The difference is usually in the exact formulation of the reagent, the
concentration, the carrier of the reagent, the method of inoculation.
Compare the full test in detail in the manuals and spot the difference (I
Riyaz Andrabi wrote:
> In some mannuals it is mentioned that an oxidase reaction is positive
> if black colour develops on the addition of the reagent...in some
> others they say development of blue colour within 15 minutes is a
> positive test.In the same way, for VP test some say pink colour within
> 20 min. and others red color that can take even two hours is a +ve
> test.In case of my organisms some develop red colour in about 2h,some
> become orange and the negative control does not change.I use HiMedia
> reagents and chemicals.Please suggest how should I interpret results.
> Thanks in advance.
>> Riyaz Andrabi
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