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Thornton CS, Parkins MD. Microbial Epidemiology of the Cystic Fibrosis Airways: Past, Present, and Future. Semin Respir Crit Care Med 2023; 44:269-286. [PMID: 36623820 DOI: 10.1055/s-0042-1758732] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Progressive obstructive lung disease secondary to chronic airway infection, coupled with impaired host immunity, is the leading cause of morbidity and mortality in cystic fibrosis (CF). Classical pathogens found in the airways of persons with CF (pwCF) include Pseudomonas aeruginosa, Staphylococcus aureus, the Burkholderia cepacia complex, Achromobacter species, and Haemophilus influenzae. While traditional respiratory-tract surveillance culturing has focused on this limited range of pathogens, the use of both comprehensive culture and culture-independent molecular approaches have demonstrated complex highly personalized microbial communities. Loss of bacterial community diversity and richness, counteracted with relative increases in dominant taxa by traditional CF pathogens such as Burkholderia or Pseudomonas, have long been considered the hallmark of disease progression. Acquisition of these classic pathogens is viewed as a harbinger of advanced disease and postulated to be driven in part by recurrent and frequent antibiotic exposure driven by frequent acute pulmonary exacerbations. Recently, CF transmembrane conductance regulator (CFTR) modulators, small molecules designed to potentiate or restore diminished protein levels/function, have been successfully developed and have profoundly influenced disease course. Despite the multitude of clinical benefits, structural lung damage and consequent chronic airway infection persist in pwCF. In this article, we review the microbial epidemiology of pwCF, focus on our evolving understanding of these infections in the era of modulators, and identify future challenges in infection surveillance and clinical management.
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Affiliation(s)
- Christina S Thornton
- Department of Medicine, Cumming School of Medicine, University of Calgary, Alberta, Canada
| | - Michael D Parkins
- Department of Medicine, Cumming School of Medicine, University of Calgary, Alberta, Canada.,Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Alberta, Canada
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Mixed Populations and Co-Infection: Pseudomonas aeruginosa and Staphylococcus aureus. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1386:397-424. [DOI: 10.1007/978-3-031-08491-1_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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3
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Rumpf C, Lange J, Schwartbeck B, Kahl BC. Staphylococcus aureus and Cystic Fibrosis-A Close Relationship. What Can We Learn from Sequencing Studies? Pathogens 2021; 10:pathogens10091177. [PMID: 34578208 PMCID: PMC8466686 DOI: 10.3390/pathogens10091177] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/07/2021] [Accepted: 09/08/2021] [Indexed: 01/13/2023] Open
Abstract
Staphylococcus aureus is next to Pseudomonas aeruginosa the most isolated pathogen from the airways of cystic fibrosis (CF) patients, who are often infected by a dominant S. aureus clone for extended periods. To be able to persist, the pathogen has to adapt to the hostile niche of the airways to counteract host defence, antibiotic therapy and the competition with coinfecting pathogens. S. aureus is equipped with many virulence factors including adhesins, toxins that are localized on the chromosome, on plasmids or are phage-related. S. aureus is especially versatile and adaptation and evolution of the pathogen occurs by the acquisition of new genes by horizontal gene transfer (HGT), changes in nucleotides (single nucleotide variations, SNVs) that can cause a selective advantage for the bacteria and become fixed in subpopulations. Methicillin-resistant S. aureus are a special threat to CF patients due to the more severe lung disease occurring in infected patients. Today, with decreasing costs for sequencing, more and more studies using S. aureus isolates cultured from CF patients are being published, which use whole genome sequencing (WGS), multilocus sequence typing (MLST) or spa-sequence typing (spa-typing) to follow the population dynamics of S. aureus, elucidate the underlying mechanisms of phenotypic variants, newly acquired resistance or adaptation to the host response in this particular niche. In the first part of this review, an introduction to the genetic make-up and the pathogenesis of S. aureus with respect to CF is provided. The second part presents an overview of recent studies and their findings using genotypic methods such as single or multilocus sequencing and whole genome sequencing, which identify factors contributing to the adaptation of S. aureus and its evolution in the airways of individuals with CF.
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Cystic Fibrosis: Recent Insights into Inhaled Antibiotic Treatment and Future Perspectives. Antibiotics (Basel) 2021; 10:antibiotics10030338. [PMID: 33810116 PMCID: PMC8004710 DOI: 10.3390/antibiotics10030338] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 03/16/2021] [Accepted: 03/17/2021] [Indexed: 02/08/2023] Open
Abstract
Although new inhaled antibiotics have profoundly improved respiratory diseases in cystic fibrosis (CF) patients, lung infections are still the leading cause of death. Inhaled antibiotics, i.e., colistin, tobramycin, aztreonam lysine and levofloxacin, are used as maintenance treatment for CF patients after the development of chronic Pseudomonas aeruginosa (P. aeruginosa) infection. Their use offers advantages over systemic therapy since a relatively high concentration of the drug is delivered directly to the lung, thus, enhancing the pharmacokinetic/pharmacodynamic parameters and decreasing toxicity. Notably, alternating treatment with inhaled antibiotics represents an important strategy for improving patient outcomes. The prevalence of CF patients receiving continuous inhaled antibiotic regimens with different combinations of the anti-P. aeruginosa antibiotic class has been increasing over time. Moreover, these antimicrobial agents are also used for preventing acute pulmonary exacerbations in CF. In this review, the efficacy and safety of the currently available inhaled antibiotics for lung infection treatment in CF patients are discussed, with a particular focus on strategies for eradicating P. aeruginosa and other pathogens. Moreover, the effects of long-term inhaled antibiotic therapy for chronic P. aeruginosa infection and for the prevention of pulmonary exacerbations is reviewed. Finally, how the mucus environment and microbial community richness can influence the efficacy of aerosolized antimicrobial agents is discussed.
