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Scientific classification
Kingdom: Bacteria
Phylum: Tenericutes
Class: Mollicutes
Order: Mycoplasmatales
Family: Mycoplasmataceae
Freundt 1955

Candidatus Hepatoplasma

Mycoplasmataceae is a family of bacteria [1] in the order Mycoplasmatales. This family consists of the genera Mycoplasma and Ureaplasma.

In 1967, the order Mycoplasmatales was incorporated into the class Mollicutes.[2] Many species are sexually transmitted and cause pelvic inflammatory disease.[3]



Mycoplasma refers to a genus of bacteria that lack a cell wall and possess a three-layered cellular membrane.[4] They can be parasitic or saprotrophic. Several species are sexually transmitted and pathogenic in humans. Others are found on cats, dogs, and barnyard fowl.


Ureaplasma is the second of two genera of bacteria belonging to the family Mycoplasmataceae. As the name implies, ureaplasma is urease positive.

It includes the species:

Ureaplasma parvum has been identified as being a commensal in the uterus as part of the microbiome in healthy women of reproductive age.[5][6]


  1. ^ E.A. Freundt The classification of the pleuropneumonia group of organisms (Borrelomycetales) International Bulletin of Bacteriological Nomenclature and Taxonomy, 1955, 5, 67-78.] (See page 73)
  2. ^ Edward, D.G.; Freundt, E.A. (1967). "Proposal for Mollicutes as name of the class established for the order Mycoplasmatales" (PDF). Int J Syst Bacteriol. 17: 269–272. doi:10.1099/00207713-17-3-267. 
  3. ^ Ljubin-Sternak, Suncanica; Mestrovic, Tomislav (2014). "Review: Chlamydia trachomatis and Genital Mycoplasmiasis: Pathogens with an Impact on Human Reproductive Health". Journal of Pathogens. 2014 (183167). doi:10.1155/2014/183167. PMC 4295611Freely accessible. PMID 25614838. 
  4. ^ Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. pp. 409–12. ISBN 0-8385-8529-9. 
  5. ^ Yarbrough, V. L.; Winkle, S.; Herbst-Kralovetz, M. M. (2014). "Antimicrobial peptides in the female reproductive tract: a critical component of the mucosal immune barrier with physiological and clinical implications". Human Reproduction Update. 21 (3): 353–377. doi:10.1093/humupd/dmu065. ISSN 1355-4786. PMID 25547201. 
  6. ^ Mor, Gil; Kwon, Ja-Young (2015). "Trophoblast-microbiome interaction: a new paradigm on immune regulation". American Journal of Obstetrics and Gynecology. 213 (4): S131–S137. doi:10.1016/j.ajog.2015.06.039. ISSN 0002-9378. PMID 26428492. 

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