If an organism grows on mannitol salt agar you can conclude that the microbe is a halophile and that it is a Gram-positive bacterium.  

You plate 100 mL of a sample whose dilution is 10-5 that produced 142 colonies. Determine the original cell density of the broth culture.

A clear zone around an antimicrobial disk on a plate being used for a Kirby-Bauer test indicates

A clear zone around an antimicrobial disk on a plate being used for a Kirby-Bauer test indicates

In the blood agar test, the procedure indicated making a throat culture and taping the plates’ edge. Why is tapping the plates’ edge important if all the students are healthy when they take the throat samples?

Determine the type of medium that MSA is and the role of D-Mannitol.  

Consider the image below of the disk diffusion test results of an unknown microbe to answer the questions.   1. Based on what you can observe, select the alternative with the largest zone of inhibition. [option1] 2. Based on what you can observe, select the alternative with the smallest zone of inhibition. [option2] 3. Considering this is an unknown sample, consider if the statement below is true or false.  To report if the microbe is susceptible, intermediate, or resistant, you need the table that shows the zone of inhibition diameters. Once you have the table, you can use the results to guide the appropriate prescribing treatment. [option3]  

You plate 0.1 mL of a sample whose dilution is 10-5 and count 63 colonies after incubation. Determine the original cell density of the broth culture.

You plate 0.1 mL of a sample whose dilution is 10-5 and count 63 colonies after incubation. Determine the original cell density of the broth culture.

Coagulase production can give a pathogenic organism an advantage during infection because it allows the microbe to