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The page below is a sample from the LabCE course Reading Gram Stained Smears From Cultures. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Match the Gram stain characteristic to the organism it BEST describes.

Select the correct match for each item from the drop-down box

Branching, long, thin filamentous gram-positive rods; tend to stain with a beaded, gram-variable pattern
Gram-negative diplococci with adjacent sides flattened (coffee bean shaped)
Gram-positive cocci in clusters and tetrads
Small, palisading gram-positive rods demonstrating a picket-fence arrangement