Analysis of the 16S rRNA gene of micro-organism 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

Int J Syst Bacteriol. 1999 Apr;49 Pt 2:577-81. doi: 10.1099/00207713-49-2-577.


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.

MeSH terms

  • Abortion, Veterinary / microbiology*
  • Animals
  • Cattle
  • Cattle Diseases / microbiology*
  • Chlamydiales / classification*
  • Chlamydiales / cytology
  • Chlamydiales / genetics
  • Chlamydiales / isolation & purification
  • DNA, Bacterial / chemistry
  • DNA, Bacterial / genetics
  • DNA, Ribosomal / chemistry
  • DNA, Ribosomal / genetics
  • Female
  • Fetus / microbiology*
  • Genes, rRNA*
  • Molecular Sequence Data
  • Phylogeny
  • Polymerase Chain Reaction / methods
  • Pregnancy
  • RNA, Ribosomal, 16S / genetics
  • Sequence Analysis, DNA


  • DNA, Bacterial
  • DNA, Ribosomal
  • RNA, Ribosomal, 16S

Associated data

  • GENBANK/AF042496