Which bacteria is positive for indole test?

Which bacteria is positive for indole test?

Indole-Positive Bacteria

Bacteria that test positive for cleaving indole from tryptophan include: Aeromonas hydrophila, Aeromonas punctata, Bacillus alvei, Edwardsiella sp., Escherichia coli, Flavobacterium sp., Haemophilus influenzae, Klebsiella oxytoca, Proteus sp. (not P. mirabilis and P.

Do Gram-positive bacteria produce indole?

Indole is widespread in the natural environment. By far, at least 85 bacterial species have been shown to produce large quantities of this molecule, including both Gram-positive and Gram-negative bacteria of which many are pathogens [3].

What does positive indole test mean?

The presence of indole when a microbe is grown in a medium rich in tryptophan demonstrates that an organism has the capacity to degrade tryptophan.

Is E. coli indole positive or negative?

indole positive
Indole production is often used to differentiate E. coli from other indole-negative enteric bacteria because 96% of E coli are indole positive, whereas many enterobacterial species are negative in the indole reaction.

Is Staphylococcus aureus indole positive?

aureus isolates, 17 (85%) were found as positive for coagulase, catalase, methylene red, Voges-proskauer and hemolysis tests and negative for oxidase and indole tests. They also produce acid from glucose, lactose and sucrose.

Is Klebsiella indole test positive?

Klebsiellae are an important cause of nosocomial infections. The two clinically relevant species, Klebsiella pneumoniae and Klebsiella oxytoca, are differentiated by the ability to produce indole from tryptophan, K. oxytoca being indole positive.

Is Staphylococcus aureus indole-positive?

What bacteria can produce indole?

many pathogenic bacteria such as Bacillus alvei, pathogenic E. coli, several Shigella strains, Enterococcus faecalis, and V. cholerae, can produce indole.

Is Salmonella indole positive?

Salmonellae yield negative Voges-Proskauer and positive methyl red tests and do not produce cytochrome oxide. Salmonellae are also unable to deaminate tryptophan or phenylalanine and are usually urease and indole negative.

Is Staphylococcus aureus indole negative?

How can you differentiate between Staphylococcus aureus and Staphylococcus epidermidis?

The key difference between epidermidis and aureus is that Staphylococcus epidermidis is a non-haemolytic bacterium while Staphylococcus aureus is a haemolytic bacterium. Epidermidis and aureus are species names of two bacteria in the bacterial genus Staphylococcus.

Is Pseudomonas indole positive?

Pseudomonas gives negative Voges Proskauer, indole and methyl red tests, but a positive catalase test.

Is Streptococcus pneumoniae indole positive or negative?

BIOCHEMICAL TESTS FOR STREPTOCOCCUS PNEUMONIAE

Is Pseudomonas aeruginosa indole positive or negative?

Biochemical Test and Identification of Pseudomonas aeruginosa

Is Klebsiella indole positive?

1) Klebsiella species: Klebs‪iella oxytoca is indole positive whereas Klebsiella pneumoniae is indole negative.

Is S. aureus indole positive?

In the Gram-positive Staphylococcus aureus, indole decreased production of the virulence factor staphyloxanthin,33 which confers enhanced oxidant and neutrophil resistance to the bacterium, and has been shown to contribute to virulence in vivo.

What tests are used to identify Staphylococcus epidermidis?

Coagulase testing is the single most reliable method for identifying Staphylococcus aureus [9]. Coagulase production can be detected using either the slide coagulase test (SCT) or the tube coagulase test (TCT).

Which test is used to differentiate Staphylococcus aureus from Staphylococcus epidermidis?

Differentiation of Staphylococcus aureus and Staphylococcus epidermidis by PCR for the fibrinogen binding protein gene.

Is Streptococcus citrate positive or negative?

Streptococcus organisms are Gram positive, microaerophilic and non-motile bacteria.

Which test is specific for Streptococcus pneumoniae?

pneumoniae can be identified using Gram stain, catalase, and optochin tests simultaneously, with bile solubility as a confirmatory test. If these tests indicate that the isolate is S. pneumoniae, serological tests to identify the serotype can be performed.

Is Enterobacter aerogenes indole positive?

E. coli is indole-positive; Enterobacter aerogenes is indole- negative.

Is Pseudomonas indole-positive?

Is Salmonella indole-positive?

Is Staphylococcus Saprophyticus indole positive or negative?

Excerpt. Staphylococcus saprophyticus is a Gram-positive, coagulase-negative, non-hemolytic coccus that is a common cause of uncomplicated urinary tract infections (UTIs), particularly in young sexually active females.

How can you distinguish between Staphylococcus aureus and Staphylococcus epidermidis?

Staphylococcus aureus forms a fairly large yellow colony on rich medium; S. epidermidis has a relatively small white colony. S. aureus is often hemolytic on blood agar; S.