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*Small essentially spherical micro-organisms. | *Small essentially spherical micro-organisms. | ||
**Each micro-organism 1.8-3 micrometres - purple on [[H&E stain]]. | **Each micro-organism 1.8-3 micrometres - purple on [[H&E stain]]. | ||
**Arranged in clusters of 4, 8 or more - classically in a tetrad. | **Arranged in clusters of 4, 8 or more - classically in a tetrad - '''key feature'''. | ||
DDx: | |||
*Micrococcus - form larger clusters.<ref name=pmid21997690/> | |||
===Images=== | ===Images=== |
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