Staphylococcus aureus is a Gram-positive, round-shaped bacterium that is a member of the Firmicutes, and it is a usual member of the microbiota of the body, frequently found in the upper respiratory tract and on the skin.It is often positive for catalase and nitrate reduction and is a facultative anaerobe that can grow without the need for oxygen. Cultural characteristics of Staphylococcus aureus Staphylococci grow readily on most bacteriologic media under aerobic or microaerophilic conditions. Colonies on solid media are round, smooth, raised, and glistening. Thirty percent (30%) of the normal human healthy population is affected by S. aureus as it asymptomatically colonizes on the skin of human host. Staphylococcus aureus on Tryptic Soy Agar.

Cultivation 24 hours at 37°C.

Yellow colonies of Staphylococcus aureus on TSA. Morphology Gram positive, singly, in pairs or in short chain of 3-4 bacteria. Staphylococcus aureus.

The morphology of Staphylococcus aureus – the shape of the bacteria – if shown under a microscope shows purple clusters of round bacteria. Staphylococcus aureus on Columbia agar with 5% defibrinated sheep blood (Bio-Rad™). The purple color is not a natural phenomenon but the result of a Gram-stain that colors the thick peptidoglycan membrane of … S.aureus colony description:. Morphology: Gram-positive, cocci, 0.5-1.5µm in diameter; occur characteristically in group, also singly and in pairs Form irregular grapelike clusters (since divide in 3 planes)


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