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https://asm.org/getattachment/200d3f34-c75e-4072-a7e6-df912c792f62/indole-test-protocol-3202.pdf#:~:text=To%20test%20for%20indole%20production%2C%20inoculate%20a%204-ml,the%20reagent%20stays%20yellow%2C%20the%20test%20is%20negative.
https://hoursfinder.com/t-hours/test-indole-48-hours.html
culture. Incubate at 35°C (+/- 2°C) for 24 to 48 hours. To test for indole production, add 5 drops of Kovács reagent direct ly to the tube (3, 5). A positive indole test is indicated by the formation of a pink to red color ("cherry-red ring") in the reagent layer on top of the medium within seconds of …
https://microbiologie-clinique.com/indole-test-en.html
Inoculate the tryptophan (or peptone) broth with the organism to be tested and incubate at 37 ° C for 24 to 48 hours. Add 0.5 ml (5 drops) of Kovác's reagent and …
https://asm.org/getattachment/200d3f34-c75e-4072-a7e6-df912c792f62/indole-test-protocol-3202.pdf
culture. Incubate at 35°C (+/- 2°C) for 24 to 48 hours. To test for indole production, add 5 drops of Kovács reagent direct ly to the tube (3, 5). A positive indole test is indicated by the formation of a pink to red color ("cherry-red ring") in the reagent layer on top of the medium within seconds of …
https://www.carolina.com/teacher-resources/Interactive/bacterial-the-indole-test/tr32906.tr
Procedures. Bacteria must be incubated for 24–48 hours between the initial inoculation and the addition of Kovac’s reagent. If you are not using pre-poured media tubes, you will need to prepare tubes the day before the lab. Students can work singly or in pairs.
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