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The IMViC series of tests provides an identification of the principal groups of Enterobacteriaceae that cause intestinal infections, by using the biochemical properties and their enzymatic reactions to specific substrates

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The IMViC series of tests (Indole production, Methyl red, Voges-Proskauer, Citrate utilization) are commonly used in microbiology to differentiate between Enterobacteriaceae species based on their metabolic pathways. These tests can help identify pathogens, aid in clinical diagnosis, and guide appropriate treatment strategies for infections. The IMViC tests provide valuable information about the biochemical properties and capabilities of bacteria, which are crucial in understanding their pathogenic potential and susceptibility to antimicrobial agents.

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Q: Discuss the medical significance of the IMViC series of tests?
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IMVIC tests for streptococci?

IMViC tests (indole, methyl red, Voges-Proskauer, citrate utilization) are typically used for the identification of enteric bacteria, not for streptococci. Streptococci are usually identified using other methods such as hemolysis patterns, catalase, and Lancefield grouping based on cell wall antigens.


How IMViC tests differentiate Escherichia coli from Enterobacter aerogenes?

IMViC tests differentiate Escherichia coli from Enterobacter aerogenes by examining their biochemical properties. E. coli typically produces a positive result in the Indole and Methyl Red tests, while Enterobacter aerogenes tends to produce a positive result in the Voges-Proskauer and Citrate tests. This differentiation is based on the different metabolic pathways and enzyme activities of the two bacteria.


What is the colony morphology of E. coli on nutrient agar?

I recently completed colony morphology on the E.colispecimen.The results displayed small colonies that were circular in shape, a diameter of approximately 0.5mm, the elevation of the colonies was seen to be slightly raised with the surface incredibly smooth.The colonies were also seen to have a pink colour pigmentation in Mac conkey agar due to its lactose fermenter after growth.The gram stain for these bacteria should be negative rod shaped.


What are the biochemical tests for identification of bacillus subtilis?

Common biochemical tests for identifying Bacillus subtilis include catalase test (positive), gelatin hydrolysis test (positive), starch hydrolysis test (positive), and nitrate reduction test (positive). Additionally, B. subtilis is known to produce the enzyme amylase, which can be detected by starch agar hydrolysis test.


Related questions

What is the IMViC test results for Ecoli?

IMVIC farmula for e.coli is ++--


IMVIC tests for streptococci?

IMViC tests (indole, methyl red, Voges-Proskauer, citrate utilization) are typically used for the identification of enteric bacteria, not for streptococci. Streptococci are usually identified using other methods such as hemolysis patterns, catalase, and Lancefield grouping based on cell wall antigens.


What IMVic results would indicate the presence of fecal coliforms?

The IMViC test results that would indicate the presence of fecal coliforms are negative for indole production, positive for methyl red test, negative for Voges-Proskauer test, and positive for citrate utilization.


What are the IMViC and TSI results for Proteus vulgaris?

IMViC results for Proteus vulgaris are typically indole negative, methyl red positive, Voges-Proskauer negative, and citrate positive. TSI results for Proteus vulgaris show alkaline/alkaline (red/red) slant/butt with no gas production and no hydrogen sulfide production.


What are results of Imvic test on staphylococci?

Staphylococcus epidermidis indole test - negative methyl red - negative voges proskauer test - positive citrate test - no idea


What are the results of Imvic test on salmonella typhi?

Indole - NegativeMethyl Red - PositiveVouges Proskauer - NegativeCitrate-NegativeTSI - Alkaline slant/Acid butt with H2SSIM - Motile, H2S positiveUrease - Negative


Why is the IMViC useful in identifying enterobacteriaceae?

The IMViC test (Indole, Methyl Red, Voges-Proskauer, Citrate) is useful in identifying Enterobacteriaceae because it helps differentiate between different members within this bacterial family based on their biochemical characteristics. Each test targets a specific metabolic pathway that can be used to distinguish between different genera or species of Enterobacteriaceae. This information can aid in the accurate identification of a particular strain and help determine its pathogenic potential.


What reagents do you add for each of the imvic test?

For the Indole test, you add Kovac's reagent. For the Methyl Red test, you add Methyl Red indicator. For the Voges-Proskauer test, you add alpha-naphthol and potassium hydroxide. And for the Citrate test, you add Simmons citrate agar.


How can you be certain that growth with a green metallic sheen is truly a coliform bacterium?

To confirm that growth with a green metallic sheen is a coliform bacterium, you would need to perform additional tests such as Gram staining, biochemical tests like the IMViC series (Indole, Methyl Red, Voges-Proskauer, Citrate), and possibly molecular techniques like PCR for specific coliform species. This comprehensive approach is necessary as the green metallic sheen is a characteristic of some coliform bacteria but is not exclusive to them.


How IMViC tests differentiate Escherichia coli from Enterobacter aerogenes?

IMViC tests differentiate Escherichia coli from Enterobacter aerogenes by examining their biochemical properties. E. coli typically produces a positive result in the Indole and Methyl Red tests, while Enterobacter aerogenes tends to produce a positive result in the Voges-Proskauer and Citrate tests. This differentiation is based on the different metabolic pathways and enzyme activities of the two bacteria.


Biochemical test used in identification of salmonella typhi?

The biochemical test commonly used to identify Salmonella typhi is the Widal test. This test detects antibodies produced in response to a Salmonella typhi infection by measuring agglutination (clumping) reactions between the bacteria and specific antibodies in the patient's serum. Other tests like blood culture and polymerase chain reaction (PCR) can also be used for confirmation.


Two gram negative bacilli that produce swarming colonies What biochemical tests would you use to identify the bacilli?

To identify the bacilli, biochemical tests such as oxidase test, catalase test, IMViC tests (Indole, Methyl Red, Voges-Proskauer, Citrate), and sugar fermentation tests can be used. These tests can help differentiate between different species and provide valuable information about the metabolic capabilities of the bacteria.