Enterobacteriaceae (just bacteria)

Question 1

What are the defining tests for E. coli?

Answer 1

Lactose fermenter, oxidase negative, catalase positive, indole positive, citrase negative, and H2S negative.

Question 2

What are the defining tests for Citrobacter?

Answer 2

Lactose fermenter, indole negative, urease postitive, H2S+

Question 3

What are the defining tests for Klebsiella?

Answer 3

Lactose fermenter, indole negative, urease positive, H2S negative.

Question 4

What are the defining tests for Proteus?

Answer 4

Non-lactose fermenter, motile, indole negative, urease positive, H2S positive, VP negative.

Question 5

What are the defining tests for Serratia marcesens?

Answer 5

Non-lactose fermenter, motile, urease negative, H2S negative, methyl red negative, VP positive, citrase positive.

Question 6

What are the defining tests for Enterobacter?

Answer 6

Lactose fermenter, H2S negative, urease negative, indole negative, VP positive, citrase positive.

Question 7

What are the defining tests for Salmonella?

Answer 7

Non-lactose fermenter, motile, urease negative, H2S positive.

Question 8

What is the mnemonic for the urease positive enterobacteriaceae?

Answer 8

California Pizza Kitchen (Citrobacter, Proteus, and Klebsiella). CItrobacter and Klebsiella can be distinguished by Klebsiella being H2S negative and Citrobacter being H2S positive.