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The page below is a sample from the LabCE course Preliminary Identification of the Primary Select Agents of Bioterrorism. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Gram stains are performed on positive blood culture bottles. Match the organism that MOST closely resembles the description of the Gram stain morphology provided.

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

Large, gram-positive rods with square ends in short chains
Gram-negative rod resembling Enterobacteriaceae, demonstrates bipolar staining
Very tiny, pale staining, gram-negative coccobacillus; often difficult to see individual cells
Small, gram-negative coccobacilli that appear gram-positive due to retention of crystal violet stain; individual cells present