Table 1.
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Direct MALDI-TOF MS identification of Gram-negative isolates (n = 2354) from Gram-negative positive BCs using Rapid MBT Sepsityper® protocol

Gram-negative organismNo. of isolatesMonomicrobial cultures (n = 2133)Polymicrobial cultures (n = 141)
Identified (%) score ≥1.8Identified (%) score ≥1.8
Enterobacterales18171615/1660 (97.3)69/157 (43.9)
 Escherichia coli797737/754 (97.7)19/43 (44.2)
 Klebsiella pneumoniae493446/452 (98.7)22/41 (53.6)
 Enterobacter cloacae complex159137/142 (96.5)8/17 (47)
 Klebsiella oxytoca6051/52 (98.1)3/8 (37.5)
 Serratia marcescens8071/74 (95.9)3/6 (50)
 Klebsiella aerogenes4638/41 (92.6)2/5 (40)
 Proteus mirabilis6241/43 (95.3)6/19 (31.6)
 Citrobacter koseri2823/24 (95.8)1/4 (25)
 Citrobacter freundii1816/16 (100)1/2 (50)
 Klebsiella variicola1410/11 (90.9)1/3 (33.3)
 Morganella morganii1610/11 (90.9)2/5 (40)
 Salmonella enterica77/7 (100)
 Pantoea agglomerans97/8 (87.5)0/1 (0)
 Hafnia alvei98/8 (100)1/1 (100)
 Pantoea eucrina11/1 (100)
 Pantoea septica32/3 (66.7)
 Providencia rettgeri11 (100)
 Providencia stuartii31 (100)0/2 (0)
 Serratia liquefaciens32/3 (66.7)
 Raoultella ornithinolytica22/2 (100)
 Serratia rubidea11/1 (100)
 Yersinia enterocolitica11/1 (100)
 Proteus vulgaris32/3 (66.7)
 Klebsiella ozaenae10/1 (0)
Non-fermenting species456316/394 (80.2)6/62 (9.7)
 Pseudomonas aeruginosa283217/243 (89.3)4/40 (10)
 Acinetobacter baumannii complex complexcomplex11270/97 (73.7)1/15 (6.7)
 Stenotrophomonas maltophilia189/13 (69.2)0/5 (0)
 Aeromonas caviae42/4 (50)
 Burkholderia cenocepacia21/2 (50)
 Achromobacter xylosoxidans107/9 (77.8)1/1 (100)
 Acinetobacter lwoffii53/5 (60)
 Acinetobacter radioresistens11 (100)
 Aeromonas veronii11 (100)
 Pseudochrobactrum asaccharolyticum10/1 (0)
 Pseudomonas chlororaphis10/1 (0)
 Pseudomonas pseudomallei10/1 (0)
 Pseudomonas monteilii10/1 (0)
 Pseudomonas putida11/1 (100)
 Stenotrophomonas rhizophila11/1 (100)
 Acinetobacter ursingii30/2 (0)0/1 (0)
 Acinetobacter vivianii10/1 (0)
 Acinetobacter guillouiae10/1 (0)
 Ochrobactrum anthropi31/3 (33.3)
 Paracoccus yeei30/3 (0)
 Roseomonas mucosa11/1 (100)
 Rhizobium radiobacter10/1 (0)
 Cupriavidus basilensis11/1 (100)
Obligate anaerobic species4016/38 (42.1)0/2 (0)
 Bacteroides fragilis2811/26 (42.3)0/2 (0)
 Bacteroides vulgatus21/2 (50)
 Leptotrichia spp.20/2 (0)
 Fusobacterium gonidiaformans11 (100)
 Parabacteroides goldsteinii11/1 (100)
 Prevotella denticola11/1 (100)
 Prevotella melaninogenica11/1 (100)
 Prevotella baroniae10/1 (0)
 Bacteroides uniformis10/1 (0)
 Bacteroides pyogenes10/1 (0)
 Bacteroides thetaiotaomicron10/1 (0)
Other species4117/41 (41.5)
 Campylobacter jejuni165/16 (31.2)
 Campylobacter coli11/1 (100)
 Campylobacter fetus31/3 (33.3)
 Eikenella corrodens10/1 (0)
 Haemophilus influenzae52/5 (40)
 Capnocytophaga canimorsus10/1 (0)
 Leptotrichia trevisanii20/2 (0)
 Neisseria meningitidis10/1 (0)
 Neisseria gonorrhoeae11/1 (100)
