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Akinduti PA, Motayo BO, Maged EA, Isibor PO. Pathogenomic profile and clonal diversity of potential zoonotic MRSA-CC7-ST789-t091-SCCmecV from human skin and soft tissue infections. Sci Rep 2024; 14:19326. [PMID: 39164371 PMCID: PMC11335753 DOI: 10.1038/s41598-024-67388-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 07/10/2024] [Indexed: 08/22/2024] Open
Abstract
The whole genome sequence (WGS) of prevalent MRSA strains harboring mecA gene obtained from skin and soft tissue infections (SSTIs) in Nigerian hospitals were profiled for pathogenomic structure and evaluated for clonal diversity. The two MRSA strains identified among 66 isolated multi-drug resistant S. aureus from a collection of 256 clinical samples were phenotyped for antibiotic resistance and genotyped for mecA, SCCmec, and spa types. The mecA positive MRSA was analysed using whole-genome sequencing for resistomes, virulomes, phylogenomic profiles and clonal diversity. The identified MRSA-CC7-ST789-t091-SCCmecV strains from a female child (aged 1 year) with severe otorrhea and an adult male (aged 23) with purulent wound abscess showed high-level resistance to streptomycin, vancomycin, kanamycin, sulfamethoxazole and ciprofloxacin. Both strains harbored abundant resistomes, inherent plasmids, chromosomal replicons and typical seven housekeeping genes (arc3, aroE4, glpF1, gmk4, pta4, tpi6, yqiL3). The most abundant putative virulomes were pathogenesis-associated proteins (included hemolysin gamma, leucocidins, proteases, staphylococcal superantigen/enterotoxin-like genes (Set/Ssl), capsule- and biofilm-associated genes, and hyaluronate lyase). Comparative phylogenomic analysis revealed the relatedness of the two clonal strains with prevalent MRSA-CC7 pathotypes observed in Italy (2013 and 2014), Denmark (2014), Thailand (2015 and 2016), USA (2018), and Nigeria (2016 and 2020); and share high genetic similarities with livestock strains from cow milk and cattle. Identified MRSA-CC7-ST789-t091-SCCmecV pathotypes implicated in SSTIs from Nigeria harboring repertoires of antibiotic resistance and virulence genes, and genetic relatedness with livestock strains; show the possibility of gene transfer between animal and human. Adequate hospital MRSA infection control and geno-epidemiological surveillance for animal and human transfer is required.
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Affiliation(s)
- Paul Akinniyi Akinduti
- Microbiology Unit, Department of Biological Sciences, Covenant University, Ota, Nigeria.
| | | | - El-Ashker Maged
- Department of Internal Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura, 35516, Egypt
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Sheykhsaran E, Abbasi A, Memar MY, Ghotaslou R, Baghi HB, Mazraeh FN, Laghousi D, Sadeghi J. The role of Staphylococcus aureus in cystic fibrosis pathogenesis and clinico-microbiological interactions. Diagn Microbiol Infect Dis 2024; 109:116294. [PMID: 38678689 DOI: 10.1016/j.diagmicrobio.2024.116294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Revised: 01/05/2024] [Accepted: 03/29/2024] [Indexed: 05/01/2024]
Abstract
Cystic fibrosis (CF) is a progressive and inherited disease that affects approximately 70000 individuals all over the world annually. A mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene serves as its defining feature. Bacterial infections have a significant impact on the occurrence and development of CF. In this manuscript, we discuss the role and virulence factors of Staphylococcus aureus as an important human pathogen with the ability to induce respiratory tract infections. Recent studies have reported S. aureus as the first isolated bacteria in CF patients. Methicillin-resistant Staphylococcus aureus (MRSA) pathogens are approximately resistant to all β-lactams. CF patients are colonized by MRSA expressing various virulence factors including toxins, and Staphylococcal Cassette Chromosome mec (SCCmec) types, and have the potential for biofilm formation. Therefore, variations in clinical outcomes will be manifested. SCCmec type II has been reported in CF patients more than in other SCCmec types from different countries. The small-colony variants (SCVs) as specific morphologic subtypes of S. aureus with slow growth and unusual properties can also contribute to persistent and difficult-to-treat infections in CF patients. The pathophysiology of SCVs is complicated and not fully understood. Patients with cystic fibrosis should be aware of the intrinsic risk factors for complex S. aureus infections, including recurring infections, physiological issues, or coinfection with P. aeruginosa.
