MORGAN BACILLUS 387 
Enzymes have not been detected in cultures of the Morgan bacilhis. 
Pathogenesis.— The etiological relationship of the Morgan bacillus 
to diarrheas is not fully established, although it has been isolated from 
many cases in which other pathogenic bacteria have not been detected, 
as well as in association with severe and fatal cases of bacillary 
dysentery.^ 
The organism is readily isolated from the feces upon the lactose agar 
medium containing the Andrade indicator. The colonies are colorless 
and resemble those of the paratyphoid bacilli very closely. The essen- 
tial points of difference from the other pathogenic intestinal bacilli 
are shown in the Table on page 353. Little is known of the lesions or 
immunological reactions of this organism. 
' Kendall, Day and Bagg: Boston Med. and Surg. Jour.. 1913, 169: 741. Kendall: 
Ibid., 1915, 172, 851. 
