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.
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