Types of germs

Species isolated

False positive Nitrite (+) n (%)

False negative

Nitrite (−) n (%)

GNB enterobacteria

E. coli

66 (60.55)

-

43 (75)

K. pneumoniae

11 (10.09)

-

11 (19)

E. cloacae

4 (3.67)

-

3 (4)

P. mirabilis

1 (0.92)

-

1 (2)

Non-fermentative GNB

Acinetobacter sp

6 (5.5)

2 (50)

-

Pseudomonas sp

4 (3.67)

2 (50)

-

Gram-positive cocci

S. aureus

1 (0.92)

0

-

S. epidermidis

4 (3.67)

0

-

S. saprophyticus

3 (2.75)

0

-

Yeast

C. albicans

9 (8.26)

0

-

Error rate

4.5%

49.5%