Mycoplasma

Mycoplasma is a genus of wall-less bacteria in the class Mollicutes, characterized by the smallest genomes of any self-replicating organisms (~580–1,350 kb). The lack of a cell wall makes them intrinsically resistant to beta-lactam antibiotics and undetectable by Gram staining. Key human-pathogenic species include M. pneumoniae (atypical pneumonia), M. genitalium (STI), and M. hominis (urogenital infections).

Like ureaplasma (a fellow Mollicute), Mycoplasma species are parasitic, depending on host cells for nutrients they cannot synthesize — including cholesterol for membrane stability.

Reproductive Tract Associations

Gut and Systemic Associations

Cross-References

  • ureaplasma — sister Mollicute genus; shares wall-less biology and urogenital niche
  • endometriosis — vaginal microbiome associations
  • propionic acid — some Mycoplasma species produce propionate