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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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Tetrad Cell Arrangement

Examples of gram-positive bacteria, many appearing as tetrads (groups of four), are noted in this slide. Sometimes bacteria in tetrad arrangement may not be as clear cut, but may appear as clusters. Neisseria gonorrhea colonies may appear as gram-negative tetrads, especially if the smear is made from very young colonies.