Sources | Isolates | Gram reaction | Morphology under the microscope | Morphology on the plates |
1) Cow dung | E. coli | Gram-negative | Rod-like | Metallic sheen on Eosin Methylene Blue (EMB) |
2) Human nose swab | S. aureus | Gram-positive | Cocci in clusters | Yellow colonies on Mannitol |
3) Soil | Shigella sp. | Gram-negative | Rod-like, non-sporing | Pink colors on MacConkey |
4) Soil | Salmonella sp. | Gram-negative | Rod-like, non-capsulate | Dark colors on SSA |
5) Soil | Bacillus sp. | Gram-positive | Rod-like | Rough, slightly yellow and opaque on nutrient agar |
6) Soil | P. aeruginosa | Gram-negative | Rod-like | Greenish-blue in Nutrient agar |
7) Stream water | Strept. sp. | Gram-positive | Cocci in chains | Milky in nutrient agar |