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Affiliation(s)
- Elham Sheykhsaran
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran; Students' Research Committee, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Amin Abbasi
- Department of Food Science and Technology, National Nutrition and Food Technology Research Institute, Faculty of Nutrition Science and Food Technology, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Yousef Memar
- Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Ghotaslou
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Hossein Bannazadeh Baghi
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran; Infectious and Tropical Diseases Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fariba Naeimi Mazraeh
- Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Delara Laghousi
- Social Determinants of Health Research Center, Health Management and Safety Promotion Research Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Javid Sadeghi
- Immunology Research Centre, Tabriz University of Medical Sciences, Tabriz, Iran; Department of Microbiology, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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Naik P, Naik MN, Mishra DK, Joseph J. Methicillin resistance in Staphylococcus aureus modulates the transcriptome and disease pathology in a murine model of endophthalmitis. Exp Eye Res 2022; 218:109016. [DOI: 10.1016/j.exer.2022.109016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/05/2022] [Accepted: 02/24/2022] [Indexed: 11/16/2022]
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The History of Methicillin-Resistant Staphylococcus aureus in Brazil. ACTA ACUST UNITED AC 2020; 2020:1721936. [PMID: 33082892 PMCID: PMC7563066 DOI: 10.1155/2020/1721936] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 07/21/2020] [Accepted: 09/24/2020] [Indexed: 12/20/2022]
Abstract
Since the emergence of MRSA in the 1960s, a gradual increase in infections by resistant bacteria has been observed. Clinical manifestations may vary from brand to critical condition due to host risk factors, as well as pathogen virulence and resistance. The high adaptability and pathogenic profile of MRSA clones contributed to its spread in hospital and community settings. In Brazil, the first MRSA isolates were reported in the late 1980s, and since then different genetic profiles, such as the Brazilian epidemic clone (BEC) and other clones considered a pandemic, became endemic in the Brazilian population. Additionally, Brazil's MRSA clones were shown to be able to transfer genes involved in multidrug resistance and enhanced pathogenic properties. These events contributed to the rise of highly resistant and pathogenic MRSA. In this review, we present the main events which compose the history of MRSA in Brazil, including numbers and locations of isolation, as well as types of staphylococcal cassette chromosome mec (SCCmec) found in the Brazilian territory.
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Lupinacci FS, Bussius D, Acquesta F, Fam G, Rossi R, Navarini A, Mimica MJ. High prevalence of clindamycin resistance in Staphylococcus aureus blood culture isolates in São Paulo, Brazil. J Lab Physicians 2020; 9:314-316. [PMID: 28966497 PMCID: PMC5607764 DOI: 10.4103/jlp.jlp_161_16] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND: Clindamycin has become an important antimicrobial option for the treatment of Staphylococcus aureus. However, little is known about the current patterns of clindamycin-susceptibility in S. aureus invasive isolates, both in our country and in other developing countries in the world. AIMS: The aim of this study was to determine the prevalence of constitutive and inducible clindamycin resistance in methicillin-susceptible S. aureus (MSSA) and methicillin-resistant S. aureus (MRSA) blood culture isolates in São Paulo, Brazil. MATERIALS AND METHODS: From July 2011 to June 2012, all S. aureus isolates from blood cultures collected at our hospital were included in the study. Antimicrobial susceptibility testing was performed according to recommendations of the Clinical and Laboratory Standards Institute. RESULTS: Total prevalence of clindamycin resistance was 68%, including 7.2% with inducible resistance. In MRSA resistance rate was 90.8% whereas in MSSA the rate was 32.7%. CONCLUSIONS: Our high prevalence of clindamycin resistance highlights the importance of performing D-test in a routine base, as well of maintaining continued surveillance for the prevalence of clindamycin resistance.
