Gram-Negative Rods (GNRs)

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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.

Learn more about Reading Gram-stained Smears From Cultures (online CE course)
Gram-Negative Rods (GNRs)

Examples of pink to red staining gram-negative bacteria demonstrating the bacilli or "rod" shape are shown in the images on this page.

Escherichia coli smear made from culture
Pseudomonas aeruginosa smear made from culture