Sample Question from Current Topics in Clinical Microbiology, presented by MediaLab

Neonatal meningitis: Laboratory Identification

Listeria gram stain

Photomicrograph of a gram stain prepared from an 18 hour old broth culture.
The organism is a small, non-spore-forming bacillus measuring between 0.4 to 0.5um by 1.0 to 3.5um.
Coccobacillary forms, diplobacilli, and bacilli in short chains or in diphtheroidal clusters (upper right in photograph) may all be observed in gram stain preparations.
When found in the CSF, the organism may be found both intracellularly and extracellulary.

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