Negative Oxidase Test

Oxidase negative

Touch the Gibson Oxidase Test swab to a colony. An oxidase-positive reactions will appear purple to black within 10 seconds as shown in the above image. No change in color is negative. Disregard any color development that appears after 60 seconds.

Creative Commons License
Microbiology Laboratory Manual by Gary E. Kaiser, PhD, Professor of Microbiology
is licensed under a Creative Commons Attribution 4.0 International License.
Last updated: September, 2017