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Microscope slide of Flavobacterium capsulatum, showing bacterial capsules.
This slide of Flavobacterium capsulatum is stained so that the bacterial capsule appears as a white halo around the bacteria cells.
The bacterial capsule lies outside the cell wall and generally consists of polysaccharide or polypeptide layers. These capsules prevent the bacteria cells from triggering immune system responses and desiccating, heightening the ability of the bacteria to cause disease.