHER ORGANISMS CONTAINING SALMONELLA ANTIGENS 745 



few of them form indole or liquefy gelatin. None of them has yet been shown to be 

 pathogenic to man, but there is strong reason to believe that some are pathogenic to 

 animals (Edwards, Cherry and Bruner 1943). 



Of the Flexner dysentery bacilli, two strains were shown by agglutination, absorption, 

 and production of antibody tests to contain O antigens VI and XIII, and 14 other strains 

 were agglutinated by sera containing VI and XIII antibodies (Bornstein, Saphra and 

 Daniels 1941). 



Though Kauffmann (1941) has included five types of coliform and paracolon bacilli 

 in his diagnostic table under the name of Salmonella colt 1, 2, 3, 4, 5, there seems little 

 justification for regarding these organisms as members of the Salmonella group. Our 

 present knowledge suggests that Salmonella antigens are by no means uncommon in the 

 Bacterium group. In our own laboratory we have met several such strains ; and it may 

 well be that, when they are looked for, they will be found to be widely distributed. As 

 we have already pointed out, it is doing violence to the principles of taxonomy to include 

 every organism in the Salmonella group merely because it contains some antigenic fraction 

 that has hitherto been regarded as peculiar to this group. The main interest of these 

 organisms is that they serve as pitfalls for the unwary ; and that unless a proper study 

 of the cultural and biochemical behaviour of every strain suspected of being a Salmonella 

 is made, in addition to a serological examination, they are liable to give rise to false positive 

 results from time to time. Admittedly, there are intermediate strains such as those 

 described by Edwards, Cherry and Bruner (1943), some of which appear to be pathogenic, 

 which are at present very difficult to classify ; but it will be wise for the moment to 

 maintain a conservative attitude, and to include in the Salmonella group only those 

 organisms possessing the general, as well as the antigenic characters, of accepted members 

 of this group. 



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