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Varela MC, Roch M, Taglialegna A, Long SW, Saavedra MO, Rose WE, Davis JJ, Hoffman LR, Hernandez RE, Rosato RR, Rosato AE. Carbapenems drive the collateral resistance to ceftaroline in cystic fibrosis patients with MRSA. Commun Biol 2020; 3:599. [PMID: 33093601 PMCID: PMC7582194 DOI: 10.1038/s42003-020-01313-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 07/30/2020] [Indexed: 01/14/2023] Open
Abstract
Chronic airways infection with methicillin-resistant Staphylococcus aureus (MRSA) is associated with worse respiratory disease cystic fibrosis (CF) patients. Ceftaroline is a cephalosporin that inhibits the penicillin-binding protein (PBP2a) uniquely produced by MRSA. We analyzed 335 S. aureus isolates from CF sputum samples collected at three US centers between 2015-2018. Molecular relationships demonstrated that high-level resistance of preceding isolates to carbapenems were associated with subsequent isolation of ceftaroline resistant CF MRSA. In vitro evolution experiments showed that pre-exposure of CF MRSA to meropenem with further selection with ceftaroline implied mutations in mecA and additional mutations in pbp1 and pbp2, targets of carbapenems; no effects were achieved by other β-lactams. An in vivo pneumonia mouse model showed the potential therapeutic efficacy of ceftaroline/meropenem combination against ceftaroline-resistant CF MRSA infections. Thus, the present findings highlight risk factors and potential therapeutic strategies offering an opportunity to both prevent and address antibiotic resistance in this patient population.
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Affiliation(s)
- Maria Celeste Varela
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, TX, USA
| | - Melanie Roch
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, TX, USA
| | - Agustina Taglialegna
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, TX, USA
| | - Scott W Long
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, TX, USA
| | - Matthew Ojeda Saavedra
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, TX, USA
| | - Warren E Rose
- School of Pharmacy, University of Wisconsin-Madison, Madison, WI, USA
| | - James J Davis
- Argonne National Laboratory (DOE), Lemont, IL, USA
- Computation Institute, University of Chicago, Chicago, IL, USA
| | - Lucas R Hoffman
- Department of Pediatrics and Department of Microbiology, University of Washington, Seattle, WA, USA
- Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Rafael E Hernandez
- Department of Pediatrics and Department of Microbiology, University of Washington, Seattle, WA, USA
- Center for Clinical and Translational Research, Seattle Children's Research Institute, Seattle, WA, USA
| | - Roberto R Rosato
- Houston Methodist Cancer Center, Houston Methodist Hospital, Houston, USA
| | - Adriana E Rosato
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, TX, USA.
- Riverside University Health System-Medical Center, 26520 Cactus Avenue, Moreno Valley, CA, 92555, USA.
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Emergence and Within-Host Genetic Evolution of Methicillin-Resistant Staphylococcus aureus Resistant to Linezolid in a Cystic Fibrosis Patient. Antimicrob Agents Chemother 2018; 62:AAC.00720-18. [PMID: 30275089 DOI: 10.1128/aac.00720-18] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Accepted: 09/22/2018] [Indexed: 12/26/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) infection has increased in recent years among cystic fibrosis (CF) patients. Linezolid (LZD) is one of the antistaphylococcal antibiotics widely used in this context. Although LZD resistance is rare, it has been described as often associated with long-term treatments. Thirteen MRSA strains isolated over 5 years from one CF patient were studied for LZD resistance emergence and subjected to whole-genome sequencing (WGS). Resistance emerged after three 15-day LZD therapeutic regimens over 4 months. It was associated with the mutation of G to T at position 2576 (G2576T) in all 5 rrl copies, along with a very high MIC (>256 mg/liter) and a strong increase in the generation time. Resistant strains isolated during the ensuing LZD therapeutic regimens and until 13 months after LZD stopped harbored only 3 or 4 mutated rrl copies, associated with lower MICs (8 to 32 mg/liter) and low to moderate generation time increases. Despite these differences, whole-genome sequencing allowed us to determine that all isolates, including the susceptible one isolated before LZD treatment, belonged to the same lineage. In conclusion, LZD resistance can emerge rapidly in CF patients and persist without linezolid selective pressure in colonizing MRSA strains belonging to the same lineage.
