Microbiology Lab Tests: Fermentation, Oxidation, and DNase Test

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What is the main purpose of the 'E' test mentioned in the text?

To quantify the number of bacteria in a sample

To assess the motility of bacteria

To identify the species of bacteria present in a sample

To determine the susceptibility of bacteria to antibiotics (correct)

What does a positive result in the 'E' test indicate?

Resistance to erythromycin

Increased motility of bacteria

Ellipse of growth inhibition (correct)

Appearance of a 'D pattern'

What is the main difference between BACTERIAL IDENTIFICATION CONVENTIONAL and ANALYTICAL methods mentioned in the text?

The presence of manual biochemical tests

The use of selective medium

The focus on motility and staining

The use of plastic strips and microtubes with biochemical substrates (correct)

What is the purpose of PEA (Phenyl Ethyl Alcohol) agar?

To identify gram positive cocci and other anaerobic gram negative rods Signup and view all the answers

In the thioglycollate enrichment broth, where does the growth typically occur for strict aerobes?

Towards the surface Signup and view all the answers

What is the purpose of the dilution method in susceptibility testing?

To determine minimum inhibitory concentration (MIC) Signup and view all the answers

What does MIC stand for in the context of susceptibility testing?

Minimum Inhibitory Concentration Signup and view all the answers

What is the purpose of the tube dilution method in susceptibility testing?

To determine minimum bactericidal concentration (MBC) Signup and view all the answers

In which method is serial dilution of antibiotics prepared on petri dishes?

Agar dilution method Signup and view all the answers

What is the purpose of the DNASE TEST/THERMONUCLEASE (+) test?

To detect the presence of deoxyribonuclease in an organism Signup and view all the answers

What is the result of a positive DNASE TEST/THERMONUCLEASE (+) test using methyl green dye?

Clear zone around the colonies Signup and view all the answers

Which of the following is a test for the identification of an organism?

VP and Nitrate (+) Signup and view all the answers

What is the definitive test for S. aureus?

COAGULASE (+) Signup and view all the answers

What is the result of a positive CEPHALOSPORINASE TEST using a Cefinase disk?

Pink to Red (change in color) within 60 minutes Signup and view all the answers

What are organisms sensitive to, according to the text?

Lysostaphin Signup and view all the answers

Microbiology Lab Tests: Fermentation, Oxidation, and DNase Test

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