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Ezeji JC, Sarikonda DK, Hopperton A, Erkkila HL, Cohen DE, Martinez SP, Cominelli F, Kuwahara T, Dichosa AEK, Good CE, Jacobs MR, Khoretonenko M, Veloo A, Rodriguez-Palacios A. Parabacteroides distasonis: intriguing aerotolerant gut anaerobe with emerging antimicrobial resistance and pathogenic and probiotic roles in human health. Gut Microbes 2022; 13:1922241. [PMID: 34196581 PMCID: PMC8253142 DOI: 10.1080/19490976.2021.1922241] [Citation(s) in RCA: 108] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Parabacteroides distasonis is the type strain for the genus Parabacteroides, a group of gram-negative anaerobic bacteria that commonly colonize the gastrointestinal tract of numerous species. First isolated in the 1930s from a clinical specimen as Bacteroides distasonis, the strain was re-classified to form the new genus Parabacteroides in 2006. Currently, the genus consists of 15 species, 10 of which are listed as 'validly named' (P. acidifaciens, P. chartae, P. chinchillae, P. chongii, P. distasonis, P. faecis, P. goldsteinii, P. gordonii, P. johnsonii, and P. merdae) and 5 'not validly named' (P. bouchesdurhonensis, P. massiliensis, P. pacaensis, P. provencensis, and P. timonensis) by the List of Prokaryotic names with Standing in Nomenclature. The Parabacteroides genus has been associated with reports of both beneficial and pathogenic effects in human health. Herein, we review the literature on the history, ecology, diseases, antimicrobial resistance, and genetics of this bacterium, illustrating the effects of P. distasonis on human and animal health.
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Affiliation(s)
- Jessica C. Ezeji
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Daven K. Sarikonda
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Austin Hopperton
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,College of Medicine and Life Sciences, University of Toledo, Toledo, Ohio, USA
| | - Hailey L. Erkkila
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Daniel E. Cohen
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | | | - Fabio Cominelli
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Department of Pathology, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA,Germ-Free and Gut Microbiome Core, Case Western Reserve University, Cleveland, OH, United States
| | - Tomomi Kuwahara
- Department of Microbiology, Faculty of Medicine, Kagawa University, Miki, Kagawa, Japan
| | - Armand E. K. Dichosa
- B-10 Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
| | - Caryn E. Good
- Department of Pathology, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | - Michael R. Jacobs
- Department of Pathology, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
| | | | - Alida Veloo
- University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Alexander Rodriguez-Palacios
- Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Division of Gastroenterology and Liver Disease, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA,Germ-Free and Gut Microbiome Core, Case Western Reserve University, Cleveland, OH, United States,University Hospitals Research and Education Institute, University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA,CONTACT Alexander Rodriguez-Palacios Digestive Diseases Research Institute, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
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Fuglsang E, Pizzolla A, Krych L, Nielsen DS, Brooks AG, Frøkiær H, Reading PC. Changes in Gut Microbiota Prior to Influenza A Virus Infection Do Not Affect Immune Responses in Pups or Juvenile Mice. Front Cell Infect Microbiol 2018; 8:319. [PMID: 30258820 PMCID: PMC6145060 DOI: 10.3389/fcimb.2018.00319] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 08/22/2018] [Indexed: 01/13/2023] Open
Abstract
Previous studies demonstrated that oral antibiotic (ABX) treatment prior to and during influenza A virus (IAV) infection of adult mice profoundly altered gut microbiota (GM) and was associated with increased susceptibility and impaired immunity to IAV. We examined the impact of ABX during critical times relevant to the establishment of GM in early life (using perinatal treatment of neonates and direct treatment of juvenile mice) and asked whether cessation of ABX treatment in early life had lasting effects on GM composition and anti-IAV immunity. ABX treatment significantly changed GM composition in juvenile mice and in ABX-treated dams. However, if ABX treatment ceased at the time of infection, neither neonates nor juvenile mice showed enhanced susceptibility to IAV, nor were major differences detected in cellular and humoral adaptive antiviral immunity. Thus, while ABX treatment alters GM diversity in early life, cessation and subsequent re-colonization correlates with effective immunity against IAV.
