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Macconkey Information and Courses from MediaLab, Inc.

These are the MediaLab courses that cover Macconkey and links to relevant pages within the course.

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Laboratories Individuals

CLIA Microbiology / Serology Review
Which of the following media contains the X and V factors necessary for the growth of Haemophilus influenzae:View Page
Match the differential/ selective enteric medium with its characteristic indicator, fermentable, and bacteriostatic.View Page
Which of the following media is commonly used when performing the Kirby-Bauer disk diffusionView Page
MacConkey agar contains all of the following except :View Page
Match the culture media on the right with possible organism on the left:View Page
The red/pink color of the colonies (E. coli) seen on this MacConkey Agar Plate is an indication of:View Page

Current Topics in Clinical Microbiology
The colonies shown in the blood agar (upper) and MacConkey agar (lower) biplate are a 24 hour growth from an aerobic blood culture bottle that became positive at 12 hours after inoculation. The appearance of the colonies on MacConkey agar rules out the following two bacterial species:View Page
Colony Morphology

Photograph of the surface of blood agar after 24 hours incubation at 35C in 10% CO2, on which are growing tiny, translucent, gray colonies surrounded by a narrow zone of "soft" beta hemolysis.There was no growth on the MacConkey plate.

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Eikenella BAP

Photograph of the surface of a 5% sheep blood agar plate after 48 hours incubation at 35 degrees C in 10% CO2.The colonies shown are small, flat, entire, dull gray, and show superficial pitting of the agar (see yellow arrows).A slight discoloration of the agar surrounding the colonies is seen.A bleach-like odor is detected.Similar growth was seen on a chocolate agar plate set up in parallel.Growth was not observed on the MacConkey plate.

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