 Moraxella liquefaciens21/2 (50)
 Moraxella nonliquefaciens11/1 (100)
 Moraxella osloensis75/7 (71.4)
Gram-negative organismNo. of isolatesMonomicrobial cultures (n = 2133)Polymicrobial cultures (n = 141)
Identified (%) score ≥1.8Identified (%) score ≥1.8
Enterobacterales18171615/1660 (97.3)69/157 (43.9)
 Escherichia coli797737/754 (97.7)19/43 (44.2)
 Klebsiella pneumoniae493446/452 (98.7)22/41 (53.6)
 Enterobacter cloacae complex159137/142 (96.5)8/17 (47)
 Klebsiella oxytoca6051/52 (98.1)3/8 (37.5)
 Serratia marcescens8071/74 (95.9)3/6 (50)
 Klebsiella aerogenes4638/41 (92.6)2/5 (40)
 Proteus mirabilis6241/43 (95.3)6/19 (31.6)
 Citrobacter koseri2823/24 (95.8)1/4 (25)
 Citrobacter freundii1816/16 (100)1/2 (50)
 Klebsiella variicola1410/11 (90.9)1/3 (33.3)
 Morganella morganii1610/11 (90.9)2/5 (40)
 Salmonella enterica77/7 (100)
 Pantoea agglomerans97/8 (87.5)0/1 (0)
 Hafnia alvei98/8 (100)1/1 (100)
 Pantoea eucrina11/1 (100)
 Pantoea septica32/3 (66.7)
 Providencia rettgeri11 (100)
 Providencia stuartii31 (100)0/2 (0)
 Serratia liquefaciens32/3 (66.7)
 Raoultella ornithinolytica22/2 (100)
 Serratia rubidea11/1 (100)
 Yersinia enterocolitica11/1 (100)
 Proteus vulgaris32/3 (66.7)
 Klebsiella ozaenae10/1 (0)
Non-fermenting species456316/394 (80.2)6/62 (9.7)
 Pseudomonas aeruginosa283217/243 (89.3)4/40 (10)
 Acinetobacter baumannii complex complexcomplex11270/97 (73.7)1/15 (6.7)
 Stenotrophomonas maltophilia189/13 (69.2)0/5 (0)
 Aeromonas caviae42/4 (50)
 Burkholderia cenocepacia21/2 (50)
 Achromobacter xylosoxidans107/9 (77.8)1/1 (100)
 Acinetobacter lwoffii53/5 (60)
 Acinetobacter radioresistens11 (100)
 Aeromonas veronii11 (100)
 Pseudochrobactrum asaccharolyticum10/1 (0)
 Pseudomonas chlororaphis10/1 (0)
 Pseudomonas pseudomallei10/1 (0)
 Pseudomonas monteilii10/1 (0)
 Pseudomonas putida11/1 (100)
 Stenotrophomonas rhizophila11/1 (100)
 Acinetobacter ursingii30/2 (0)0/1 (0)
 Acinetobacter vivianii10/1 (0)
 Acinetobacter guillouiae10/1 (0)
 Ochrobactrum anthropi31/3 (33.3)
 Paracoccus yeei30/3 (0)
 Roseomonas mucosa11/1 (100)
 Rhizobium radiobacter10/1 (0)
 Cupriavidus basilensis11/1 (100)
Obligate anaerobic species4016/38 (42.1)0/2 (0)
 Bacteroides fragilis2811/26 (42.3)0/2 (0)
 Bacteroides vulgatus21/2 (50)
 Leptotrichia spp.20/2 (0)
 Fusobacterium gonidiaformans11 (100)
 Parabacteroides goldsteinii11/1 (100)
 Prevotella denticola11/1 (100)
 Prevotella melaninogenica11/1 (100)
 Prevotella baroniae10/1 (0)
 Bacteroides uniformis10/1 (0)
 Bacteroides pyogenes10/1 (0)
 Bacteroides thetaiotaomicron10/1 (0)
Other species4117/41 (41.5)
 Campylobacter jejuni165/16 (31.2)
 Campylobacter coli11/1 (100)
 Campylobacter fetus31/3 (33.3)
 Eikenella corrodens10/1 (0)
 Haemophilus influenzae52/5 (40)
 Capnocytophaga canimorsus10/1 (0)
 Leptotrichia trevisanii20/2 (0)
 Neisseria meningitidis10/1 (0)
 Neisseria gonorrhoeae11/1 (100)
 Moraxella liquefaciens21/2 (50)
 Moraxella nonliquefaciens11/1 (100)
 Moraxella osloensis75/7 (71.4)
Table 1.
