Abstract
After 2 days of growth on Brain heart infusion agar (BHIA) at 38 degrees C, phase-I colonies and degraded-phase colonies of Bordetella bronchiseptica could be differentiated by their ability to take up crystal violet (CV). Phase-I colonies in X mode, but not colonies in degraded phases (phases II, III, and rough) bound CV. Phenotypically-altered C-mode colonies (grown at 32 degrees C or lower temperatures) also lacked this ability. CV staining offers an easy method for the recognition of different colony types that appear identical when observed on BHIA.
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