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Stockmann C, Olson J, Rashid J, Lubsch L, Young DC, Hersh AL, Frymoyer A, Ampofo K, Liu X, Wang Y, Sherwin CMT, Zobell JT. An Evaluation of Vancomycin Area Under the Curve Estimation Methods for Children Treated for Acute Pulmonary Exacerbations of Cystic Fibrosis Due to Methicillin-Resistant Staphylococcus aureus. J Clin Pharmacol 2018; 59:198-205. [PMID: 30371946 DOI: 10.1002/jcph.1323] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 09/14/2018] [Indexed: 11/12/2022]
Abstract
The prevalence of pulmonary methicillin-resistant Staphylococcus aureus infections in patients with cystic fibrosis (CF) has increased over the last 2 decades. Two concentrations-a postdistributive and a trough-are currently used to estimate the area under the curve (AUC) of vancomycin, an antibiotic routinely used to treat these infections, to achieve the target AUC/minimum inhibitory concentration of ≥400 mg·h/L in ensuring optimal dosing of this drug. This study evaluated precision and bias in estimating vancomycin AUCs obtained either from a population pharmacokinetic (PK) model by using a single trough concentration or from standard PK equation-based 2-point monitoring approach. AUCs were either obtained from a single trough concentration-fitted model or derived from a model fitted by 2 concentration points. Children ≥2 years of age with CF received intravenous vancomycin at 2 centers from June 2012 to December 2014. A population PK model was developed in Pmetrics to quantify the between-subject variability in vancomycin PK parameters, define the sources of PK variability, and leverage information from the population to improve individual AUC estimates. Twenty-three children with CF received 27 courses of vancomycin. The median age was 12.3 (interquartile range [IQR] 8.5-16.6) years. From the individual vancomycin PK parameter estimates from the population PK model, median AUC was 622 (IQR 529-680) mg·h/L. Values were not significantly different from the AUC calculated using the standard PK equation-based approach (median 616 [IQR 540-663] mg·h/L) (P = .89). A standard PK equation-based approach using 2 concentrations and a population PK model-based approach using a single trough concentration yielded unbiased and precise AUC estimates. Findings suggest that options exist to implement AUC-based pediatric vancomycin dosing in patients with CF. The findings of this study reveal that several excellent options exist for centers to implement AUC-based pediatric vancomycin dosing for patients with CF.
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Affiliation(s)
- Chris Stockmann
- Division of Clinical Pharmacology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA.,University of Utah College of Pharmacy, Salt Lake City, UT, USA.,Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Jared Olson
- Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA.,Department of Pharmacy, Intermountain Primary Children's Hospital, Salt Lake City, UT, USA
| | - Jahidur Rashid
- Division of Clinical Pharmacology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Lisa Lubsch
- School of Pharmacy, Southern Illinois University Edwardsville, Edwardsville, IL, USA
| | - David C Young
- University of Utah College of Pharmacy, Salt Lake City, UT, USA.,University of Utah Adult Cystic Fibrosis Center, Salt Lake City, UT, USA
| | - Adam L Hersh
- Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Adam Frymoyer
- Department of Pediatrics, Stanford University, Palo Alto, CA, USA
| | - Krow Ampofo
- Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Xiaoxi Liu
- Division of Clinical Pharmacology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Yuhuan Wang
- Division of Clinical Pharmacology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA
| | - Catherine M T Sherwin
- Division of Clinical Pharmacology, Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, UT, USA.,University of Utah College of Pharmacy, Salt Lake City, UT, USA
| | - Jeffery T Zobell
- University of Utah College of Pharmacy, Salt Lake City, UT, USA.,Department of Pharmacy, Intermountain Primary Children's Hospital, Salt Lake City, UT, USA.,Intermountain Cystic Fibrosis Pediatric Center, Salt Lake City, UT, USA
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Roch M, Varela MC, Taglialegna A, Rose WE, Rosato AE. Activity of Telavancin against Staphylococcus aureus Isolates, Including Those with Decreased Susceptibility to Ceftaroline, from Cystic Fibrosis Patients. Antimicrob Agents Chemother 2018; 62:e00956-18. [PMID: 29914961 PMCID: PMC6125506 DOI: 10.1128/aac.00956-18] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 06/13/2018] [Indexed: 11/21/2022] Open
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) acquisition in cystic fibrosis (CF) patients confers a clinical outcome worse than that in non-CF patients with an increased rate of declined lung function. Telavancin, an approved lipoglycopeptide used to treat infections due to S. aureus, has a dual mode of action causing inhibition of peptidoglycan synthesis and membrane depolarization. MRSA infections in CF patients remain an important problem with no foreseeable decline in prevalence rates. Although telavancin is currently in clinical use for the treatment of complicated skin infections and hospital-acquired pneumonia, the activity against S. aureus infections in CF patients has not been investigated. In this work, we studied the activity of telavancin against CF patient-derived S. aureus strains collected from geographically diverse CF centers in the United States. We found that the telavancin MIC90 was 0.06 μg/ml, 8-fold lower than the ceftaroline or daptomycin MIC90 and 25-fold lower than the linezolid and vancomycin MIC90 We demonstrate that telavancin at serum free concentrations has rapid bactericidal activity, with a decrease of more than 3 log10 CFU/ml being achieved during the first 4 to 6 h of treatment, performing better in this assay than vancomycin and ceftaroline, including against S. aureus strains resistant to ceftaroline. Telavancin resistance was infrequent (0.3%), although we found that it can occur in vitro in both CF- and non-CF patient-derived S. aureus strains by progressive passages with subinhibitory concentrations. Genetic analysis of telavancin-resistant in vitro mutants showed gene polymorphisms in cell wall and virulence genes and increased survival in a Galleria mellonella infection model. Thus, we conclude that telavancin represents a promising therapeutic option for infections in CF patients with potent in vitro activity and a low resistance development potential.
