IMViC Reactions

Question 1

E. coli (and also Edwardsiella trada) IMViC rxn?

Answer 1

++- -

Question 2

Shigella serogroups A, B, and C IMViC rxn? What’s different about S. sonnei?

Answer 2

V+- -

S. sonnei is -+- -

Question 3

Salmonella spp/ IMViC rxn?

Answer 3

-+-+

Question 4

Citrobacter freundii IMViC rxn?

Answer 4

-+-+

Question 5

Klebsiella pneumoniae IMViC rxn?

Answer 5

neg neg pos pos
(the opposite of E. coli)

Question 6

Enterobacter cloacae and aerogenes

Answer 6

-,-,+,+

Question 7

S. marcescens IMViC rxn?

Answer 7

-,-,+,+

Question 8

Proteus mirabilis IMViC rxn?

Answer 8

-+VV

Question 9

Proteus vulgaris IMViC rxn?

Answer 9

++-V

Question 10

How to tell Providencia spp and Morganella morganii apart on the IMViC rxn?

Answer 10

both are indole pos, MR pos, and VP neg, but
- Providencia spp is citrate POS
- Morganella morganii is citrate NEG

Question 11

Yersinia enterocolitica IMViC rxn?

Answer 11

V+- -
(like shigella)

Question 12

What are the only VP positive bacteria (in this set?)

Hint: think about what bacteria are -,-,+,+

Answer 12

Klebsiella
Enterobacter spp.
- cloacae
- aerogenes
S. marcescens

Question 13

What three bacteria do NOT exhibit motility?

Answer 13

Shigella, Klebsiella, Yersinia enterocolitica

(Y. enterocolitica is not motile at 35ºC, but is at 22ºC)