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Affiliation(s)
- Felipe S Lupinacci
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
| | - Daniel Bussius
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
| | - Felipe Acquesta
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
| | - Gustavo Fam
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
| | - Raphael Rossi
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
| | - Alessandra Navarini
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
| | - Marcelo J Mimica
- Department of Pathology, Division of Microbiology, School of Medicine, Santa Casa de São Paulo, São Paulo, Brazil
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Molecular and Virulence Characteristics of Methicillin-Resistant Staphylococcus aureus Bacteria Recovered From Hospital Cockroaches. Jundishapur J Microbiol 2020. [DOI: 10.5812/jjm.98564] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Garbacz K, Piechowicz L, Podkowik M, Mroczkowska A, Empel J, Bania J. Emergence and spread of worldwide Staphylococcus aureus clones among cystic fibrosis patients. Infect Drug Resist 2018; 11:247-255. [PMID: 29503574 PMCID: PMC5826090 DOI: 10.2147/idr.s153427] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background The aim of this study was to assess the relatedness of molecular types of Staphylococcus aureus isolates colonizing cystic fibrosis (CF) patients with their antimicrobial resistance and prevalence of toxin genes. Methods A total of 215 isolates from the airways of 107 patients with CF were tested for spa and SCCmec type, antimicrobial resistance and carriage of toxin genes. Results t015, t084, t091, t700 and t002 were the largest group (approximately 25%) among all 69 identified spa types. Five new spa types, t14286, t14287, t14288, t14289 and t14290, were identified and registered. Isolates from CF patients were clustered into 11 multi-locus sequence typing clonal complexes, with CC30, CC22, CC97, CC45, CC15 and CC5 being the most frequent ones. Twelve (5.6%) methicillin-resistant S. aureus (MRSA) isolates and 102 (47.7%) multidrug-resistant isolates were identified, along with three SCCmec types (I, III and V). All isolates (both MRSA and methicillin-sensitive S. aureus) were Panton–Valentine leucocidin-negative, and 56.7% harbored egc genes. This was the first study documenting the presence of ST398-V-t571 livestock-associated MRSA in a European patient with CF. Conclusion These findings imply that individuals with CF can also be colonized with animal-related ST398 MRSA, and justify constant monitoring of staphylococcal colonization and identification of epidemic S. aureus clones in this group.
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Affiliation(s)
- Katarzyna Garbacz
- Department of Oral Microbiology, Medical University of Gdansk, Gdansk, Poland
| | - Lidia Piechowicz
- Department of Medical Microbiology, Medical University of Gdansk, Gdansk, Poland
| | - Magdalena Podkowik
- Department of Food Hygiene and Consumer Health Protection, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland
| | - Aneta Mroczkowska
- Department of Epidemiology and Clinical Microbiology, National Medicines Institute, Warsaw, Poland
| | - Joanna Empel
- Department of Epidemiology and Clinical Microbiology, National Medicines Institute, Warsaw, Poland
| | - Jacek Bania
- Department of Food Hygiene and Consumer Health Protection, Wroclaw University of Environmental and Life Sciences, Wroclaw, Poland
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Spinardi JR, Berea R, Orioli PA, Gabriele MM, Navarini A, Marques MT, Neto MN, Mimica MJ. Enterococcus spp. and S. aureus colonization in neutropenic febrile children with cancer. Germs 2017. [PMID: 28626736 DOI: 10.18683/germs.2017.1110] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
INTRODUCTION Febrile neutropenia is one of the most serious treatment-related complications in cancer patients. Susceptible to rapidly progressing infections, which result in prolonged hospitalization and use of broad-spectrum antibiotics, neutropenic patients are subject to colonization by multiresistant agents, which enhances the risk of infections. METHODS In this study we included samples collected with nasal, oropharyngeal and anal swabs from hospitalized children with febrile neutropenia following chemotherapy, between March 2014 and 2015, aiming to elucidate colonization by S. aureus and Enterococcus spp., as well as their resistance profile. RESULTS S. aureus was found in 22% of the patients and 14% of the events. Methicillin-resistant S. aureus colonized 13.6% of patients. Including anal swabs in the screening increased the identification of colonized patients by 20%. Enterococcus spp. was found in 27% of patients and 17% of episodes. Enterococcal isolates resistant to vancomycin, accounting for 25% of the total, were not isolated in anal swabs at any time, with the oropharyngeal site being much more important. The rate of infection by Enterococcus spp. was 4.5% of all patients and 16% among the colonized patients. CONCLUSION Especially in this population, colonization studies including more sites can yield a higher chance of positive results. Establishing the colonization profile in febrile neutropenic children following chemotherapy may help to institute an empirical antibiotic treatment aimed at antibiotic adequacy and lower induction of resistance, thereby decreasing the risk of an unfavorable clinical outcome.
