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Deoxyribonucleic acid relatedness studies (S1 nuclease method) showed that 25 strains of Haemophilus ducreyi from diverse geographic origins form a homogeneous deoxyribonucleic acid hybridization group. A total of 17 type or reference strains of established or proposed Haemophilus species were 0 to 6% related to H. ducreyi at the optimal temperature. These findings do not support the assignment of H. ducreyi to the genus Haemophilus.
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Casin et al. (1985) studied this question.
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