| Organism Identified | Microscopic Observation | MacConkey’s Agar | EMB Agar | IMViC | TSI Agar | |||
| Butt | Slant | Gas | H2S | |||||
| E. coli | Gram-ve, Scattered Rods | Pink Colonies | Black with Metallic Shines | + + − − | A | A | + | + |
| Enterobacter Sp. | Gram-ve, Scattered Rods | Pink Colonies | Dark Color Colonies | − − + + | A | A | − | − |
| Klebseilla oxytoca | Gram-ve, Scattered Short Rods | Pink Colonies | Dark Color Colonies | + − + + | A | A | + | − |
| K. pneumoniae | Gram-ve, Scattered Short Rods | Pink Colonies | Dark Color Colonies | − − + + | A | A | + | − |
| Proteus vulgaris | Gram-ve, Scattered Rods | Colorless Colonies | Colorless Colonies | ++ − −/+ | A | A | V | + |
| Citrobacter freundii | Gram-ve, Scattered Rods | Pink Colonies | Dark Color Colonies | − + − + | A/Alk | A | + | + |