What does a tsi test reveal about proteus mirabilis?

A Triple Sugar Iron (TSI) test reveals important metabolic characteristics of Proteus mirabilis, particularly its ability to ferment sugars and produce gas and hydrogen sulfide (H2S). In a TSI test, Proteus mirabilis typically shows alkaline slant (red) due to no lactose fermentation, and a yellow butt (acidic) indicating glucose fermentation. Additionally, it produces black precipitate due to H2S production, which is a key identifying feature. Overall, the TSI test helps differentiate Proteus mirabilis from other enteric bacteria based on its fermentation and gas production patterns.