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Raccagni AR, Bruzzesi E, Spagnuolo V, Canetti D, Castagna A, Nozza S. 'Multidrug-resistant Mycoplasma genitalium urethritis: successful eradication with sequential therapy. Sex Transm Infect 2023; 99:77. [PMID: 36601744 DOI: 10.1136/sextrans-2022-055678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
| | - Elena Bruzzesi
- Infectious Diseases Unit, Vita-Salute San Raffaele University, Milano, Italy
| | | | - Diana Canetti
- Infectious Diseases Unit, San Raffaele Hospital, Milano, Italy
| | - Antonella Castagna
- Infectious Diseases Unit, Vita-Salute San Raffaele University, Milano, Italy.,Infectious Diseases Unit, San Raffaele Hospital, Milano, Italy
| | - Silvia Nozza
- Infectious Diseases Unit, San Raffaele Hospital, Milano, Italy
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Fougas J, Hiquet J, Christin E, Dubourg O, Grosleron BN, Cazanave C, Gromb-Monnoyeur S. Sexually transmitted infections among victims attending a French sexual offence centre. Sex Transm Infect 2018; 93:451. [PMID: 28827306 DOI: 10.1136/sextrans-2016-052968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2016] [Revised: 02/13/2017] [Accepted: 03/08/2017] [Indexed: 11/04/2022] Open
Affiliation(s)
- J Fougas
- Laboratory of Forensic Sciences, Ethic and Medical Law, University of Bordeaux, Bordeaux, France
| | - J Hiquet
- Laboratory of Forensic Sciences, Ethic and Medical Law, University of Bordeaux, Bordeaux, France
| | - E Christin
- Laboratory of Forensic Sciences, Ethic and Medical Law, University of Bordeaux, Bordeaux, France
| | - O Dubourg
- Laboratory of Forensic Sciences, Ethic and Medical Law, University of Bordeaux, Bordeaux, France
| | - B N Grosleron
- Laboratory of Forensic Sciences, Ethic and Medical Law, University of Bordeaux, Bordeaux, France
| | - C Cazanave
- Department of Infectious and Tropical Diseases, Bordeaux University Hospital, Bordeaux, France
| | - S Gromb-Monnoyeur
- Laboratory of Forensic Sciences, Ethic and Medical Law, University of Bordeaux, Bordeaux, France
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Gundevia Z, Foster R, Jamil MS, McNulty A. Positivity at test of cure following first-line treatment for genital Mycoplasma genitalium: follow-up of a clinical cohort. Sex Transm Infect 2014; 91:11-3. [PMID: 25096921 DOI: 10.1136/sextrans-2014-051616] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
OBJECTIVES To describe antibiotic use for treatment of Mycoplasma genitalium (MG) at an urban sexual health centre in Australia. To describe MG positivity rates in those returning for 1 month test of cure (TOC) following first-line antibiotic treatment for MG. METHODS Retrospective cross-sectional case-note review for all patients diagnosed with MG at Sydney Sexual Health Centre from 2009 to 2013. RESULTS Two hundred and eighteen MG cases were identified; 66% were male and 90% were symptomatic at presentation. Four people did not return for treatment. Azithromycin containing regimens were prescribed as first-line treatment in 88% of cases; azithromycin 1 g stat in 75% of cases and a course of extended azithromycin 1 g stat plus 500 mg daily for 4 days in 14% of cases. TOC was performed in 53% (95% CI 46% to 60%) of cases and 28% (95% CI 20% to 38%) of these cases were MG-positive at TOC. Of those having a MG-positive result at TOC, 26% received azithromycin 1 g stat and 33% received extended azithromycin. Accounting for cases lost to follow-up in azithromycin containing regimens, the positive MG TOC rate was estimated to be between 15% and 61%. CONCLUSIONS High rates of MG positivity were found in those attending TOC following first-line treatment of MG with azithromycin containing regimens.