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Affiliation(s)
- Eva Fuglsang
- Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Angela Pizzolla
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia
| | - Lukasz Krych
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - Dennis S Nielsen
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
| | - Andrew G Brooks
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia
| | - Hanne Frøkiær
- Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Patrick C Reading
- Department of Microbiology and Immunology, The Peter Doherty Institute for Infection and Immunity, The University of Melbourne, Melbourne, VIC, Australia.,The Peter Doherty Institute for Infection and Immunity, WHO Collaborating Centre for Reference and Research on Influenza, Melbourne, VIC, Australia
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Sydenham TV, Jensen BH, Petersen AM, Krogfelt KA, Justesen US. Antimicrobial resistance in the Bacteroides fragilis group in faecal microbiota from healthy Danish children. Int J Antimicrob Agents 2017; 49:573-578. [DOI: 10.1016/j.ijantimicag.2017.01.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Revised: 01/02/2017] [Accepted: 01/06/2017] [Indexed: 10/19/2022]
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Urbán E, Horváth Z, Sóki J, Lázár G. First Hungarian case of an infection caused by multidrug-resistant Bacteroides fragilis strain. Anaerobe 2015; 31:55-8. [DOI: 10.1016/j.anaerobe.2014.09.019] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 09/19/2014] [Accepted: 09/24/2014] [Indexed: 11/28/2022]
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Molina J, Barrantes G, Quesada-Gómez C, Rodríguez C, Rodríguez-Cavallini E. Phenotypic and Genotypic Characterization of Multidrug-ResistantBacteroides,Parabacteroidesspp., andPseudoflavonifractorfrom a Costa Rican Hospital. Microb Drug Resist 2014; 20:478-84. [DOI: 10.1089/mdr.2013.0180] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Affiliation(s)
- José Molina
- Laboratorio de Investigación en Bacteriología Anaerobia, Facultad de Microbiología, Centro de Investigación en Enfermedades Tropicales, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San José, Costa Rica
| | - Gloriana Barrantes
- Laboratorio de Investigación en Bacteriología Anaerobia, Facultad de Microbiología, Centro de Investigación en Enfermedades Tropicales, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San José, Costa Rica
| | - Carlos Quesada-Gómez
- Laboratorio de Investigación en Bacteriología Anaerobia, Facultad de Microbiología, Centro de Investigación en Enfermedades Tropicales, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San José, Costa Rica
| | - César Rodríguez
- Laboratorio de Investigación en Bacteriología Anaerobia, Facultad de Microbiología, Centro de Investigación en Enfermedades Tropicales, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San José, Costa Rica
| | - Evelyn Rodríguez-Cavallini
- Laboratorio de Investigación en Bacteriología Anaerobia, Facultad de Microbiología, Centro de Investigación en Enfermedades Tropicales, Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San José, Costa Rica
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Yehya M, Hamze M, Mallat H, Dabbousi F. Prevalence and antibiotic susceptibility of Bacteroides fragilis group isolated from stool samples in North Lebanon. Braz J Microbiol 2014; 44:807-12. [PMID: 24516449 PMCID: PMC3910193 DOI: 10.1590/s1517-83822013000300022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2012] [Accepted: 09/10/2012] [Indexed: 11/22/2022] Open
Abstract
Fifty one strains of the Bacteroides fragilis group were isolated from 45 fecal samples. Classical phenotypic identification showed that 16 isolates were B. thetaiotaomicron, 12 B. uniformis, 9 B. eggerthii, 7 B. vulgatus, 3 B. caccae, 2 Parabacteroides distasonis with 1 identified B. ovatus and 1 B. fragilis. The 51 strains were tested for susceptibility against 16 antimicrobial agents and the MICs for metronidazole were determined. The tests showed that imipenem, meropenem and chloramphenicol were the most effective antibiotics (98%, 98% and 92.16% of susceptibility, respectively) followed by ticarcillin/clavulanic acid, piperacillin/tazobactam, rifampin (88.24% susceptibility), moxifloxacin 86.27% and tigecycline 84.31%. Ofloxacin and cefotaxime were the least effective antibiotics with 27.45% and 0% of activity respectively. Only six of the 51 isolated strains were resistant to metronidazole with MICs = 64 mg/L (1 strain) and > 256 mg/L (5 strains).
