Recently a non-starch-fermenting strain of C. ulcerans was isolated and a strain which did not hydrolyse urea when first isolated has also been discovered. For full identification of C. ulcerans both intradermal and subcutaneous tests in guinea-pigs are required, and it is recommended that these tests should be carried out with all organisms which culturally and morphologically resemble diphtheria bacilli.
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Jebb et al. (1965) studied this question.
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