TSI Reactions Questions With Complete Solutions

What sugars does triple sugar iron agar contain? correct answer: 1% Lactose 1% Sucrose 0.1% Glucose (Dextrose) What is TSI used for? correct answer: To differentiate enterics based on the ability to reduce sulfur and ferment carbohydrates What is fermented with a red (alkaline) slant and a yellow (acid) deep? (K/A) correct answer: Only glucose What is fermented with a yellow (acid) slant and a yellow (acid) deep? correct answer: Glucose and Lactose and/or Sucrose What is fermented with a red (alkaline) slant and a red (alkaline) deep? correct answer: No carbohydrate fermentation has occured E. coli correct answer: A/A/G Shigella correct answer: K/A Edwardsiella tarda correct answer: K/A/G, H2S Salmonella correct answer: K/A/G, H2S Citrobacter freundii correct answer: A/A/G, H2S K/A/G, H2S Citrobacter koseri correct answer: K/A/G Klebsiella correct answer: A/A/G