Please help me identify my unknown bacterium, here is a list of the possible bac

Question

Please help me identify my unknown bacterium, here is a list of the possible bacterium’s. Below, you may also view a list of my test results.

Citrobacter fruendii, Salmonella typhimurium, Enterobacter aerogenes, Alicaligenes faecalis, Klebsiella pnemoneae, Pseudomonas aeruginosa, Proteus Vulgaris, Bacillus cereus, E. Coli

Gram (-), bacilli

Lactose Fermentation, (-)

EMB, (+) growth, light color, ivory/pink

MAC, (+) growth, colorless ivory

IMVIC

Índole: (+), pink

MR: (+), Cherry Red

VP: (-)

Citrate: (-), Green

Nitrate Reductase: (+), Red

Explanation / Answer

According to the test results, the unknown bacterium is Proteus vulgaris.

It is Gram negative bacilli, non lactose fermenter

EMB positive growth with light colour colony

MAC positive growth, colourless colony

IMViC: ++--

Nitrate reductase: positive

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