Biochemical Test ADB-1 ADB-2 MH-3 MH-4 DK-5 LH-6
Catalase + + - + + -
Indole production + + + + - +
Methyl Red + + + + + +
Vogues Proskauer - - - - + -
Citrate Utilization - - + - - +
Deamination + + + + - +
Nitrate Reduction + + + + + +
Urea + - - - + -
Hydrolysis Starch + - + - + -
Casein - - + - - -
Gelatin - - - - - -
Triple sugar iron Slant AC AC AC AC AC AK
Butt AC AC AC AK AC AC
H2S - - - - - -
Gas + + - - + +
Note: + Positive test; - , Negative test; AC= Acidic reaction; AK = Alkaline Reaction
Table 7: Biochemical test of E. coli isolates.