Open in new tab

Direct MALDI-TOF MS identification of Gram-negative isolates (n = 2354) from Gram-negative positive BCs using Rapid MBT Sepsityper® protocol

Gram-negative organismNo. of isolatesMonomicrobial cultures (n = 2133)Polymicrobial cultures (n = 141)
Identified (%) score ≥1.8Identified (%) score ≥1.8
Enterobacterales18171615/1660 (97.3)69/157 (43.9)
 Escherichia coli797737/754 (97.7)19/43 (44.2)
 Klebsiella pneumoniae493446/452 (98.7)22/41 (53.6)
 Enterobacter cloacae complex159137/142 (96.5)8/17 (47)
 Klebsiella oxytoca6051/52 (98.1)3/8 (37.5)
 Serratia marcescens8071/74 (95.9)3/6 (50)
 Klebsiella aerogenes4638/41 (92.6)2/5 (40)
 Proteus mirabilis6241/43 (95.3)6/19 (31.6)
 Citrobacter koseri2823/24 (95.8)1/4 (25)
 Citrobacter freundii1816/16 (100)1/2 (50)
 Klebsiella variicola1410/11 (90.9)1/3 (33.3)
 Morganella morganii1610/11 (90.9)2/5 (40)
 Salmonella enterica77/7 (100)
 Pantoea agglomerans97/8 (87.5)0/1 (0)
 Hafnia alvei98/8 (100)1/1 (100)
 Pantoea eucrina11/1 (100)
 Pantoea septica32/3 (66.7)
 Providencia rettgeri11 (100)
 Providencia stuartii31 (100)0/2 (0)
 Serratia liquefaciens32/3 (66.7)
 Raoultella ornithinolytica22/2 (100)
 Serratia rubidea11/1 (100)
 Yersinia enterocolitica11/1 (100)
 Proteus vulgaris32/3 (66.7)
 Klebsiella ozaenae10/1 (0)
Non-fermenting species456316/394 (80.2)6/62 (9.7)
 Pseudomonas aeruginosa283217/243 (89.3)4/40 (10)
 Acinetobacter baumannii complex complexcomplex11270/97 (73.7)1/15 (6.7)
 Stenotrophomonas maltophilia189/13 (69.2)0/5 (0)
 Aeromonas caviae42/4 (50)
 Burkholderia cenocepacia21/2 (50)
 Achromobacter xylosoxidans107/9 (77.8)1/1 (100)
 Acinetobacter lwoffii53/5 (60)
 Acinetobacter radioresistens11 (100)
 Aeromonas veronii11 (100)
 Pseudochrobactrum asaccharolyticum10/1 (0)
 Pseudomonas chlororaphis10/1 (0)
 Pseudomonas pseudomallei10/1 (0)
 Pseudomonas monteilii10/1 (0)
 Pseudomonas putida11/1 (100)
 Stenotrophomonas rhizophila11/1 (100)
 Acinetobacter ursingii30/2 (0)0/1 (0)
 Acinetobacter vivianii10/1 (0)
 Acinetobacter guillouiae10/1 (0)
 Ochrobactrum anthropi31/3 (33.3)
 Paracoccus yeei30/3 (0)
 Roseomonas mucosa11/1 (100)
 Rhizobium radiobacter10/1 (0)
 Cupriavidus basilensis11/1 (100)
Obligate anaerobic species4016/38 (42.1)0/2 (0)
 Bacteroides fragilis2811/26 (42.3)0/2 (0)
 Bacteroides vulgatus21/2 (50)
 Leptotrichia spp.20/2 (0)
 Fusobacterium gonidiaformans11 (100)
 Parabacteroides goldsteinii11/1 (100)
 Prevotella denticola11/1 (100)
 Prevotella melaninogenica11/1 (100)
 Prevotella baroniae10/1 (0)
 Bacteroides uniformis10/1 (0)
 Bacteroides pyogenes10/1 (0)
 Bacteroides thetaiotaomicron10/1 (0)
Other species4117/41 (41.5)
 Campylobacter jejuni165/16 (31.2)
 Campylobacter coli11/1 (100)
 Campylobacter fetus31/3 (33.3)
 Eikenella corrodens10/1 (0)
 Haemophilus influenzae52/5 (40)
 Capnocytophaga canimorsus10/1 (0)
 Leptotrichia trevisanii20/2 (0)
 Neisseria meningitidis10/1 (0)
 Neisseria gonorrhoeae11/1 (100)
 Moraxella liquefaciens21/2 (50)
