Cultural characterisitcs

Morphology

Gram staining

Glucose

indole

Coagulate

Catalase

Citrate

Most probable identity

Yellowish orange and slimy

Cocci in pairs

+

+

−

−

+

+

S. aureus

Red-coloured with a smooth serrated edge

Rods straight

−

+

+

+

+

+

Escherichia coli

Creamy and irregular

Rods scattered

+

−

−

−

+

−

Salmonella

enteritidis