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Table 1 GeneXpert Ultra, phenotypic drug-susceptibility and rpoB sequencing results for 28 selected Mycobacterium tuberculosis isolates

From: GeneXpert MTB/RIF Ultra performance to detect uncommon rpoB mutations in Mycobacterium tuberculosis

Culture number

rpoB mutation(s)

Type of mutation

Appearance

WHO catalogue V1

pDST

GeneXpert Ultra (V3) result

Final confidence grading

Presence among (SOLO)RR isolates

LJ

MGIT

Report

Per probe analysis based on Tm for combo mutants

CT2005-00009

Ins431(agCCAc); P439L

INDEL-no fs

Combo

No data; Ass w R-int

No data; 0

RMP-R

NT

No R detected

No R detected; No R detected

CT2008-02955

Del427-428(ACCAGC)a

INDEL-no fs

Single

Not ass w Rb

No data

RMP-Se

RMP-Sd

Indeterminate

 

CT2005-02316

Del437(AAC)

INDEL-no fs

Single

Ass w R-intb

No data

RMP-R

RMP-R

R detected

 

CT1993-09583

H445R; N487Ha

SNP

Combo

Ass w R; uncert sign

79; 2

RMP-R

RMP-R

R detected

R detected; not applicable

CT2007-00288

D435Y; P454L

SNP

Combo

Ass w R; uncert sign

44; 6

RMP-R

RMP-Sd

R detected

R detected; R detected?

CT1998-00166

S428R; H445R

SNP

Combo

Ass w R-int; Ass w R

5; 79

RMP-R

 

R detected

R detected; R detected

CT2014-02522

Q429L; D435V

SNP

Combo

Ass w R-int; Ass w R

9; 732

RMP-R

 

R detected

R detected; R detected

CT2004-01679

S431G; S450W

SNP

Combo

Ass w R-int; Ass w R

6; 151

RMP-R

 

R detected

R detected; R detected

CT1997-01244

M434I; D435Y

SNP

Combo

Ass w R-int; Ass w R

16; 162

RMP-R

 

R detected

R detected; R detected

CT2014-00803

N437S; R447P

SNP

Combo

Ass w R-int; no data

2; no data

RMP-R

 

R detected

R detected; R detected

CT2009-01036

M434T; H445D

SNP

Combo

Ass w R-intb; Ass w R

No data; 268

  

Indeterminate

Indeterminate; R detected

CT2014-00781

D435N; S450V

SNP

Combo

Ass w R-intb; Ass w R-int

No data; 2

RMP-R

 

R detected

R detected; R detected

CT2012-00752

Q432L

SNP

Single

Ass w R

21

RMP-R

 

Indeterminate

 

CT2014-02541

Q432L

SNP

Single

Ass w R

21

RMP-R

 

Indeterminate

 

CT2008-01914

Q432K

SNP

Single

Ass w R

34

 

RMP-R

R detected

 

CT2014-01261

Q432K

SNP

Single

Ass w R

34

RMP-R

 

R detected

 

CT2013-01926

Q432P

SNP

Single

Ass w R

29

RMP-R

NT

Indeterminate

 

CT2015-00488

Q432P

SNP

Single

Ass w R

29

RMP-R

 

Indeterminate

 

CT2018-03321

S428R

SNP

Single

Ass w R-int

5

RMP-Sc

RMP-Sd

R detected

 

CT2019-04011

Q432E

SNP

Single

Ass w R-int

1

RMP-R

 

R detected

 

CT2014-00323

D435A

SNP

Single

Ass w R-int

2

RMP-Sc

RMP-Sd

R detected

 

CT2015-00705

D435A

SNP

Single

Ass w R-int

2

RMP-Sc

RMP-Sd

R detected

 

CT1997-01460

H445P

SNP

Single

Ass w R-int

5

RMP-R

RMP-R

R detected

 

CT2008-01398

H445P

SNP

Single

Ass w R-int

5

RMP-R

 

R detected

 

CT2014-00787

K446Q

SNP

Single

Ass w R-int

7

RMP-R

 

Indeterminate

 

CT2014-00789

K446Q

SNP

Single

Ass w R-int

7

RMP-R

 

Indeterminate

 

CT2014-00761

N438K

SNP

Single

Ass w R-intb

No data

RMP-R

 

R detected

 

CT2013-00428

G442R

SNP

Single

Ass w R-intb

No data

RMP-R

 

R detected

 
  1. Ass-w-R(-int) associated with resistance (interim), indel insertion/deletion, no fs no frameshift, pDST  phenotypic drug-susceptibility testing, LJ Löwenstein-Jensen medium (40 µg/ml), MGIT  Mycobacteria Growth Indicator Tube (1 µg/ml or 0,5 µg/ml for4), SNP Single nucleotide polymorphism, RMP rifampicin, R resistant(ce), S susceptible
  2. aOutside XpertUltra target region
  3. bNo data in WHO catalogue, but applying WHO rule on own pDST results
  4. cMIC ≤ 10 µg/ml
  5. eMIC of 20 µg/ml