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Affiliation(s)
- Julia R Spinardi
- MD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Rodrigo Berea
- MD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Patricia A Orioli
- MD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Marina M Gabriele
- MD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Alessandra Navarini
- PhD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Marina T Marques
- MD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Milton N Neto
- MD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
| | - Marcelo J Mimica
- MD, PhD, Department of Pathology (Division of Microbiology), Santa Casa de São Paulo School of Medicine, Rua Dr Cesario Mota Junior 61, São Paulo, SP, Brazil
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Okado JB, Bogni SC, Reinato LAF, Martinez R, Gir E, Camargo ILBDC. Molecular analysis of methicillin-resistant Staphylococcus aureus dissemination among healthcare professionals and/or HIV patients from a tertiary hospital. Rev Soc Bras Med Trop 2017; 49:51-6. [PMID: 27163564 DOI: 10.1590/0037-8682-0284-2015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 01/27/2016] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION Methicillin-resistant Staphylococcus aureus (MRSA) is a nosocomial pathogen in community settings. MRSA colonized individuals may contribute to its dissemination; the risk of MRSA infection is increased in human immunodeficiency virus/acquired immune deficiency syndrome (HIV/AIDS) patients, although the prevalence of colonization in this group is not well established. The present study addressed this issue by characterizing MRSA isolates from HIV/AIDS patients and their healthcare providers (HCPs) to determine whether transmission occurred between these two populations. METHODS A total of 24 MRSA isolates from HIV-infected patients and five from HCPs were collected between August 2011 and May 2013. Susceptibility to currently available antimicrobials was determined. Epidemiological typing was carried out by pulsed-field gel electrophoresis, multilocus sequence typing, and Staphylococcus cassette chromosome (SCCmec) typing. The presence of heterogeneous vancomycin-intermediate Staphylococcus aureus (hVISA) and heterogeneous daptomycin-resistant Staphylococcus aureus (hDRSA) was confirmed by population analysis profile. Isolates characterized in this study were also compared to isolates from 2009 obtained from patients at the same hospital. RESULTS A variety of lineages were found among patients, including ST5-SCCmecII and ST30-SCCmecIV. Two isolates were Panton-Valentine leukocidin-positive, and hVISA and hDRSA were detected. MRSA isolates from two HCPs were not related to those from HIV/AIDS patients, but clustered with archived MRSA from 2009 with no known relationship to the current study population. CONCLUSIONS ST105-SCCmecII clones that colonized professionals in 2011 and 2012 were already circulating among patients in 2009, but there is no evidence that these clones spread to or between HIV/AIDS patients up to the 7th day of their hospitalization.
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Affiliation(s)
- Jessica Baleiro Okado
- Programa de Pós-Graduação Strictu Sensu em Ciências-Opção Biomolecular, Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - Simoni Camila Bogni
- Laboratório de Epidemiologia e Microbiologia Molecular (LEMiMo), Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brazil
| | - Lílian Andreia Fleck Reinato
- Programa de Pós-Graduação Strictu Sensu em Enfermagem, Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Roberto Martinez
- Escola de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Elucir Gir
- Escola de Enfermagem de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Ilana Lopes Baratella da Cunha Camargo
- Laboratório de Epidemiologia e Microbiologia Molecular (LEMiMo), Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo, Brazil
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Brust T, da Costa TM, Amorim JC, Asensi MD, Fernandes O, Aguiar-Alves F. Hospital-associated methicillin-resistant Staphylococcus aureus carrying the PVL gene outbreak in a Public Hospital in Rio de Janeiro, Brazil. Braz J Microbiol 2014; 44:865-8. [PMID: 24516453 PMCID: PMC3910202 DOI: 10.1590/s1517-83822013000300031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Accepted: 11/13/2012] [Indexed: 12/01/2022] Open
Abstract
Hospital associated methicillin-resist Staphylococcus aureus has long been associated to outbreaks in the hospital environment. In this work, we investigated an outbreak of Hospital associated methicillin-resist Staphylococcus aureus carrying the Panton-Valentine leukocidin gene, which occurred in a large community hospital in Rio de Janeiro, Brazil.