 Moraxella nonliquefaciens11/1 (100)
 Moraxella osloensis75/7 (71.4)
Gram-negative organismNo. of isolatesMonomicrobial cultures (n = 2133)Polymicrobial cultures (n = 141)
Identified (%) score ≥1.8Identified (%) score ≥1.8
Enterobacterales18171615/1660 (97.3)69/157 (43.9)
 Escherichia coli797737/754 (97.7)19/43 (44.2)
 Klebsiella pneumoniae493446/452 (98.7)22/41 (53.6)
 Enterobacter cloacae complex159137/142 (96.5)8/17 (47)
 Klebsiella oxytoca6051/52 (98.1)3/8 (37.5)
 Serratia marcescens8071/74 (95.9)3/6 (50)
 Klebsiella aerogenes4638/41 (92.6)2/5 (40)
 Proteus mirabilis6241/43 (95.3)6/19 (31.6)
 Citrobacter koseri2823/24 (95.8)1/4 (25)
 Citrobacter freundii1816/16 (100)1/2 (50)
 Klebsiella variicola1410/11 (90.9)1/3 (33.3)
 Morganella morganii1610/11 (90.9)2/5 (40)
 Salmonella enterica77/7 (100)
 Pantoea agglomerans97/8 (87.5)0/1 (0)
 Hafnia alvei98/8 (100)1/1 (100)
 Pantoea eucrina11/1 (100)
 Pantoea septica32/3 (66.7)
 Providencia rettgeri11 (100)
 Providencia stuartii31 (100)0/2 (0)
 Serratia liquefaciens32/3 (66.7)
 Raoultella ornithinolytica22/2 (100)
 Serratia rubidea11/1 (100)
 Yersinia enterocolitica11/1 (100)
 Proteus vulgaris32/3 (66.7)
 Klebsiella ozaenae10/1 (0)
Non-fermenting species456316/394 (80.2)6/62 (9.7)
 Pseudomonas aeruginosa283217/243 (89.3)4/40 (10)
 Acinetobacter baumannii complex complexcomplex11270/97 (73.7)1/15 (6.7)
 Stenotrophomonas maltophilia189/13 (69.2)0/5 (0)
 Aeromonas caviae42/4 (50)
 Burkholderia cenocepacia21/2 (50)
 Achromobacter xylosoxidans107/9 (77.8)1/1 (100)
 Acinetobacter lwoffii53/5 (60)
 Acinetobacter radioresistens11 (100)
 Aeromonas veronii11 (100)
 Pseudochrobactrum asaccharolyticum10/1 (0)
 Pseudomonas chlororaphis10/1 (0)
 Pseudomonas pseudomallei10/1 (0)
 Pseudomonas monteilii10/1 (0)
 Pseudomonas putida11/1 (100)
 Stenotrophomonas rhizophila11/1 (100)
 Acinetobacter ursingii30/2 (0)0/1 (0)
 Acinetobacter vivianii10/1 (0)
 Acinetobacter guillouiae10/1 (0)
 Ochrobactrum anthropi31/3 (33.3)
 Paracoccus yeei30/3 (0)
 Roseomonas mucosa11/1 (100)
 Rhizobium radiobacter10/1 (0)
 Cupriavidus basilensis11/1 (100)
Obligate anaerobic species4016/38 (42.1)0/2 (0)
 Bacteroides fragilis2811/26 (42.3)0/2 (0)
 Bacteroides vulgatus21/2 (50)
 Leptotrichia spp.20/2 (0)
 Fusobacterium gonidiaformans11 (100)
 Parabacteroides goldsteinii11/1 (100)
 Prevotella denticola11/1 (100)
 Prevotella melaninogenica11/1 (100)
 Prevotella baroniae10/1 (0)
 Bacteroides uniformis10/1 (0)
 Bacteroides pyogenes10/1 (0)
 Bacteroides thetaiotaomicron10/1 (0)
Other species4117/41 (41.5)
 Campylobacter jejuni165/16 (31.2)
 Campylobacter coli11/1 (100)
 Campylobacter fetus31/3 (33.3)
 Eikenella corrodens10/1 (0)
 Haemophilus influenzae52/5 (40)
 Capnocytophaga canimorsus10/1 (0)
 Leptotrichia trevisanii20/2 (0)
 Neisseria meningitidis10/1 (0)
 Neisseria gonorrhoeae11/1 (100)
 Moraxella liquefaciens21/2 (50)
 Moraxella nonliquefaciens11/1 (100)
 Moraxella osloensis75/7 (71.4)
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