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Advanced Techniques in Diagnostic Microbiology

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416 P. Francois and J. Schrenzel<br />

A<br />

S.aureus<br />

B<br />

C<br />

D<br />

FIGURE 24.2. Illustrative examples of chromogenic media. (A). ORSAB plates (Oxoid) conta<strong>in</strong><br />

oxacill<strong>in</strong> and a tracer of mannitol fermentation yield<strong>in</strong>g blue Staphylococcus aureus<br />

colonies. (B). Selective ChromAgar plate (ChromAgar), yield<strong>in</strong>g p<strong>in</strong>k Staphylococcus aureus<br />

colonies (pictures are visible on the respective Web sites of the companies). Standard<br />

mannitol–salt agar plate show<strong>in</strong>g colony aspects result<strong>in</strong>g from negative (C) or positive (D)<br />

MRSA cultures. [See Color Plate II]

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