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Affiliation(s)
- Társis Brust
- Laboratório Interdisciplinar de Pesquisas Médicas, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Thaina Miranda da Costa
- Programa de Pós-Graduação em Patologia, Faculdade de Medicina, Universidade Federal Fluminense, Niterói, RJ, Brazil
| | - José Carlos Amorim
- Laboratório Interdisciplinar de Pesquisas Médicas, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Marise Dutra Asensi
- Laboratório de Pesquisa de Infecção Hospitalar, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Octavio Fernandes
- Laboratório Interdisciplinar de Pesquisas Médicas, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Fábio Aguiar-Alves
- Programa de Pós-Graduação em Patologia, Faculdade de Medicina, Universidade Federal Fluminense, Niterói, RJ, Brazil. ; Polo Universitário de Nova Friburgo, Universidade Federal Fluminense, Nova Friburgo, RJ, Brazil
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Pereira MFB, Berezin EN, Carvalho RL, Scheffer DK, Mimica MJ. Mupirocin susceptibility in Staphylococcus aureus nasal and oropharyngeal isolates from Brazilian children. J Chemother 2013; 26:373-4. [PMID: 24621161 DOI: 10.1179/1973947813y.0000000151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Mupirocin is a topical antimicrobial agent and part of most Staphylococcus aureus decolonization regimens. Thus, knowing the mupirocin susceptibility profile of colonizing S. aureus is paramount for the proper use of this agent. We evaluated S. aureus isolates from 128 colonized children, using disc diffusion (with 5 mcg and 200 mcg discs) and Etest. None were low-level or high-level mupirocin-resistant. Since mupirocin will be increasingly needed for the control of S. aureus infection, continuous monitoring of its susceptibility status is necessary.
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Jiménez JN, Ocampo AM, Vanegas JM, Rodríguez EA, Garcés CG, Patiño LA, Ospina S, Correa MM. Characterisation of virulence genes in methicillin susceptible and resistant Staphylococcus aureus isolates from a paediatric population in a university hospital of Medellín, Colombia. Mem Inst Oswaldo Cruz 2012; 106:980-5. [PMID: 22241120 DOI: 10.1590/s0074-02762011000800013] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Accepted: 08/31/2011] [Indexed: 11/22/2022] Open
Abstract
Virulence and antibiotic resistance are significant determinants of the types of infections caused by Staphylococcus aureus and paediatric groups remain among the most commonly affected populations. The goal of this study was to characterise virulence genes of methicillin-susceptible S. aureus (MSSA) and methicillin-resistant S. aureus (MRSA) strains isolated from a paediatric population of a Colombian University Hospital during 2009. Sixty MSSA and MRSA isolates were obtained from paediatric patients between zero-14 years. We identified the genes encoding virulence factors, which included Panton-Valentine leucocidine (PVL), staphylococcal enterotoxins A-E, exfoliative toxins A and B and toxic shock syndrome toxin 1. Typing of the staphylococcal chromosome cassette mec (SCCmec) was performed in MRSA strains. The virulence genes were more diverse and frequent in MSSA than in MRSA isolates (83% vs. 73%). MRSA strains harboured SCCmec types IVc (60%), I (30%), IVa (7%) and V (3%). SCCmec type IVc isolates frequently carried the PVL encoding genes and harboured virulence determinants resembling susceptible strains while SCCmec type I isolates were often negative. PVL was not exclusive to skin and soft tissue infections. As previously suggested, these differences in the distribution of virulence factor genes may be due to the fitness cost associated with methicillin resistance.
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Staphylococcus aureus and cystic fibrosis. J Cyst Fibros 2012; 11:71. [DOI: 10.1016/j.jcf.2011.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Accepted: 08/01/2011] [Indexed: 11/21/2022]
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Bádue Pereira MF, Mimica MJ, de Lima Bigelli Carvalho R, Scheffer DK, Berezin EN. High rate of Staphylococcus aureus oropharyngeal colonization in children. J Infect 2011; 64:338-40. [PMID: 22155659 DOI: 10.1016/j.jinf.2011.11.025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 11/26/2011] [Accepted: 11/28/2011] [Indexed: 11/17/2022]
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Current World Literature. Curr Opin Pulm Med 2011; 17:484-8. [DOI: 10.1097/mcp.0b013e32834c7beb] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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