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Affiliation(s)
- Mariam Yehya
- Health and Environmental Microbiology Laboratory, AZM Centre for Research in Biotechnology and its Application, Doctoral School, Lebanese University, Tripoli, Lebanon
| | - Monzer Hamze
- Health and Environmental Microbiology Laboratory, AZM Centre for Research in Biotechnology and its Application, Doctoral School, Lebanese University, Tripoli, Lebanon. ; Faculty of Public Health, Section 3, Lebanese University, Tripoli, Lebanon
| | - Hassan Mallat
- Health and Environmental Microbiology Laboratory, AZM Centre for Research in Biotechnology and its Application, Doctoral School, Lebanese University, Tripoli, Lebanon. ; Faculty of Public Health, Section 3, Lebanese University, Tripoli, Lebanon
| | - Fouad Dabbousi
- Health and Environmental Microbiology Laboratory, AZM Centre for Research in Biotechnology and its Application, Doctoral School, Lebanese University, Tripoli, Lebanon. ; Faculty of Public Health, Section 3, Lebanese University, Tripoli, Lebanon
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Quesada-Gómez C, Rodríguez-Cavallini E, Rodríguez C. Scarce detection of mobile erm genes associated with tetQ in Bacteroides and Parabacteroides from Costa Rica. Anaerobe 2013; 21:18-21. [PMID: 23528984 DOI: 10.1016/j.anaerobe.2013.03.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Revised: 02/23/2013] [Accepted: 03/12/2013] [Indexed: 10/27/2022]
Abstract
The frequency of finding of clindamycin-resistant anaerobic bacteria in clinical samples has doubled from 2008 to 2010 in Costa Rica. To determine whether this increase is due to dissemination of erm genes aided by tetQ elements, we analyzed 100 isolates of Bacteroides or Parabacteroides from a regional hospital, a national hospital, and the community. Antimicrobial susceptibilities were recorded with a broth micro-dilution method and erm genes were detected by PCR and Southern blotting. In addition, plasmid isolation and mating experiments were performed to clarify the location and mobility of the detected erm genes. Resistance to clindamycin was by far more frequent in the regional hospital (72%) than in the national hospital (29%) and the community (26%). Resistance to tetracycline was even more common, with the community (85%) outweighing the hospitals (71-72%). While MIC of clindamycin were higher in the hospitals than in the community (P < 0.05), the opposite was seen for tetracycline (P < 0.0001). Of the sought-after genes, only ermG (n = 2), ermA (n = 1), and ermF (n = 1) were detected in the hospitals and ermF in the community (n = 2). In opposition to the low frequency of finding of erm genes, 71% of the isolates were positive for tetQ. None of the detected genes were encoded on plasmids. Only three isolates from the hospitals transferred their erm genes laterally. By contrast, 13 hospital isolates and two community isolates transferred tetQ. Despite the widespread finding of tetracycline-resistant tetQ-positive bacteria, mobile erm genes were rare in our bacterial collection. We conclude that the detected erm genes are likely not included in typical conjugative transposons of Bacteroides and Parabacteroides.
