Why is that the fermentation readings with TSIA and KIA must take place within 18 to 24 hours after incubation from?

Fermentation readings with TSIA and Kia tests must take place within 18 to 24 hours because this is when the results are most accurate. After this time frame, there may be overgrowth of certain bacteria or alterations in the pH of the media that can affect the interpretation of results. Reading the tests within this window ensures reliable and consistent identification of the fermentation patterns of the bacteria being tested.