• A genus of gram-negative, mostly facultatively anaerobic bacteria in the family MYCOPLASMATACEAE. The cells are bounded by a PLASMA MEMBRANE and lack a true CELL WALL. Its organisms are pathogens found on the MUCOUS MEMBRANES of humans, ANIMALS, and BIRDS.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025
• A genus of nonmotile facultatively anaerobic bacteria that lack a true cell wall, are gram-negative, and require sterol for growth.
  NCI
  U.S. National Cancer Institute, 2021
• Any bacteria that is not assigned to the species level but can be assigned to the Mycoplasma genus level.
  CDISC Terminology
  Clinical Data Interchange Standards Consortium (CDISC), 2021
• Genus of gram negative, mostly facultatively anaerobic bacteria in the family Mycoplasmataceae; the cells are bounded by a plasma membrane and lack a true cell wall; its organisms are pathogens found on the mucous membranes of humans, animals, and birds.
  CRISP Thesaurus
  National Institutes of Health, 2006
• Mycoplasmas are bacteria that cause infections in the respiratory tract and the urinary and genital tracts. Mycoplasmas are different from other bacteria because they do not have cell walls. Many antibiotics, such as penicillin, kill bacteria by weakening cell walls. Because Mycoplasmas do not have cell walls, many antibiotics cannot...
  Merck Manuals
  Merck & Co., Inc., 2025