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Affiliation(s)
- Melanie Roch
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, Texas, USA
| | - Maria Celeste Varela
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, Texas, USA
| | - Agustina Taglialegna
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, Texas, USA
| | - Warren E Rose
- School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Adriana E Rosato
- Department of Pathology and Genomic Medicine, Center for Molecular and Translational Human Infectious Diseases Research, Houston Methodist Research Institute, Houston, Texas, USA
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Schwerdt M, Neumann C, Schwartbeck B, Kampmeier S, Herzog S, Görlich D, Dübbers A, Große-Onnebrink J, Kessler C, Küster P, Schültingkemper H, Treffon J, Peters G, Kahl BC. Staphylococcus aureus in the airways of cystic fibrosis patients - A retrospective long-term study. Int J Med Microbiol 2018; 308:631-639. [PMID: 29501453 DOI: 10.1016/j.ijmm.2018.02.003] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 02/13/2018] [Accepted: 02/20/2018] [Indexed: 10/18/2022] Open
Abstract
BACKGROUND Cystic fibrosis (CF) is an autosomal recessive disease associated with chronic airway infections by Staphylococcus aureus as one of the earliest and most prevalent pathogens. We conducted a retrospective study to determine the S. aureus infection status of CF patients treated since 1994 at two certified CF-centres in Münster, Germany, to get insights into the dynamics of S. aureus airway infection and the clinical impact on lung function on a long-term perspective. MATERIALS AND METHODS We used data from our microbiological database collected between 1994 and 2016 for patients treated at two centres in Münster, Germany, respectively, to determine the infection status for S. aureus. Furthermore, the resistance to selected antibiotics was determined for all patients' isolates and for 15 patients on a longitudinal basis. In addition, the prevalence of adaptive phenotypes such as small colony variants (SCVs) and mucoid S. aureus was assessed. RESULTS For this study, 2867 patient years with respiratory specimens (mean of 9.3 years for every patient, range 1-22 years) were evaluated for 283 CF patients (median age of 7 years at the beginning of the observation period, range 0-57 years, 51% male). 18% of patients were rarely infected by S. aureus (≤24% of observation years), 20% of patients intermittently (25-49%) and 61% persistently (≥50% of observation period). Susceptibility testing for 12969 S. aureus isolates resulted in resistance to methicillin in 9%, trimethoprim/sulfamethoxazole in 10%, levofloxacin in 14%, gentamicin in 20%, erythromycin and/or clindamycin in 30% and penicillin in 80% of all isolates. S. aureus isolates of 15 patients revealed dynamics of resistance with increase, decrease and loss of resistant isolates to the analysed antibiotics during the study period. SCVs were isolated at least once from 42% (n = 118) of patients and mucoid isolates from 2% (n = 7) of patients. In the last study year, 89 patients were infected by S. aureus only, 44 patients by S. aureus and Pseudomonas aeruginosa and 18 by P. aeruginosa only. Patients infected by S. aureus only were younger and had better lung function compared to the other two groups. CONCLUSIONS We determined a high percentage of patients with persistent S. aureus infection. During persistence, mostly fluctuation of resistance against various antibiotics was observed in the isolates indicating acquisition and loss of resistance genes by S. aureus. The prevalence of adaptive phenotypes during long-term persistence was high for SCVs (42% of patients), but low for mucoid isolates (2% of patients), which might be underestimated for mucoid phenotypes due to the retrospective study design and the difficulty to detect mucoid isolates in primary cultures. While patients with S. aureus only had better lung function and were younger, no difference was found between the group of P. aeruginosa and S. aureus co-infection and P. aeruginosa only with previous S. aureus infection.
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Affiliation(s)
- Mathias Schwerdt
- Institute of Medical Microbiology, University Hospital Münster, Germany
| | - Claudia Neumann
- Institute of Medical Microbiology, University Hospital Münster, Germany
| | | | | | - Susann Herzog
- Institute of Medical Microbiology, University Hospital Münster, Germany
| | - Dennis Görlich
- Institute of Biostatistics and Clinical Research, University Hospital Münster, Germany
| | | | | | | | - Peter Küster
- Department of Pediatrics, Clemenshospital, Münster, Germany
| | | | - Janina Treffon
- Institute of Medical Microbiology, University Hospital Münster, Germany
| | - Georg Peters
- Institute of Medical Microbiology, University Hospital Münster, Germany
| | - Barbara C Kahl
- Institute of Medical Microbiology, University Hospital Münster, Germany.
