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India ink capsule stain

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Definition

noun

(microbiology) A negative staining technique wherein the presence of unstained capsule renders a 'halo' appearance surrounding the purple-stained cells


Supplement

India ink capsule stain is used to demonstrate cell capsules through microscopic examination. This procedure is used to detect presence of encapsualted species, e.g. Cryptococcus neoformans, which causes cryptococcosis in humans.