Thayer–Martin agar (or Thayer–Martin medium, or VPN agar) is a Mueller–Hinton agar with 5% chocolate sheep blood and antibiotics. It is used for culturing and primarily isolating pathogenic Neisseriabacteria, including Neisseria gonorrhoeae and Neisseria meningitidis, as the medium inhibits the growth of most other microorganisms. When growing Neisseria meningitidis, one usually starts with a normally sterile body fluid (blood or CSF), so a plain chocolate agar is used. Thayer–Martin agar was initially developed in 1964, with an improved formulation published in 1966.[1][2][3]
Comparison of two culture media types used to grow Neisseria gonorrhoeae bacteria.
Known as overgrowth, note that the non-selective chocolate agar medium on the left, due to its composition, allowed for the growth of organismal colonies other than those of Neisseria gonorrhoeae, while the selective Thayer–Martin medium on the right, containing antimicrobials that inhibit the growth of organisms other than N. gonorrhoeae, shows no overgrowth, but is positive for N. gonorrhoeae bacteria.
Componentsedit
It usually contains the following combination of antibiotics, which make up the VPN acronym:
Polymyxin, also known as colistin, which is added to kill most Gram-negative organisms except Neisseria, although some other Gram-negative organisms such as Legionella are also resistant
^THAYER JD, MARTIN JE (January 1964). "A Selective Medium for the Cultivation of N. Gonorrhoeae and N. Meningitidis". Public Health Rep. 79 (1): 49–57. doi:10.2307/4592051. JSTOR 4592051. PMC1915495. PMID 14105729.
^Thayer JD, Martin JE (June 1966). "Improved medium selective for cultivation of N. gonorrhoeae and N. meningitidis". Public Health Rep. 81 (6): 559–62. doi:10.2307/4592771. JSTOR 4592771. PMC1919807. PMID 4957043.
thayer, martin, agar, thayer, martin, medium, agar, mueller, hinton, agar, with, chocolate, sheep, blood, antibiotics, used, culturing, primarily, isolating, pathogenic, neisseria, bacteria, including, neisseria, gonorrhoeae, neisseria, meningitidis, medium, i. Thayer Martin agar or Thayer Martin medium or VPN agar is a Mueller Hinton agar with 5 chocolate sheep blood and antibiotics It is used for culturing and primarily isolating pathogenic Neisseria bacteria including Neisseria gonorrhoeae and Neisseria meningitidis as the medium inhibits the growth of most other microorganisms When growing Neisseria meningitidis one usually starts with a normally sterile body fluid blood or CSF so a plain chocolate agar is used Thayer Martin agar was initially developed in 1964 with an improved formulation published in 1966 1 2 3 Comparison of two culture media types used to grow Neisseria gonorrhoeae bacteria Known as overgrowth note that the non selective chocolate agar medium on the left due to its composition allowed for the growth of organismal colonies other than those of Neisseria gonorrhoeae while the selective Thayer Martin medium on the right containing antimicrobials that inhibit the growth of organisms other than N gonorrhoeae shows no overgrowth but is positive for N gonorrhoeae bacteria Components editIt usually contains the following combination of antibiotics which make up the VPN acronym Vancomycin which is able to kill most Gram positive organisms although some Gram positive organisms such as Lactobacillus and Pediococcus are intrinsically resistant Polymyxin also known as colistin which is added to kill most Gram negative organisms except Neisseria although some other Gram negative organisms such as Legionella are also resistant Nystatin which can kill most fungi Trimethoprim inhibits swarming of Proteus spp 4 Clinical implications editA negative culture on Thayer Martin in a patient exhibiting symptoms of pelvic inflammatory disease most likely indicates an infection with Chlamydia trachomatis citation needed References edit THAYER MARTIN Agar Base THAYER JD MARTIN JE January 1964 A Selective Medium for the Cultivation of N Gonorrhoeae and N Meningitidis Public Health Rep 79 1 49 57 doi 10 2307 4592051 JSTOR 4592051 PMC 1915495 PMID 14105729 Thayer JD Martin JE June 1966 Improved medium selective for cultivation of N gonorrhoeae and N meningitidis Public Health Rep 81 6 559 62 doi 10 2307 4592771 JSTOR 4592771 PMC 1919807 PMID 4957043 Tankeshwar Acharya 2016 06 13 Modified Thayer Martin Agar Composition preparation uses and colony characteristics Learn Microbiology Online Retrieved 2020 10 28 nbsp This microbiology related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Thayer Martin agar amp oldid 1163334476, wikipedia, wiki, book, books, library,
