Free coagulase : converts fibrinogen directly to fibrin without requiring a coagulase reacting factor

Indole production is detected by ______ reagent which contains 4 (p)-dimethylamino-benzaldehyde

In oxidase test , reagent will be oxidized to

Urease test , one of the following is false

This test detect the formation of a neutral
product (acetyl methyl carbinol) during fermentation of glucose. This can be detected by the addition of Barritt's reagent after incubation. The development of a red color is considered a positive result.

TSI test : This reaction is for lactose fermenting bacteria, which ferment the lactose that present in large amounts in the medium(1 %)

TSI test
Bubbles or break in the medium : due to the formation of gas.

All the following are characteristics of Enterobacteriaceae except

The green metallic sheen indicates _______ is able to ferment lactose to produce strong acid end-products.

Escherichia coli :
Microscopical appearance: Gram-positive
short rods. Most strains are motile

INDOLE test , one of the following is true

Enterobacter aerogenes : negative methyl red test

_______ is the reagent in VOGES –PROSKAUER test

Regarding to KLEBSIELLA one of the following is false

Regarding to ENTEROBACTER , one of the following is false

SERRATIA MARCESCENS

CITROBACTER : Can cause UTI & bacteremia. G-ve short rods, motile & late lactose fermenters on MacConky agar.

Growth on MacConkey agar: Non-lactose fermenter (colonies are pale colorless)

SALMONELLA , one of the following is false