TABLE 1.

Biochemical reactions for differentiation of 122 Klebsiella isolates

Biochemical testNo. (%) of isolates with positive testa
K. pneumoniae/K. variicolaK. pneumoniaebK. variicolabK. oxytocaR. planticola
Lactose/sucrose101 (99)25 (100)5 (100)19 (100)1
H2S00000
Indole00019 (100)1
Motility00000
Citrate102 (100)25 (100)5 (100)19 (100)1
Lysine99 (97)23 (92)4 (80)19 (100)1
Ornithine00000
Arginine00000
Phenylalanine00000
Methyl red5 (5)3 (12)2 (40)3 (16)1
Voges-Proskauer98 (96)23 (92)3 (60)19 (100)0
Urease100 (98)23 (92)5 (100)19 (100)1
Adonitol89 (87)22 (88)1 (20)NTcNT
Malonate96 (94)21 (84)5 (100)18 (95)1
l-sorbose47 (46)13 (52)5 (100)19 (100)1
Growth at 10°C00019 (100)1
Histamine00001
d-melezitose00016 (84)0
  • a For K. pneumoniae/K. variicola, n = 102; for K. pneumoniae, n = 25; for K. variicola, n = 5; for K. oxytoca, n = 19; for R. planticola, n = 1.

  • b Includes only isolate with identification to species level by rpoB sequencing.

  • c NT, not tested.