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Table 1 List of the microorganisms identified by routine method and direct in house method

From: Rapid direct identification of positive paediatric blood cultures by MALDI-TOF MS technology and its clinical impact in the paediatric hospital setting

List of microorganisms identified by routine methods/number of isolates

Number of isolates identified by MALDI-TOF MS at the species level

Number of isolates identified by MALDI-TOF MS at the genus level only

Isolates not identified by MALDI-TOF MS

Isolates with discordant results

Sensitivity (%)

Specificity (%)

PPV (%)

NPV (%)

Staphylococcus aureus (36)

36

 

100

100

100

100

Staphylococcus epidermidis (46)

45

1

 

82.1

97.9

93.3

94.2

Staphylococcus hominis (9)

8

1

 

Staphylococcus haemolyticus (2)

2

 

Staphylococcus capitis (3)

2

1

 

Staphylococcus cohnii (1)

1

 

Staphylococcus simulans (2)

2

 

Kocuria kristinae (1)

1

 

Dolosigranulum pigrum (1)

1

 

Rothia mucilaginosa (2)

2

 

Micrococcus luteus (16)

7

9

L. monocytogenes (2)

L. adecarboxylata (2)

P. baroniae (1)

Micrococcus terreus (1)

1

 

Total GPC resembling Staphylococcus (120)

105

1

14

 

88.3

97.5

95.5

93.2

Streptococcus agalactiae (7)

6

1

     

Streptococcus pneumoniae (6)

5

1

 

Streptococcus mitis/oralis group (9)

5

4

 

Streptococcus parasanguinis (2)

2

 

Streptococcus sanguinis (1)

1

 

Streptococcus intermedius (1)

1

 

Other Viridans group of Streptococci (6)

2

4

 

Streptococcus constellatus (1)

1

 

Granulicatella adiacens (1)

1

 

Abiotrophia defective (2)

1

L. adecarboxylata (1)

Enterococcus faecalis (23)

23

 

100

100

100

100

Enterococcus faecium (2)

2

 

Total GPC resembling Streptococcus (61)

47

2

12

 

80.3

99.6

98

95.5

Clostridium perfringen (2)

2

     

Clostridium septicum (1)

1

 

Bacillus cereus (5)

4

1

 

Bacillus megaterium (1)

1

 

Bacillus altitudinis/pumilus (1)

1

 

Brevibacterium luteolum (1)

1

 

Bacillus simplex (1)

1

 

Bacillus gibsonii (1)

1

 

Dermabacter hominis (1)

1

 

Actinomyces viscosus (1)

1

 

Curtobacterium flaccumfaciens (1)

1

 

Dietzia cinnamea (1)

1

S. cornosus (1)

Corynebacterium aurimucosum (1)

1

 

Corynebacterium spp. (2)

2

 

Total Gram positive rods (20)

12

1

7

 

65

99.7

92.9

97.7

Escherichia coli (29)

29

     

Klebsiella pneumoniae (11)

11

 

Klebsiella oxytoca (2)

2

 

Enterobacter cloacae complex (22)

21

1

 

Salmonella enterica subsp. enterica (14)

14

 

Serratia marcescens (4)

4

 

Morganella morganii (1)

1

 

Pseudomonas aeruginosa (9)

9

 

Acinetobacter radioresistans (1)

1

 

Acinetobacter lwoffii (1)

1

 

Acinetobacter ursingii (1)

1

 

Acinetobacter baumannii (1)

1

 

Acinetobacter johnsonii (1)

1

 

Stenotrophomonas maltophilia (7)

7

 

Neisseria meningitides (1)

1

 

Moraxella catarrhalis (2)

2

 

Total Gram negatives (107)

106

1

 

99

100

100

99.5

Candida albicans (1)

1

     

Candida parapsilosis (9)

9

 

Total yeast (10)

10

     
  1. MALDI-TOF matrix assisted laser desorption ionization-time of flight, PPV positive predictive value, NPV negative predictive value