Ureaplasma urealyticum classification

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief: Fatimo Biobaku M.B.B.S [2]


Ureaplasma urealyticum was previously classified into biovar 1 and biovar 2 which are now referred to as U. parvum and U. urealyticum respectively.[1]


Tiny (T)-strain Mycoplasma was ascribed to the genus and specie Ureaplasma urealyticum in 1974.[2][1] U. urealyticum was later subdivided into two biotypes consisting of 14 recognized serotypes:[1][3]

  • Biovar 1 or B ( parvo biovar): Ureaplasma urealyticum biovar 1 was later designated as a separate specie called U. parvum following phylogenetic analysis done in 1999. It has four serotypes (serotypes 1, 3, 6, and 14).
  • Biovar 2 or A (T960 biovar): Ureaplasma urealyticum biovar 2 strain (also known as T960 biovar) retained its designation as U. urealyticum, and it consists of the remaining ten serotypes.


  1. 1.0 1.1 1.2 Deguchi T, Yoshida T, Miyazawa T, Yasuda M, Tamaki M, Ishiko H; et al. (2004). "Association of Ureaplasma urealyticum (biovar 2) with nongonococcal urethritis". Sex Transm Dis. 31 (3): 192–5. PMID 15076934.
  2. Shimada Y, Ito S, Mizutani K, Sugawara T, Seike K, Tsuchiya T; et al. (2014). "Bacterial loads of Ureaplasma urealyticum contribute to development of urethritis in men". Int J STD AIDS. 25 (4): 294–8. doi:10.1177/0956462413504556. PMID 24047884.
  3. Robertson JA, Stemke GW, Davis JW, Harasawa R, Thirkell D, Kong F; et al. (2002). "Proposal of Ureaplasma parvum sp. nov. and emended description of Ureaplasma urealyticum (Shepard et al. 1974) Robertson et al. 2001". Int J Syst Evol Microbiol. 52 (Pt 2): 587–97. doi:10.1099/00207713-52-2-587. PMID 11931172.

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