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Affiliation(s)
- Zarin Gundevia
- Department of Sexual Health Medicine, Sydney Sexual Health Centre, Sydney, Australia
| | - Rosalind Foster
- Department of Sexual Health Medicine, Sydney Sexual Health Centre, Sydney, Australia The Kirby Institute, University of New South Wales, Sydney, Australia
| | | | - Anna McNulty
- Department of Sexual Health Medicine, Sydney Sexual Health Centre, Sydney, Australia School of Public Health and Community Medicine, University of New South Wales, Sydney, Australia
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Abstract
Weibull, C. (Central Bacteriological Laboratory of Stockholm City, Stockholm, Sweden) and Kerstin Hammarberg. Occurrence of catalase in pleuropneumonia-like organisms and bacterial L forms. J. Bacteriol. 84:520-525. 1962.-The catalase activity of six pleuropneumonia-like organisms (PPLO), four stable Proteus L forms, and four normal strains of Proteus mirabilis was determined quantitatively. The PPLO (strains of the species Mycoplasma agalactiae, hominis, laidlawii, mycoides, and strains isolated from tissue cultures) exhibited no measurable catalase activity. The L forms decomposed H(2)O(2) approximately ten times as rapidly as the normal bacteria from which they were derived.
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Abstract
The light intensity-fusion frequency relationship of the goldfish electroretinogram follows the Ferry-Porter law except at the higher intensities. Maximum fusion frequency increases with temperature thus contradicting the results of studies elsewhere on the behavioral responses in sunfish.
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Abstract
Gill, James W. (University of New Hampshire, Durham). Culture and metabolism of Mycoplasma gallisepticum. J. Bacteriol. 83:213-218. 1962.-Mycoplasma gallisepticum A5969, a strong-growing pleuropneumonia-like organism pathogenic for poultry, was found to be intolerant of extremes of temperature and potassium ion concentration. It ferments glucose to the benefit of cell yield, but glycolysis appears not to be essential to growth. Anaerobic growth can be maintained if pyruvate is added as a hydrogen recipient.A transamination system between glutamic acid and aspartic acid, more rapid toward the formation of aspartic acid, was found in a frozen-cell preparation. Two small peptides were observed to be produced by the organism and liberated into the medium under normal growth conditions. The composition of the peptides shows a relationship to the cell wall of certain bacteria.
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MOROWITZ HJ, TOURTELLOTTE ME, GUILD WR, CASTRO E, WOESE C. The chemical composition and submicroscopic morphology of Mycoplasma gallisepticum, avian PPLO 5969. J Mol Biol 1998; 4:93-103. [PMID: 14476188 DOI: 10.1016/s0022-2836(62)80041-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Weibull, C. (Central Bacteriological Laboratory of Stockholm City, Stockholm, Sweden) and Britt-Marie Lundin. Morphology of pleuropneumonia-like organisms and bacterial L forms grown in liquid media. J. Bacteriol. 85:440-445. 1963.-Cells of Mycoplasma hominis, M. laidlawii, and two tissue-culture strains of pleuropneumonia-like organisms (PPLO) moving freely in liquid medium were photographed with an electronic flash as the light source. The photomicrographs thus obtained demonstrated that, in young cultures of high viability, the cells of these organisms were mainly filamentous or, in the case of M. laidlawii, coccoid. In old cultures of the same organisms containing predominantly nonviable cells, granular and vesicular elements were found. By the use of the same photographic technique, liquid cultures of a stable Proteus L form were studied. Although no filaments of uniform thickness were found, there were spherical bodies and some threadlike material connected with the spheres. When samples of PPLO cultures containing filamentous forms were transferred to agar blocks, the filaments were converted to more or less spherical bodies. This conversion could be prevented by fixing the PPLO with formaldehyde. The morphology of Proteus L forms was not noticeably altered by fixation with this reagent.
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HAKALA MT, HOLLAND JF, HOROSZEWICZ JS. Change in pyrimidine deoxyribonucleoside metabolism in cell culture caused by Mycoplasma (PPLO) contamination. Biochem Biophys Res Commun 1998; 11:466-71. [PMID: 13952012 DOI: 10.1016/0006-291x(63)90094-9] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
Weibull, C. (Central Bacteriological Laboratory of Stockholm City, Stockholm, Sweden), and Britt-Marie Lundin. Size and shape of pleuropneumonia-like organisms grown in liquid media. J. Bacteriol. 84:513-519. 1962.-Samples of liquid cultures containing mainly nonaggregated cells of Mycoplasma agalactiae or M. laidlawii were transferred to agar blocks containing the same medium as the liquid cultures. By use of a phase-contrast microscope, photomicrographs were made of the slide cultures immediately after they had been prepared, and the dimensions of a large number of pleuropneumonia-like organisms (PPLO) were measured. These measurements indicated that, in young cultures (incubated for 24 to 48 hr), the size of the cells did not vary much more than that of ordinary bacteria; 95% of the cells had a width of 0.2 to 0.6 mu. The growth of individual PPLO was followed during incubation of the slide cultures. It was found that 80 to 100% of the cells present in liquid overnight cultures divided and gave rise to microcolonies within a few hours. Rod-shaped, ellipsoidal, and spherical cells were seen in these cultures. Liquid cultures incubated for several days contained mainly spherical cells. Fewer than 5% of the cells in these cultures showed any indication of growth during incubation in slide cultures for 5 days. Photomicrographs of cells of M. agalactiae moving freely in liquid medium were taken with an electronic flash as the light source. The photographs thus obtained directly demonstrated the existence of rod-shaped cells.
