Table 3.

Characteristic tests of Escherichia spp. isolates.

Characteristic tests	E. coli reaction	% of E. coli isolates	E. vulneris reaction	% of E. vulneris isolates
Gram Staining	G−, short bacilli	100	G−, short bacilli	100
MacConkey agar	Pink colony	100	Pink colony	97
Catalase Test	+	100	+	95
Oxidase Test	−	100	−	98
Indole Test	+	80	−	92
Methyle Red Test	+	80	+	88
Voges-Proskauer Test	−	70	−	89
Citrate Test	−	90	−	87
Lactose Test	+	100	+	99
Sugar Fermentation	+	95	+	98
Gelatin Hydrolysis Test	+	80	−	84
Casein Hydrolysis test	+	75	−	87
Nitrate Reduction Test	+	90	+	95
Urea Hydrolysis test	+	85	−	92
H2S on TSI	+	88	−	90
Motility	+	90	+	88

G −= gram negative; + = positive reaction; − = negative reaction.