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Table 2 Direct MALDI-TOF results in monomicrobial cultures

From: Evaluation of three sample preparation methods for the direct identification of bacteria in positive blood cultures by MALDI-TOF

Bacterial Group

Cut off value

Identified using Saponin (%)

Identified using SDS (%)

Identified using SepsiTyper (%)

Total

Concordant

Discordant

No ID

Concordant

Discordant

No ID

Concordant

Discordant

No ID

Staphylococci and Micrococci

≥2.000

33 (50)

0 (0)

33 (50)

35 (53)

0 (0)

31 (47)

37 (56)

0 (0)

29 (44)

66

≥1.700

55 (83)

1 (2)

10 (15)

51 (77)

1 (2)

14 (21)

51 (77)

1 (2)

14 (21)

66

Enterobacteriaceae

≥2.000

27 (77)

0 (0)

8 (23)

32 (91)

0 (0)

3 (9)

34 (97)

0 (0)

1 (3)

35

≥1.700

30 (86)

0 (0)

5 (14)

33 (94)

0 (0)

2 (6)

33 (94)

0 (0)

2 (6)

35

Streptococci and Enterococci

≥2.000

0 (0)

0 (0)

18 (100)

9 (50)

0 (0)

9 (50)

10 (56)

0 (0)

8 (44)

18

≥1.700

4 (22)

0 (0)

14 (78)

9 (50)

0 (0)

9 (50)

10 (56)

0 (0)

8 (44)

18

Other Gram negatives

≥2.000

9 (69)

0 (0)

4 (31)

8 (62)

0 (0)

5 (38)

8 (62)

0 (0)

5 (38)

13

≥1.700

10 (77)

0 (0)

3 (23)

8 (62)

0 (0)

5 (38)

9 (69)

0 (0)

4 (31)

13

Other Gram positives

≥2.000

0 (0)

0 (0)

12 (100)

2 (17)

0 (0)

10 (83)

2 (17)

0 (0)

10 (83)

12

≥1.700

1 (8)

0 (0)

11 (92)

2 (17)

0 (0)

10 (82)

3 (25)

1 (8)

8 (67)

12

Total

≥2.000

69 (48)

0 (0)

75 (52)

86 (60)

0 (0)

58 (40)

91 (63)

0 (0)

53 (37)

144

≥1.700

100 (69)

1 (1)

43 (30)

103 (72)

1 (1)

40 (28)

106 (74)

2 (1)

36 (25)

144

  1. Concordance and discordance are with identification by conventional culture and identification
  2. Cut off value ≥1.700 = ≥1.700 and top three results matching