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ROSENBAUM MJ, EDWARDS EA, FRANK PF, PIERCE WE, CRAWFORD YE, MILLER LF. EPIDEMIOLOGY AND PREVENTION OF ACUTE RESPIRATORY DISEASE IN NAVAL RECRUITS. I. TEN YEARS' EXPERIENCE WITH MICROBIAL AGENTS ISOLATED FROM NAVAL RECRUITS WITH ACUTE RESPIRATORY DISEASE. Am J Public Health Nations Health 1996; 55:38-46. [PMID: 14246106 PMCID: PMC1256139 DOI: 10.2105/ajph.55.1.38] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Abstract
Schimke, Robert T. (National Institutes of Health, Bethesda, Md.) and Michael F. Barile. Arginine metabolism in pleuropneumonia-like organisms isolated from mammalian cell culture. J. Bacteriol. 86:195-206. 1963.-Arginine degradation is a significant metabolic process for pleuropneumonia-like organisms (PPLO; Mycoplasma) isolated from cell culture. The conversion of arginine to ornithine in PPLO-contaminated cell culture was rapid, and occurred by the arginine dihydrolase pathway involving arginine deiminase, ornithine transcarbamylase, and carbamyl phosphokinase. In the absence of PPLO contamination, arginine conversion to ornithine was minimal and took place by an arginase activity present in the cell culture, but not in the PPLO. All five PPLO strains isolated from cell culture accomplished the conversion of arginine to ornithine, and contained the requisite enzyme of the arginine dihydrolase system, whereas PPLO-free cell cultures did not. Supplementation of PPLO culture broth with arginine increased the extent of PPLO growth. When the arginine content of the culture limited growth, arginine was completely converted to ornithine. When growth was limited in the presence of excess arginine, citrulline was the major breakdown product. It is suggested that the conversion of arginine to ornithing constitutes a significant, and possibly major, source of adenosine triphosphate for this class of organisms.
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Abstract
Langenfeld, M. G. (University of South Dakota, Vermillion) and P. F. Smith. Phosphorus distribution in pleuropneumonia-like and L-type organisms. J. Bacteriol. 86:1216-1219. 1963.-Sterol-requiring and sterol-nonrequiring pleuropneumonia-like organisms, salt-requiring and salt-nonrequiring L forms, and their parent bacteria, were analyzed for total, acid-soluble, lipid, and nucleic acid phosphorus. Total phosphorus in all types of organisms was equivalent, except for salt-requiring L forms in which it was greatly elevated. The elevated total phosphorus reflected a great increase in acid-soluble phosphorus in the salt-requiring L forms. The lipid phosphorus content of pleuropneumonia-like organisms and salt-nonrequiring L forms was significantly greater than in the other types of organisms. The nucleic acid phosphorus content of salt-requiring L forms was lower than that of all other organisms
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KRAEMER PM. MYCOPLASMA (PPLO) FROM COVERTLY CONTAMINATED TISSUE CULTURES: DIFFERENCES IN ARGININE DEGRADATION BETWEEN STRAINS. Exp Biol Med (Maywood) 1996; 117:910-8. [PMID: 14244988 DOI: 10.3181/00379727-117-29734] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Abstract
A previously unidentified type of Mycoplasma found as a contaminant in tissue cultures and in a culture of Eaton agent, is identical with a newly recognized human oral type.I am indebted to Drs Herdersheê and Chanock for sending me their cultures and relevant information.
