What bacteria is this most likely to be based on these test results? - possible

Question

What bacteria is this most likely to be based on these test results?

- possible capsule

-possibly cocci or rod shaped

-gram negative

-ferments glucose, lactose, and mannitol and produces gas as an end product

-indole - negative

- MR/VP negative/ negative

- Citrate - Possitve

- Triple sugar iron - gulcose fermentation acid production aerobic catalazation of protien

- starch, caesin, and gelatin hydrolysis are all negative

- catalase - positive

- Oxidase - Negative

- Nitrate reduction - Positive - reduces nitrate to nitrite

- Urease - Negative

- Phylalanine Deamase - Negative

- Lipase - Negative

- DNase - positive

- Mannitol salt agar - Negative

- MacConkey Agar - pink growth indicating Acid production from lactose fermentation - possible Coliform

- EMB Agar - good growth - Possible coliform

Thank you for your time.

Explanation / Answer

Gram negative rod with catalase positive, good growth on EMB agar and pink color colonies formed on MacConkey gar indicate the organism is Enterobacteriaceae member. Glucose, lactose and mannitol fermentation is positive with gas production, Citrate and Nitrate tests are positive, Urease and oxidase tests are negative and thus the gram negative bacterium could be Enterobacter aerogenes.

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