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Affiliation(s)
- Carlos Quesada-Gómez
- Facultad de Microbiología, and Centro de Investigación en Enfermedades Tropicales (CIET), Universidad de Costa Rica, Ciudad Universitaria Rodrigo Facio, San Pedro Montes de Oca 2060, San José, Costa Rica
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Ferreira LQ, Avelar KES, Vieira JMBD, de Paula GR, Colombo APV, Domingues RMCP, Ferreira MCS. Association between the cfxA gene and transposon Tn4555 in Bacteroides distasonis strains and other Bacteroides species. Curr Microbiol 2007; 54:348-53. [PMID: 17486409 DOI: 10.1007/s00284-006-0411-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2006] [Accepted: 11/14/2006] [Indexed: 10/23/2022]
Abstract
The Bacteroides genus, the most prevalent anaerobic bacteria of the intestinal tract, carries a plethora of the mobile elements, such as plasmids and conjugative and mobilizable transposons, which are probably responsible for the spreading of resistance genes. Production of beta-lactamases is the most important resistance mechanism including cephalosporin resistance to beta-lactam agents in species of the Bacteroides fragilis group. In our previous study, the cfxA gene was detected in B. distasonis species, which encodes a clinically significant broad-spectrum beta-lactamase responsible for widespread resistance to cefoxitin and other beta-lactams. Such gene has been associated with the mobilizable transposon Tn4555. Therefore, the aim of this study was to detect the association between the cfxA gene and the presence of transposon Tn4555 in 53 Bacteroides strains isolated in Rio de Janeiro, Brazil, by PCR assay. The cfxA gene was detected in 11 strains and the Tn4555 in 15. The transposon sequence revealed similarities of approximately 96% with the B. vulgatus sequence which has been deposited in GenBank. Hybridization assay was performed in attempt to detect the cfxA gene in the transposon. It was possible to associate the cfxA gene in 11 of 15 strains that harbored Tn4555. Among such strains, 9 presented the cfxA gene as well as Tn4555, but in 2 strains the cfxA gene was not detected by PCR assay. Our results confirm the involvement of Tn4555 in spreading the cfxA gene in Bacteroides species.
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Affiliation(s)
- Livia Q Ferreira
- Universidade Federal do Rio de Janeiro, Instituto de Microbiologia Professor Paulo de Góes, Departamento de Microbiologia Médica, Laboratório de Biologia de Anaeróbios-Av. Carlos Chagas Filho, Cidade Universitária, Rio de Janeiro, Brasil.
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B D Vieira JM, Boente RF, Rodrigues Miranda K, Avelar KES, M C P Domingues R, Candida de S Ferreira M. Decreased Susceptibility to Nitroimidazoles Among Bacteroides Species in Brazil. Curr Microbiol 2005; 52:27-32. [PMID: 16391998 DOI: 10.1007/s00284-005-0068-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2005] [Accepted: 06/13/2005] [Indexed: 10/25/2022]
Abstract
In this study, 197 strains of Bacteroides genus from different species and origins were evaluated with regard to their susceptibility to 5-nitroimidazoles (5-Ni)-such as tinidazole, ornidazole, and metronidazole-using the agar dilution method. The presence of nim genes was also investigated by polymerase chain reaction. It was found that 5.6% of Bacteroides strains among all origins showed decreased susceptibility (minimum inhibitory concentrations varying from 4 to 16 microg/ml) to at least one of the imidazoles studied without any known nim gene associate. Also, we detected one strain isolated from a polluted aquatic environment in which one nim gene was found and characterized as nim B using restriction fragment length polymorphism and sequencing. Hence, resistance to 5-Ni should be monitored closely because they constitute, among few drugs, the ones quite effective in treating Bacteroides infections.