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TULLY JG, RUCHMAN I. RECOVERY, IDENTIFICATION, AND NEUROTOXICITY OF SABIN'S TYPE A AND C MOUSE MYCOPLASMA (PPLO) FROM LYOPHILIZED CULTURES. Exp Biol Med (Maywood) 1996; 115:554-8. [PMID: 14121663 DOI: 10.3181/00379727-115-28966] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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GIRARDI AJ, HAYFLICK L, LEWIS AM, SOMERSON NL. RECOVERY OF MYCOPLASMAS IN THE STUDY OF HUMAN LEUKAEMIA AND OTHER MALIGNANCIES. Nature 1996; 205:188-9. [PMID: 14276278 DOI: 10.1038/205188a0] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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FOWLER RC, COBLE DW, KRAMER NC, BROWN TM. STARCH GEL ELECTROPHORESIS OF A FRACTION OF CERTAIN OF THE PLEUROPNEUMONIA-LIKE GROUP OF MICROORGANISMS. J Bacteriol 1996; 86:1145-51. [PMID: 14086081 PMCID: PMC278598 DOI: 10.1128/jb.86.6.1145-1151.1963] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Fowler, Richard C. (George Washington University School of Medicine, Washington, D.C.), Don W. Coble, Norman C. Kramer, and Thomas McP. Brown. Starch gel electrophoresis of a fraction of certain of the pleuropneumonia-like group of microorganisms. J. Bacteriol. 86:1145-1151. 1963.-Starch gel electrophoresis is suggested as a means of further characterizing strains of the pleuropneumonia-like group of microorganisms (PPLO), defined herein as including both the various "L" forms of bacteria and the Mycoplasmataceae. The techniques used may be varied to "select" other groups of proteins or classes of compounds (e.g., glycoproteins, lipoproteins, and enzymes). Only the results by starch gel electrophoresis on the soluble portion of sonically treated, washed cultures, grown in a pancreatic digest of beef heart enriched with bovine serum, are reported. As yet, differences appear more significant than similarities among the electrophoretically separable proteins. The demonstration of characteristic protein patterns for each strain studied suggests possibilities of further dividing serological groups into sero-logically distinct subtypes. Tentative migration values (E(f)) have been assigned to the protein bands for convenience in designation. Numerous interrelationships are thereby suggested.
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RAZIN S, MICHMANN J, SHIMSHONI Z. THE OCCURRENCE OF MYCOPLASMA (PLEUROPNEUMONIA-LIKE ORGANISMS, PPLO) IN THE ORAL CAVITY OF DENTULOUS AND EDENTULOUS SUBJECTS. J Dent Res 1996; 43:402-5. [PMID: 14159820 DOI: 10.1177/00220345640430031101] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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ARMSTRONG D, HENLE G, SOMERSON NL, HAYFLICK L. CYTOPATHOGENIC MYCOPLASMAS ASSOCIATED WITH TWO HUMAN TUMORS. I. ISOLATION AND BIOLOGICAL ASPECTS. J Bacteriol 1996; 90:418-24. [PMID: 14329455 PMCID: PMC315660 DOI: 10.1128/jb.90.2.418-424.1965] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Armstrong, D. (The Children's Hospital of Philadelphia, Philadelphia, Pa.), G. Henle, N. L. Somerson, and L. Hayflick. Cytopathogenic mycoplasmas associated with two human tumors. I. Isolation and biological aspects. J. Bacteriol. 90:418-424. 1965.-Mycoplasmas were isolated from cell cultures of two benign human tumors. The first isolate contained two mycoplasmas, one a well-known human species (Mycoplasma hominis type I) and frequent tissue culture contaminant, and the other a recently reported new type. The second isolate was a mycoplasma of the newly described type. The mycoplasmas could be reisolated, after one or more passages through tissue culture, from extracts of the original tumor tissue. The relationship of the organisms to the neoplasms remains obscure. Both isolates produce cytopathic effect (CPE) and acidification of medium in a variety of tissue cultures. The CPE may be diminished, but not abolished, by increasing concentrations of arginine in the tissue culture media. Infection of various tissue cultures with the mycoplasmas did not result in interference to super-infection with vesicular stomatitis virus.
