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Table 4 Performance evaluation of BSI-HMGS combined with the pre-treatment protocol on simulated whole blood samples

From: Rapid and precise identification of bloodstream infections using a pre-treatment protocol combined with high-throughput multiplex genetic detection system

Pathogens

HMGS

Reference results

PPA

NPA

OPA

 

+

−

K. pneumoniae

+

29

0

0.967

1.000

0.999

 

−

1

690

   

B. cepacia

+

29

0

0.967

1.000

0.999

 

−

1

690

   

P. mirabilis

+

26

0

0.867

1.000

0.994

 

−

4

690

   

M. catarrhalis

+

28

0

0.933

1.000

0.997

 

−

2

690

   

S. marcescens

+

27

0

0.900

1.000

0.996

 

−

3

690

   

H. influenzae

+

26

0

0.867

1.000

0.994

 

−

4

690

   

P. aeruginosa

+

25

0

0.833

1.000

0.993

 

−

5

690

   

E. cloacae complex

+

30

0

1.000

1.000

1.000

 

−

0

690

   

E. coli

+

30

0

1.000

1.000

1.000

 

−

0

690

   

A. baumannii

+

29

0

0.967

1.000

0.999

 

−

1

690

   

S. maltophilia

+

24

0

0.800

1.000

0.992

 

−

6

690

   

S. enterica

+

28

0

0.933

1.000

0.997

 

−

2

690

   

Staphylococcus

+

27

0

0.900

1.000

0.996

 

−

3

690

   

S. aureus

+

29

0

0.967

1.000

0.999

 

−

1

690

   

Streptococcus

+

29

0

0.967

1.000

0.999

 

-

1

690

   

S. pyogenes

+

29

0

0.967

1.000

0.999

 

−

1

690

   

S. agalactiae

+

25

0

0.833

1.000

0.993

 

−

5

690

   

S. pneumoniae

+

30

0

1.000

1.000

1.000

 

−

0

690

   

E. faecalis

+

30

0

1.000

1.000

1.000

 

-

0

690

   

E. faecium

+

29

0

0.967

1.000

0.999

 

−

1

690

   

C.albicans

+

26

0

0.867

1.000

0.994

 

−

4

690

   

C. tropicalis

+

24

0

0.800

1.000

0.992

 

−

6

690

   

C. parapsilosis

+

27

0

0.900

1.000

0.996

 

−

3

690

   

C. glabrata

+

25

0

0.833

1.000

0.993

 

−

5

690

   
  1. The number of Staphylococcus and Streptococcus represent the number of pathogens with a single Staphylococcus and Streptococcus peak, respectively, excluding the two-peak pathogens. HMGS: high-throughput multiplex genetic detection system; PPA: positive percent agreement; NPA: negative percent agreement; OPA: overall percent agreement