ERP Micro December 2019

B astin et al . : J ournal of AOAC I nternational V ol . 101, N o . 5, 2018  1597

Table 2017.09C. Summary of results for the identification of Gram-negative organisms: Salmonella exclusivity

MALDI Biotyper correctly identified

MALDI Biotyper incorrectly identified as Salmonella spp.

Ref. incorrectly identified as Salmonella spp.

Other ref. incorrectly identified

Ref. correctly identified

MALDI Biotyper not tested

MALDI Biotyper total Ref. total

Organism

45

15

0

0

0

0

45

15

Providencia stuartii Ad1575 Citrobacter braakii Ad2701

45

12

0

3

0

0

45

15

45

15

0

0

0

0

45

15

Cronobacter sakazakii Ad1418

44

14

0

0

1

1

44

15

Yersinia

enterocolitica A00C066

42

14

0

0

1

3

42

15

Aeromonas

hydrophila Ad1570

45

5

0

0

10

0

45

15

Escherichia hermanii Ad457 Plesiomonas

44

15

0

0

0

1

44

15

shigelloides Ad673

45

15

0

0

0

0

45

15

Serratia

marcescens Ad447

355 a

120 b

Total isolates

355

105

0

3

12

5

a The total numbers represent isolates analyzed on the three recommended culture medias: Tryptic Soy Agar, Xylose Lysine Deoxycholate, and RAPID’ Salmonella . b Reference method performed from Tryptic Soy Agar only.

Table 2017.09D. Summary of results for the confirmation of Gram-negative Salmonella : exclusivity

MALDI Biotyper correctly confirmed

MALDI Biotyper incorrectly confirmed as Salmonella spp.

Ref. incorrectly confirmed as Salmonella spp.

Ref. correctly confirmed

MALDI Biotyper not tested

MALDI Biotyper total

Organism

Ref. total

P. stuartii Ad1575 C. braakii Ad2701 C. sakazakii Ad1418

45 45 45

15 12 15

0 0 0

0 3 0

0 0 0

45 45 45

15 15 15

Y. enterocolitica A00C066

44

15

0

0

1

44

15

A. hydrophila Ad1570 E. hermanii Ad457 P. shigelloides Ad673 S. marcescens Ad447

42 45 44 45

15 15 15 15

0 0 0 0 0

0 0 0 0 3

3 0 1 0 5

42 45 44 45

15 15 15 15

117 a

355 b

120 c

Total isolates

355

a 117 Isolates correctly confirmed as non- Salmonella and 105 isolates correctly identified. b The total numbers represent isolates analyzed on the three recommended culture medias: Tryptic Soy Agar, Xylose Lysine Deoxycholate, and RAPID’ Salmonella . c Reference method performed from Tryptic Soy Agar only.