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Kiefer A, Bogdan C, Melichar VO. Successful eradication of newly acquired MRSA in six of seven patients with cystic fibrosis applying a short-term local and systemic antibiotic scheme. BMC Pulm Med 2018; 18:20. [PMID: 29370836 PMCID: PMC5785857 DOI: 10.1186/s12890-018-0588-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 01/15/2018] [Indexed: 11/20/2022] Open
Abstract
Background In individuals with cystic fibrosis (CF), colonization with methicillin-resistant Staphylococcus aureus (MRSA) was reported to be associated with a deterioration of pulmonary disease as reflected by an accelerated decline in lung function. Thus, an early eradication of MRSA could be beneficial in these patients. Here, we report on an intensified MRSA eradication protocol. Methods Since 2012 a protocol for the eradication of newly acquired MRSA has been used in our CF Clinic, combining oral rifampicin and fusidic acid, inhaled vancomycin, nasal mupirocin, local antiseptic treatment and hygienic directives all of which are applied for only 7 days during an inpatient hospital stay. Results Since 2012 seven patients (3 male, 4 female; age range 4 to 30 years) newly acquired MRSA. In 6 of the 7 patients (86%) successful eradication of MRSA was achieved upon first treatment using the protocol described above. In one patient a second course of treatment was performed which, however, also failed to eliminate the colonizing MRSA. Conclusions Our protocol led to an eradication rate of 86%. The impact of each individual component of the protocol remains to be determined.
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Affiliation(s)
- Alexander Kiefer
- Department of Pediatrics and Adolescent Medicine, Clinic for Cystic Fibrosis, Universitätsklinikum Erlangen, Loschgestraße 15, 91054, Erlangen, Germany.
| | - Christian Bogdan
- Microbiology Institute - Clinical Microbiology, Immunology and Hygiene, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Wasserturmstraße 3/5, 91054, Erlangen, Germany
| | - Volker O Melichar
- Department of Pediatrics and Adolescent Medicine, Clinic for Cystic Fibrosis, Universitätsklinikum Erlangen, Loschgestraße 15, 91054, Erlangen, Germany
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11
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Cohen RWF, Folescu TW, Daltro P, Boechat MCB, Lima DF, Marques EA, Leão RS. Methicillin-resistant Staphylococcus aureus in cystic fibrosis patients: do we need to care? A cohort study. SAO PAULO MED J 2017; 135:420-427. [PMID: 28832807 PMCID: PMC10027246 DOI: 10.1590/1516-3180.2016.0350240317] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Accepted: 03/24/2017] [Indexed: 11/22/2022] Open
Abstract
CONTEXT AND OBJECTIVE The prevalence of a variety of potentially pathogenic microorganisms in cystic fibrosis patients, such as methicillin-resistant Staphylococcus aureus (MRSA), has increased over the past decade. Given the increasing prevalence of MRSA and the few data available in the literature, better understanding of the clinical repercussions of colonization by this bacterium in cystic fibrosis patients becomes essential. This study aimed to evaluate the repercussions of chronic colonization by MRSA in cystic fibrosis patients. DESIGN AND SETTING Retrospective cohort study from January 2004 to December 2013 in a cystic fibrosis reference center. METHODS Each patient with cystic fibrosis was evaluated for nutritional status (body mass index, BMI, and BMI percentile), pulmonary function and tomographic abnormalities (modified Bhalla scores) at the time of chronic colonization by MRSA or methicillin-susceptible Staphylococcus aureus (MSSA) and throughout the study period. RESULTS Twenty pairs of patients were included. There were no significant differences between the groups regarding nutritional characteristics. Spirometric data showed a trend towards greater obstruction of the airways in patients with MRSA. Patients with MRSA presented greater structural damage to their lungs, demonstrated not only by the total Bhalla score but also by its parameters individually. CONCLUSIONS Patients colonized by MRSA presented greater functional and structural respiratory impairment at the time of chronic colonization. Disease progression was also faster in patients chronically colonized by MRSA than in those with MSSA. This was shown through comparisons that avoided possible confounding variables.
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Affiliation(s)
- Renata Wrobel Folescu Cohen
- Assistant Professor of Pediatrics, School of Medical Sciences, Universidade do Estado do Rio de Janeiro (UERJ), and Pediatric Pulmonologist, Instituto Nacional de Saúde da Mulher da Criança e do Adolescente Fernandes Figueira, Fundação Instituto Oswaldo Cruz (IFF/Fiocruz), Rio de Janeiro (RJ), Brazil.
| | - Tânia Wrobel Folescu
- Head of Pediatric Pulmonology, Instituto Nacional de Saúde da Mulher da Criança e do Adolescente Fernandes Figueira, Fundação Instituto Oswaldo Cruz (IFF/Fiocruz), Rio de Janeiro (RJ), Brazil.
| | - Pedro Daltro
- Radiologist, Instituto Nacional de Saúde da Mulher da Criança e do Adolescente Fernandes Figueira, Fundação Instituto Oswaldo Cruz (IFF/Fiocruz), Rio de Janeiro (RJ), Brazil.
| | - Marcia Cristina Bastos Boechat
- Head of Radiology, Instituto Nacional de Saúde da Mulher da Criança e do Adolescente Fernandes Figueira, Fundação Instituto Oswaldo Cruz (IFF/Fiocruz), Rio de Janeiro (RJ), Brazil.
| | - Danielle Ferreira Lima
- Fellow, Department of Microbiology, Immunology and Parasitology, School of Medical Sciences, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro (RJ), Brazil.
| | - Elizabeth Andrade Marques
- Professor, Department of Microbiology, Immunology and Parasitology, School of Medical Sciences, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro (RJ), Brazil.
| | - Robson Souza Leão
- Professor, Department of Microbiology, Immunology and Parasitology, School of Medical Sciences, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro (RJ), Brazil.
