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Glossary of Enterobacteriaceae IMViC reaction

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E. coli
+ + - -
Y. enterocolitica
+ + - - (- + - -)
Shigella A, B, C
+ + - - (- + - - )
K. pneumoniae
- - + +
Enterobacter aerogenes
lactose, lysine, ornithine, motile, malonate broth.
Citrobacter freundii
Lactose, methyl red, citrate, urease, motile.
Citrobacter diversus
ornithine, urease, motile, malonate broth
S. marcescens
- - + + (- + - -)
S. rubidaea
- - + +
Salmonella (most serogroups)
- + - +
S. typhi
- + - -
S. sonnnei
- + - -
P. mirabilis
- + + + (- + - -)
P. vulgaris
+ + - -
P. stuartii
+ + - +
P. rettgeri
+ + - +
M. morganii
+ + - -
E. coli positive reactions
Lactose, lysine, ornithine, methyl red, indole, motile.
K. pneumoniae positive reactions
Lactose, lysine, urease, mucoid, NON motile, malonate broth.

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