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TOURTELLOTTE ME, JENSEN RG, GANDER GW, MOROWITZ HJ. LIPID COMPOSITION AND SYNTHESIS IN THE PLEUROPNEUMONIA-LIKE ORGANISM MYCOPLASMA GALLISEPTICUM. J Bacteriol 1996; 86:370-9. [PMID: 14071787 PMCID: PMC278445 DOI: 10.1128/jb.86.3.370-379.1963] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tourtellotte, Mark E. (University of Connecticut, Storrs), Robert G. Jensen, George W. Gander, and Harold J. Morowitz. Lipid composition and synthesis in the pleuropneumonia-like organism Mycoplasma gallisepticum. J. Bacteriol. 86:370-379. 1963.-A simple method of extracting lipids from cells of Mycoplasma gallisepticum by use of silicic acid columns is described. Proteolipids (peptides) extracted with chloroform-methanol (2:1) by other methods were not extracted with the lipid by this method, nor were proteins and nucleic acids. Fractionation of lipids of M. gallisepticum demonstrated the presence of saturated hydrocarbons, free fatty acids, cholesterol, cholesterol esters, di- and triglycerides, phosphatidic acids, cephalins, inositides, phosphatidyl choline, and sphingomyelin. The fatty acid composition of the various fractions was also determined. The positive identification of cholesterol and cholesterol esters in this organism by chromatography, melting point, and infrared spectroscopy confirms reports by others that cholesterol is present in the pleuropneumonia group of microorganisms. The incorporation of P(32) orthophosphate into four phospholipid fractions, of oleic acid-1-C(14) into neutral and phospholipids, and cholesterol-4-C(14) into cholesterol esters clearly demonstrated the ability of M. gallisepticum to synthesize these lipids from simpler compounds. Between 70 and 80% of the lipid of this organism was found in the membrane.
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GARDNER PS, ELDERKIN FM, WALL AH. SEROLOGICAL STUDY OF RESPIRATORY SYNCYTIAL VIRUS INFECTIONS IN INFANCY AND CHILDHOOD. Br Med J 1996; 2:1570-3. [PMID: 14211759 PMCID: PMC1817599 DOI: 10.1136/bmj.2.5424.1570] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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RASK-NIELSEN R. COOMBS-POSITIVE HEMOLYTIC ANEMIA AND GENERALIZED AMYLOIDOSIS IN MICE FOLLOWING TRANSMISSION OF SUBCELLULAR LEUKEMIC MATERIAL. Exp Biol Med (Maywood) 1996; 116:1154-9. [PMID: 14230371 DOI: 10.3181/00379727-116-29478] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Abstract
Mycoplasma isolates were cultured from 15 antibiotic-free cell cultures obtained from a single laboratory. Complement-fixation tests showed that these isolates were antigenically related to each other but were unrelated to M. hominis type 1, M. hominis type 2, M. arthritidis, M. laidlawii type B, Mycoplasma sp. H.Ep. #2 (Barile), or M. salivarium. Examination of serum used to feed the infected cell lines revealed no Mycoplasma. Infection resulting from cross-contamination by a single Mycoplasma strain from one cell culture to another was investigated. Although the organisms were not found in the air over the work area, aerosols containing these contaminants were produced in tissue culture bottles during the trypsinization of cell monolayers. The minimal infectious dose of Mycoplasma for tissue cultures was measured, and it was determined that one organism was capable of initiating an infection in a tissue culture. The pattern of contamination and the small dose required for infection indicated that Mycoplasma contamination was spread from one tissue culture to another via aerosols. It was demonstrated that Mycoplasma can be transferred from one cell culture to another through the use of a common burette for dispensing medium.
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Abstract
Ford, Denys K. (University of British Columbia, Vancouver, Canada), and Joyce Macdonald. Morphology of human genital "T-strain" pleuropneumonia-like organisms. J. Bacteriol. 85:649-653. 1963.-The morphology of Shepard's "T-strain" organisms from the human genital tract was investigated. The incubation of "T-strains" in 20% CO(2) with 80% nitrogen for 4 to 5 days caused surface outgrowth from the central core of the colonies embedded in the agar. Filtration through HA, PH, and VC Millipore filters showed that the elementary particles of "T-strains" were between 0.3 and 0.1 mu in diameter. "T-strain" pleuropneumonia-like organisms (PPLO) from broth cultures, stained by Giemsa's method, were seen to be minute, spherical particles, similar in size to the particles of the large-colony strains. Colonies of "T-strains," when prepared by the microculture, fixed-agar-block, and Formvar methods, resembled those of large-colony PPLO. It was concluded that "T-strain" organisms were true PPLO.
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