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12
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Gur M, Spinelli E, Tridello G, Baltieri S, Pinali L, Montemezzi S, Bentur L, Assael BM. Chest computed tomography scores in patients with cystic fibrosis colonized with methicillin-resistant Staphylococcus aureus. CLINICAL RESPIRATORY JOURNAL 2017; 12:779-785. [DOI: 10.1111/crj.12594] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Revised: 11/02/2016] [Accepted: 11/23/2016] [Indexed: 11/27/2022]
Affiliation(s)
- Michal Gur
- Centro Regionale Fibrosi Cistica; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
| | - Elena Spinelli
- Centro Regionale Fibrosi Cistica; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
| | - Gloria Tridello
- Centro Regionale Fibrosi Cistica; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
| | - Susanna Baltieri
- Unità operativa di Radiologia; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
| | - Lucia Pinali
- Unità operativa di Radiologia; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
| | - Stefania Montemezzi
- Unità operativa di Radiologia; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
| | - Lea Bentur
- Ruth Rappaport Children's Hospital; Pediatric Pulmonary Institute and CF Center; Haifa Israel
- The Rappaport Faculty of Medicine; Technion-Israel Institute of Technology Haifa; Haifa Israel
| | - Baroukh Maurice Assael
- Centro Regionale Fibrosi Cistica; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
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Bittencourt PH, Pimentel CSS, Bonfim BS, Marostica PJ, Souza EL. Incidence and treatment of methicillin-resistant S. aureus infection in cystic fibrosis patients: a cohort study. Braz J Infect Dis 2016; 21:107-111. [PMID: 27755979 PMCID: PMC9425515 DOI: 10.1016/j.bjid.2016.09.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 08/27/2016] [Accepted: 09/02/2016] [Indexed: 11/25/2022] Open
Abstract
In Brazil the knowledge about methicillin-resistant Staphylococcus aureus infection in cystic fibrosis patients is scarce. This study aimed to determine the incidence of respiratory tract colonization and the identification rates after a standardized treatment. A retrospective cohort was performed highlighting the history of respiratory colonizations between January 2008 and June 2015. Patients under the age of 21 years with cystic fibrosis confirmed by sweat test or genetic study receiving care at the outpatient clinics of a Teaching Hospital were included. The treatment consisted of trimethoprim/sulfamethoxazole, rifampicin, nasal mupirocin and chlorhexidine 2%. The mean follow-up period was of 22.2 months and those with ≥3 negative cultures were considered free of methicillin-resistant Staphylococcus aureus. Forty-two patients were included. Methicillin-resistant Staphylococcus aureus was identified in six patients. Most patients had methicillin-sensitive S. aureus isolation prior to methicillin-resistant Staphylococcus aureus. Five children used the standardized treatment, none presented side effects. Only one child had a new isolation of methicillin-resistant Staphylococcus aureus during follow-up (after 20 months). The incidence of methicillin-resistant Staphylococcus aureus infection was high and occurred in young patients. The therapeutic regimen was effective, safe and being a good option to treat methicillin-resistant Staphylococcus aureus infection.
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Affiliation(s)
| | | | | | - Paulo José Marostica
- Universidade Federal do Rio Grande do Sul, Hospital das Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Edna Lúcia Souza
- Universidade Federal da Bahia, Faculdade de Medicina da Bahia, Salvador, BA, Brazil; Universidade Federal da Bahia, Hospital Universitário Professor Edgard Santos, Salvador, BA, Brazil.
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14
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Antimicrobial susceptibility of microorganisms isolated from sputum culture of patients with cystic fibrosis: Methicillin-resistant Staphylococcus aureus as a serious concern. Microb Pathog 2016; 100:201-204. [PMID: 27666507 DOI: 10.1016/j.micpath.2016.09.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 08/06/2016] [Accepted: 09/21/2016] [Indexed: 01/30/2023]
Abstract
INTRODUCTION Infection is a major cause of morbidity and mortality in patients with cystic fibrosis (CF). Antimicrobial resistance of the bacterial spp. particularly methicillin resistance in Staphylococcus aureus has caused a lot of attention. The aim of this study was to describe the prevalence of S. aureus, Pseudomonas aeruginosa and Burkholderia cepacia-complex as well as their antimicrobial susceptibility patterns in CF patients in an Iranian referral pediatrics Hospital. MATERIAL AND METHODS From March 2011 until February 2012, 172 samples were collected at the Children Medical Center (CMC), an Iranian referral hospital in Tehran, Iran. Sputum specimens were cultured for the following bacterial pathogens: P. aeruginosa, S. aureus, B. cepacia complex. Antimicrobial susceptibility was performed according to the Clinical Laboratory Standards Institute recommendations. RESULTS In our study, 54% of the patients (n = 93) harbored at least once S. aureus, 30% (n = 52) P. aeruginosa, and 2% (n = 3) Burkholderia cepacia. In 40 patients (23%), none of these organisms was grown. An increasing colonization rate of P. aeruginosa in the second decade of life was found. In contrast, the colonization rate of S. aureus was constant in both decades of life. Methicillin resistant S. aureus (MRSA) was detected in 40 isolates (43%). Among MRSA, no resistance against vancomycin, linezolid and quinupristin/dalfopristin occurred. The susceptibility of P. aeruginosa isolates to meropenem, imipenem, doripenem, levofloxacin and polymixin B were more than 90%. CONCLUSION The prevalence of MRSA has been rising. Since its impact on clinical outcomes, optimal prevention and treatment strategies are unclear, further studies to expand the knowledge about the infection control strategies and MRSA treatment are highly recommended.
