Morphologies:
- Escherichia coli — large, yellow to salmon color.
- Enterobacter/Klebsiella — large, yellow to salmon color.
- Proteus — variable, blue-green to blue to salmon. Most strains have a black center.
- Salmonella — blue-green to blue color. Most strains have a black center.
- Shigella — green color and moist, raised.
- Pseudomonas — irregular, green to brown color.
- Gram positive bacteria — no growth to partial inhibition.