Notes: Priority of Providencia rustigianii Hickman-Brenner, Farmer, Steigerwalt, and Brenner 1983 Over Providencia friedericiana Müller 1983 Hickman-Brenner, F. W. and Fanning, G. R. and Müller, H. E. and Brenner, Don J.,, 36, 565-566 (1986), doi = https://doi.org/10.1099/00207713-36-4-565, publicationName = Microbiology Society, issn = 1466-5026, abstract= 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. , language=, type=