Analysis of the 16S rRNA gene of microorganism WSU 86-1044 from an aborted bovine foetus reveals that it is a member of the order Chlamydiales: proposal of Waddliaceae fam. nov., Waddlia chondrophila gen. nov., sp. nov. Rurangirwa, Fred R. and Dilbeck, Pamela M. and Crawford, Timothy B. and McGuire, Travis C. and McElwain, Terry F.,, 49, 577-581 (1999), doi = https://doi.org/10.1099/00207713-49-2-577, publicationName = Microbiology Society, issn = 1466-5026, abstract= The structural gene encoding the 16S rRNA of the new obligate intracellular organism presently designated WSU 86-1044T was sequenced and analysed to establish its phylogenetic relationships. The 16S rDNA sequence was most closely related to those of chlamydial species, having 84·7–85·3 % sequence similarity, while it had 72·4–73·2% similarity with rickettsia-like organisms. When the sequences of the four species of chlamydiae (Chlamydophila psittaci, Chlamydia trachomatis, Chlamydophila pneumoniae and Chlamydophila pecorum) were compared, they had > 93% sequence similarity indicating that WSU 86-1044T was not close enough to be in the same family as current Chlamydiaceae members. However, based on the 84·7–85·3% 16S rDNA sequence similarity of WSU 86-1044T and other previously described characteristics, WSU 86-1044T belongs to a novel family within the order Chlamydiales; hence, the proposal of Waddliaceae fam. nov., Waddlia chondrophila gen. nov., sp. nov., language=, type=