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Deoxyribonucleic acid hybridization studies done on 24 Providencia friedericiana strains showed that they were highly related (74 to 86% at 75°C) to the type strain of Providencia rustigianii. In addition, their biochemical reactions were the same. Therefore, the names P. rustigianii and P. friedericiana are subjective synonyms. Because P. rustigianii was described and validated first, it is the senior synonym and has priority over the junior synonym, P. friedericiana.
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Hickman-Brenner et al. (1986) studied this question.
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