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Updated: Sep 10, 2026

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Laboratory Techniques Used to Maintain and Differentiate Biotypes of Vibrio cholerae Clinical and Environmental Isolates
Published on: May 30, 2017
Methods for the routine characterisation of isolates of Haemophilus
Journal of Clinical Pathology
|September 1, 1982
Abstract:
Methods and their evaluation are described for the routine characterisation of Haemophilus spp isolates using a test for dependence on V factor and a test for the conversion of delta-amino-laevulinic acid (ALA) to porphyrin in which the ALA is incorporated into a solid medium. A method is also described whereby the difference in the size of the inhibition zones around discs of ampicillin and of amoxycillin/clavulanate can be used to detect the production of beta-lactamase.
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