A NEW PATHOGENIC BACILLUS 
389 
Summary of the Bacteriological Features 
Cases in which bacilli were isolated, 10. 
From blood 
„ urine 
,, faeces 
,, costochondral abscess 
None isolated in four cases. 
Time of isolation — 
During first week of illness 
„ second „ „ 
third „ 
„ fourth „ „ 
,, seventh ,, „ 
Nine months after illness . 
Serum-reaction of patients — 
Negative with B. typhosus . 14 
Positive with bacillus isolated from 
same patient . . -9 
Positive with bacillus isolated from 
another patient . . 4 
Identification of the Bacilli Isolated 
Gilbert,' 3 in 1895, pointed out that there were bacteria allied to B. coli, but 
with greater pathogenicity. He called these ' Para Coli ' and divided them into five 
groups. Most of the bacilli reported in the above table belong, evidently, to his 
third group, consisting of organisms not fermenting lactose. 
A clearer classification was made in 1898 by Durham, 8 who rearranged the 
so-called ' typhoid-colon ' group into three groups, readily differentiable by means of 
their action in various sugar media. His classification is as follows :— 
I. B. typhosus and its allies; produce acid but no gas bubbles in glucose ; 
do not attack lactose. 
II. B. enteritidis and its allies; produce acid and gas in glucose ; do not 
attack lactose. 
III. B. coli and its allies ; produce acid and gas in both glucose and lactose. 
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