In the oxidase test, why do you only record results that were positive within th

Question

In the oxidase test, why do you only record results that were positive within the first 15 seconds?

Question 3 options:

All results will eventually be positive due to exposure to air.

Only obligate anaerobes will give an immediate positive result.

Obligate anaerobes will give a positive result over time.

Only obligate aerobes will give an immediate positive result.

All results will eventually be positive due to exposure to air.

Only obligate anaerobes will give an immediate positive result.

Obligate anaerobes will give a positive result over time.

Only obligate aerobes will give an immediate positive result.

Explanation / Answer

3. Ans- Only obligate aerobes will give an immediate positive result

All aerobic bacteria gives positive results in the oxidase test. In this test, the reagent contains a chromogenic reducing agent and it changes the color when oxidized. The result records within 15 seconds because the reagent color changes as time passes and gives a negative result.

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