Biology Forums - Study Force

A dark pigmented colony is isolated from the leg wound of a fisherman from Florida. The gram-negative rod grows on sheep blood and MacConkey agars. The organism provides the following reactions:
               TSI: K/A                       Indole: no color change        Lysine: no color change
               1% NaCL: no growth      Arginine: purple                 Ornithine: no color change
               DNase: pink halo around the area of organism inoculum      
               The microbiologist cannot read the oxidase reaction due to the dark pigment. What can he do to help achieve a valid oxidase reaction?
               a.  Perform a modified oxidase test
               b.  Grow the organism under anaerobic conditions and retest
               c.  The oxidase test is not necessary for the identification of this organism
               d.  Grow the organism on a non-nutrient agar and retest

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This works! Perfect

Thanks for the feedback :)