Table 3. Biochemical identification of the isolated Gram-positive and Gram-negative bacteria.

Bacteria	Catalase	Oxidase	Coagulase	Indole	MR	VP	Citrate	Urease	TSI	Nitrate	Bile esculin
E. faecalis	+	Nd	-	Nd	Nd	Nd	Nd	Nd	Nd	Nd	+
S. aureus	+	Nd	+	Nd	Nd	Nd	Nd	Nd	Nd	Nd	Nd
A. baumannii	+	-	Nd	-	-	+	+	V	nd	-	Nd
Citrobacter sp.	+	-	Nd	-	+	-	+	-	A/A H2S	+	Nd
E. aerogenes	+	-	Nd	-	-	+	+	-	A/A	+	Nd
E. coli	+	-	Nd	+	+	-	-	-	A/AG	+	Nd
K. pneumoniae	+	-	Nd	-	-	+	+	+	A/AG	+	Nd
K. oxytoca	+	-	Nd	+	-	+	+	+	A/A G	+	Nd
P. mirabilis	+	-	Nd	-	+	-	+	+	K/A H2S	+	Nd
P. vulgaris	+	-	Nd	+	+	-	+	+	K/A H2S	+	Nd
P. aeruginosa	+	+	Nd	-	-	-	+	+	Nd	+	Nd

MR: methyl red test; VP: Voges-Proskauer test; TSI: triple sugar iron test; V: variable; A/A: acid in slant and butt; A/AG H₂S: acid in slant and butt with H₂S gas production; A/AG: acid in slant and butt with gas production; K/A H₂S: alkali in slant and butt with H₂S gas production; Nd: not done; +: positive; -: negative.