SPECIAL BACTERIOLOGY 
143 
ferments and produces gas on dextrose (glucose, or grape 
sugar), lactose (milk sugar), maltose (malt sugar), levu- 
lose (fruit sugar), galactose and mannite, but neither 
ferments nor produces gas on saccharose (cane sugar). 
IV. Destruction 
Colon bacillus is readily destroyed by heating to 58° C. 
for ten minutes, cold affects it less, and ordinary disin¬ 
fectants readily kill it. Excessive alkaline reaction in¬ 
hibits its growth. 
Fig. 27.—Bacillus coli. Film preparation from a pure culture. x 1000. 
(Hewlett —Manual of Bacteriology .) 
V. Disease Production, Mode of Infection, Disinfec¬ 
tion and Prophylaxis 
The colon bacillus is normally found in the intestine of 
both man and animal, also occasionally found in soil, 
water and milk. Its presence in nature usually means 
contamination from animal or human sources. In the 
human intestine it is found in greatest numbers near the 
junction of the small and large intestine. 