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15
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Hector A, Kirn T, Ralhan A, Graepler-Mainka U, Berenbrinker S, Riethmueller J, Hogardt M, Wagner M, Pfleger A, Autenrieth I, Kappler M, Griese M, Eber E, Martus P, Hartl D. Microbial colonization and lung function in adolescents with cystic fibrosis. J Cyst Fibros 2016; 15:340-9. [PMID: 26856310 DOI: 10.1016/j.jcf.2016.01.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Revised: 01/24/2016] [Accepted: 01/24/2016] [Indexed: 11/18/2022]
Abstract
With intensified antibiotic therapy and longer survival, patients with cystic fibrosis (CF) are colonized with a more complex pattern of bacteria and fungi. However, the clinical relevance of these emerging pathogens for lung function remains poorly defined. The aim of this study was to assess the association of bacterial and fungal colonization patterns with lung function in adolescent patients with CF. Microbial colonization patterns and lung function parameters were assessed in 770 adolescent European (German/Austrian) CF patients in a retrospective study (median follow-up time: 10years). Colonization with Pseudomonas aeruginosa and MRSA were most strongly associated with loss of lung function, while mainly colonization with Haemophilus influenzae was associated with preserved lung function. Aspergillus fumigatus was the only species that was associated with an increased risk for infection with P. aeruginosa. Microbial interaction analysis revealed three distinct microbial clusters within the longitudinal course of CF lung disease. Collectively, this study identified potentially protective and harmful microbial colonization patterns in adolescent CF patients. Further studies in different patient cohorts are required to evaluate these microbial patterns and to assess their clinical relevance.
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Affiliation(s)
- Andreas Hector
- Children's Hospital of the University of Tübingen, Tübingen, Germany
| | - Tobias Kirn
- Children's Hospital of the University of Tübingen, Tübingen, Germany
| | - Anjali Ralhan
- Children's Hospital of the University of Tübingen, Tübingen, Germany
| | | | - Sina Berenbrinker
- Children's Hospital of the University of Tübingen, Tübingen, Germany
| | | | - Michael Hogardt
- Institute of Medical Microbiology and Hygiene, University of Frankfurt, Frankfurt, Germany
| | - Marlies Wagner
- Department of Pediatrics and Adolescence Medicine, Medical University of Graz, Graz, Austria
| | - Andreas Pfleger
- Department of Pediatrics and Adolescence Medicine, Medical University of Graz, Graz, Austria
| | - Ingo Autenrieth
- Institute of Medical Microbiology and Hygiene, University of Tübingen, Tübingen, Germany; German Center for Infection Research (DZIF), partner site Tübingen, Tübingen, Germany
| | - Matthias Kappler
- Department of Pediatric Pneumology, Hauner Children's Hospital, Ludwig-Maximilians University, Comprehensive Pneumology Center Munich (CPC-M), German Center for Lung Research (DZL), Munich, Germany
| | - Matthias Griese
- Department of Pediatric Pneumology, Hauner Children's Hospital, Ludwig-Maximilians University, Comprehensive Pneumology Center Munich (CPC-M), German Center for Lung Research (DZL), Munich, Germany
| | - Ernst Eber
- Department of Pediatrics and Adolescence Medicine, Medical University of Graz, Graz, Austria
| | - Peter Martus
- Institute of Clinical Epidemiology and Applied Biometry, University of Tübingen, Tübingen, Germany
| | - Dominik Hartl
- Children's Hospital of the University of Tübingen, Tübingen, Germany.
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16
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Infektionsschutz und spezielle Hygienemaßnahmen in klinischen Disziplinen. KRANKENHAUS- UND PRAXISHYGIENE 2016. [PMCID: PMC7152143 DOI: 10.1016/b978-3-437-22312-9.00005-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Emergence of cfr-Mediated Linezolid Resistance in a Methicillin-Resistant Staphylococcus aureus Epidemic Clone Isolated from Patients with Cystic Fibrosis. Antimicrob Agents Chemother 2015; 60:1878-82. [PMID: 26666940 DOI: 10.1128/aac.02067-15] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 12/05/2015] [Indexed: 11/20/2022] Open
Abstract
Resistance to linezolid (LZD) in methicillin-resistant Staphylococcus aureus (MRSA) isolates from patients with cystic fibrosis (CF) is due mainly to ribosomal mutations. We report on four CF patients with LZD-resistant MRSA bronchopulmonary infections by strains carrying the cfr gene. Strains from one patient also harbored the G2576U mutation (23S rRNA) and the G139R substitution (L3 protein). All strains belonged to the epidemic clone ST125 MRSA IVc. Our results support the monitoring of LZD resistance emergence in CF and non-CF MRSA isolates.