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Affiliation(s)
- Jessica Manya B D Vieira
- Laboratório de Biologia de Anaeróbios, Departamento de Microbiologia Médica, Instituto de Microbiologia Professor Paulo de Góes, CCS, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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Sóki J, Edwards R, Urbán E, Fodor E, Beer Z, Nagy E. Screening of isolates from faeces for carbapenem-resistant Bacteroides strains; existence of strains with novel types of resistance mechanisms. Int J Antimicrob Agents 2004; 24:450-4. [PMID: 15519476 DOI: 10.1016/j.ijantimicag.2004.06.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2004] [Accepted: 06/30/2004] [Indexed: 11/26/2022]
Abstract
Isolates from faecal samples (n = 224) from the UK and Hungary were screened for carbapenem-resistant Bacteroides strains and were consecutively investigated for the resistance mechanisms through detection of cfiA genes, the presence or lack of insertion sequence insertions in their upstream regions and the production of carbapenemase activities. In this way, a significant number of strains (n = 7, 3.1%) were recovered. They included 2 Bacteroides fragilis strains (one in each country) which harboured cfiA genes, but which were not activated by insertion sequence elements; this is reminiscent of some novel clinical B. fragilis strains. The cfiA-negative strains exhibited lower levels of carbapenem resistance and varying levels of carbapenemase activity, suggesting that other resistance mechanisms may also exist.
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Affiliation(s)
- József Sóki
- Department of Clinical Microbiology, Faculty of Medicine, University of Szeged, Szeged, H-6725 Szeged, Somogyi Béla tér 1, Hungary.
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Nakano V, Avila-Campos MJ. Survey of antimicrobial susceptibility patterns of the bacteria of the Bacteroides fragilis group isolated from the intestinal tract of children. Mem Inst Oswaldo Cruz 2004; 99:319-24. [PMID: 15273807 DOI: 10.1590/s0074-02762004000300014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The bacteria of the Bacteroides fragilis group are considered important clinical pathogens and they are the most common anaerobes isolated from human endogenous infections. In this study, the susceptibility patterns to antibiotics and metals of 114 species of the B. fragilis group isolated from children with and without diarrhea were determined. Susceptibility was assayed by using an agar dilution method with Wilkins-Chalgren agar. All B. fragilis strains were resistant to lead and nickel, but susceptible to metronidazole and imipenem. beta-lactamase production was detected by using biological and nitrocefin methods, respectively, in 50% and 90.6% of the isolates of children with diarrhea and in 60% and 90% of the isolates of children without diarrhea. Our results show an increase of antibiotics and metals resistance in this microbial group, and a periodic evaluation of the antimicrobial susceptibility is needed. In Brazil, the contamination for antibiotics or metal ions is often observed, and it is suggested an increase the antimicrobial resistance surveillance of this microbial group, mainly those isolated from children's diarrhea.
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Affiliation(s)
- Viviane Nakano
- Departamento de Microbiologia, Universidade de São Paulo, São Paulo, SP, 05508-900, Brasil
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Abstract
In this study we investigated the presence of the cfxA gene (encoding a class A beta-lactamase) in 73 strains of the Bacteroides fragilis group belonging to the species B. distasonis (34), B. vulgatus (14), B. thetaiotaomicron (8), B. merdae (6), B. caccae (9) and B. ovatus (2) isolated from human intestinal microflora of healthy children and adults. Employing specific primers to the cfxA gene, a 312-bp amplified fragment was obtained in 2 strains of B. vulgatus and 9 strains, the majority from children, of B. distasonis. The expression of this enzyme was analysed by determining the MICs to cefoxitin and cefotaxime and values varied from 2 to >256 microg/ml of both cefoxitin and cefotaxime. Sequence analysis of the amplicons corresponding to the cfxA gene from B. distasonis and B. vulgatus revealed identical sequences between these isolates and high similarity with other beta-lactamase genes of anaerobes such as cfxA of B. vulgatus (99%) and cfxA2 of Prevotella intermedia (99%), both sequences of which deposited in Genbank under accession numbers U38243 and AF118110, respectively. However, a fragment obtained from a B. distasonis strain (EC17-4) showed a unique RFLP profile and 87% nucleotide similarity with cfxA and cfxA2 genes. These results seem to suggest a dissemination of these resistance determinants among Bacteroides species.
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Affiliation(s)
- Kátia Eliane Santos Avelar
- Instituto de Microbiologia Prof. Paulo de Góes, CCS, Bloco I, UFRJ Universidade Federal do Rio de Janeiro, Ilha do Fundão, RJ, CEP: 21941-590, Rio de Janeiro, Brazil
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