CHAPTER XV 
THE B. PARATYPHOSUS A AND B. THE B. FECA- 
LIS ALCALIGENES. THE B. PROTEUS. 
DYSENTERY BACILLI 
B. Paratyphosus A and B 
The paratyphoid bacilli cause a disease which simu¬ 
lates typhoid fever so closely that no differentiation is 
possible from the symptoms (unless it be the milder form 
of the disease when caused by the paratyphoid bacilli), 
and the diagnosis is usually made from the cultural 
study and agglutination (see the table of Sugar Fer¬ 
mentations and the Bacteriologic Diagnosis of Typhoid 
Fever). Of the two types of the paratyphoid bacilli, B 
is of much more importance than A. 
B. Fecalis Alcaligenes 
This organism is of little pathogenic importance and 
is only interesting because of ease with which it may be 
confused with bacillus typhosus. 
It is frequently found in normal intestine and feces. 
It is differentiated from typhoid, colon, and paratyphoid 
bacilli by the fact that it does not ferment any of the 
common sugars. 
Bacillus Proteus 
Bacillus proteus possesses slight pathogenic proper¬ 
ties, but occasionally it may cause infections of the blad¬ 
der and abscesses. 
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