Character BT1 BT2 BT3 BT4 BT5 BT6
  Morphology Gram negative, motile Gram positive, non-motile Gram negative, motile Gram negative, motile Gram negative,non-motile Gram negative, motile
Catalase test +ve +ve +ve +ve +ve +ve
Methyl red test -ve +ve -ve +ve -ve +ve
Voges-Proskaur +ve +ve -ve -ve +ve -ve
Indole test +ve -ve +ve +ve -ve -ve
Citrate test _ve _ve +ve _ve +ve +ve
Nitrate test +ve +ve +ve +ve _ve +ve
Urease test _ve +ve _ve _ve +ve _ve

Table 2: Morphological and biochemical characteristics of the isolates BT1, BT2, BT3, BT4, BT5, BT6.