| Isolates | No. | Biochemical tests | ||||||
| Catalase | Oxidase | Indole | M.R | V.P | Simmon citrate | Motility test | ||
| Eschericia coli | 44 | + | + | + | + | − | − | + |
| Proteus mirabilis | 18 | + | − | − | + | − | + | + |
| Klebsiella pneumoniae | 4 | + | + | − | − | + | + | − |
| Klebsiella oxytoca | 1 | + | + | + | + | + | + | − |
| Pseudomonas aeruginosa | 2 | + | + | − | − | − | + | + |
| Citrobacter freundii | 3 | + | + | − | + | − | + | + |
| Citrobacter diversus | 4 | + | + | + | + | − | + | + |
| Enterobacter aerogenes | 3 | + | + | − | − | + | + | + |
| Yersinia pestis | 3 | + | − | − | − | − | − | − |
| Hafnia alvei | 1 | + | − | − | − | − | − | + |