Lab F Gm Neg Rods LDC ODC +

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Lab Final Gram Neg Rods LDC ODC Positive

Pseudomonas aeruginosa

Gram Neg Rod
Aerobe
Motility Positive
Indole Positive
MR Negative
VP Negative
TSI: K/K
Gelatin Positive
Citrate Positive
Nitrate Negative
MacConkey Negative
LDC Positive
ODC Positive
Oxidase Positive

Salmonella typhimurium

Gram Neg Rod
Sulfur Positive
Motility Positive
Indole Negative
MR Positive
VP Negative
TSI: K/A +
XLD: Negative red with black centers
MacConkey Negative
LDC Positive
ODC Positive
PAD Negative
Oxidase Negative

Diff bet Salmonella typhimurium and Pseudomonas aeruginosa

Salmonella typhimurium Sulfur pos
MR Positive when Pseudo is neg
TSI is K/A+ when Pseudo is K/K
Oxidase Neg and Pseudo is Pos
XLD results for Salmonella-neg red with black centers

Citrobacter freundii

Gram Neg rod
Sulfur Positive
Motility Positive
MR Negative
VP Negative
TSI A/A +
Citrate Positive
XLD Positive: yellow with black centers
MacConkey Positive
LDC Positive
ODC Positive
Oxidase Negative

Diff between Citrobacter freundii and Salmonella typhimurium

Diff bet Citrobacter freundii and Salmonella typhimurium:
MR Negative for Citro and MR Pos for Salm
TSI A/A + for Citro and K/A +
MacConkey Pos for Citro and Neg for Salm
XLD-Salm-red with black centers
XLD Citro-Pos yellow with black centers

Diff bet Citrobacter freundii and Pseudomonas aeruginosa

Citro is sulfur pos and Pseudo is not
Citr TSI: A/A + and Pseudo K/K
MacConkey is Pos for Citro and Neg for Pseudo
Oxidase Neg for Citro and Pos for Pseudo

Edwardsiella tarda

Gram neg rod
Sulfur Positive (some)
Indole Positive
MR Positive
VP Negative
TSI K/A +
Citrate Negative
Nitrate Positive
MacConkey Negative
LDC Positive
ODC Positive
Oxidase Negative

Diff bet Edwardsiella tarda and Salmonella typhimurium

all tests are the same except
XLD for Salmonella is neg red with black centers
Edwardsiella tarda is Nitrate and Citrate Pos and Salmonella isn't

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