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18
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Jeremiah CJ, Kandiah JP, Spelman DW, Giffard PM, Coombs GW, Jenney AW, Tong SY. Differing epidemiology of two major healthcare-associated meticillin-resistant Staphylococcus aureus clones. J Hosp Infect 2015; 92:183-90. [PMID: 26778134 DOI: 10.1016/j.jhin.2015.10.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 10/20/2015] [Indexed: 12/23/2022]
Abstract
BACKGROUND Two meticillin-resistant Staphylococcus aureus (MRSA) clones, sequence type (ST) 22 and ST239, have successfully spread globally. Across Australia, ST22 has supplanted ST239 as the main healthcare-associated MRSA. To understand the reasons underlying this shift, the epidemiology and clinical features of infections due to ST22 and ST239 MRSA isolates from a tertiary hospital in Melbourne, Australia were compared. METHODS Over six months, consecutive MRSA isolates with clinical data were collected from specimens referred to Alfred Health Pathology (AHP). Isolates were genotyped by a multi-locus-sequence-typing-based high-resolution melting method. FINDINGS Three hundred and twenty-eight of 1079 (30%) S. aureus isolated by AHP were MRSA. Of these, 313 were genotyped; 78 (25%) were clonal complex (CC) 22 (representing ST22) and 142 (45%) were CC239 (representing ST239). Common clinical syndromes included skin or soft tissue, respiratory tract and osteo-articular infections. On multi-variate logistic regression, compared with CC239, CC22 was associated with older patients [adjusted odds ratio (aOR) 1.04 for each year increase, 95% confidence interval (CI) 1.02-1.07)], and patients from subacute hospitals (aOR 2.7, 95% CI 1.2-5.8) or long-term care facilities (LTCFs; aOR 5.5, 95% CI 2.0-14.5). Median time from patient admission to MRSA isolation was nine days for CC239 and one day for CC22 (P < 0.01). MRSA strain epidemiology varied according to hospital unit. CONCLUSIONS CC22 and CC239 MRSA have differing ecological niches. CC22 is associated with elderly patients in LTCFs, and CC239 is associated with nosocomial acquisition. Infection control strategies involving LTCFs and their residents will likely be required to achieve continued MRSA control.
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Affiliation(s)
- C J Jeremiah
- Department of Infectious Diseases, St Vincent's Hospital, Fitzroy, VIC, Australia; Department of Medicine, The Northern Hospital, Epping, VIC, Australia.
| | | | - D W Spelman
- Department of Infectious Diseases and Microbiology, Alfred Health and Monash University, Melbourne, VIC, Australia
| | - P M Giffard
- Menzies School of Health Research, Casuarina, NT, Australia
| | - G W Coombs
- Department of Microbiology and Infectious Diseases, PathWest Laboratory Medicine-WA, Royal Perth Hospital, Perth, WA, Australia; Australian Collaborating Centre for Enterococcus and Staphylococcus Species Typing and Research, School of Veterinary and Life Sciences, Murdoch University and School of Biomedical Sciences, Curtin University, Perth, WA, Australia
| | - A W Jenney
- Department of Infectious Diseases and Microbiology, Alfred Health and Monash University, Melbourne, VIC, Australia
| | - S Y Tong
- Menzies School of Health Research, Casuarina, NT, Australia; Royal Darwin Hospital, Casuarina, NT, Australia
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19
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Ahlgren HG, Benedetti A, Landry JS, Bernier J, Matouk E, Radzioch D, Lands LC, Rousseau S, Nguyen D. Clinical outcomes associated with Staphylococcus aureus and Pseudomonas aeruginosa airway infections in adult cystic fibrosis patients. BMC Pulm Med 2015; 15:67. [PMID: 26093634 PMCID: PMC4475617 DOI: 10.1186/s12890-015-0062-7] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 06/10/2015] [Indexed: 01/20/2023] Open
Abstract
BACKGROUND Staphylococcus aureus (SA) is the most prevalent organism infecting the respiratory tract of CF children, and remains the second most prevalent organism in CF adults. During early childhood, SA infections are associated with pulmonary inflammation and decline in FEV1, but their clinical significance in adult CF patients is poorly characterized. METHODS We conducted a retrospective cross-sectional study to determine the association between airway microbiology and clinical outcomes (FEV1, rate of pulmonary exacerbations, CRP levels and clinical scores). RESULTS In a cohort of 84 adult CF patients, 24 % were infected with SA only, 60 % were infected with PA, and 16 % had neither PA nor SA. CF patients with SA experienced fewer pulmonary exacerbations and lower CRP levels than those with PA. CONCLUSION In adult CF patients, SA infections alone, in the absence of PA, are a marker of milder disease.
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Affiliation(s)
| | - Andrea Benedetti
- Department of Medicine, McGill University, Montreal, Canada. .,Department of Epidemiology, Biostatistics & Occupational Health, McGill University, Montreal, Canada. .,Respiratory Epidemiology and Clinical Research Unit, McGill University Health Center, Montreal, Canada.
| | - Jennifer S Landry
- Department of Medicine, McGill University, Montreal, Canada. .,Respiratory Epidemiology and Clinical Research Unit, McGill University Health Center, Montreal, Canada.
| | - Joanie Bernier
- Adult CF clinic, McGill University Health Center, Montreal, Canada.
| | - Elias Matouk
- Department of Medicine, McGill University, Montreal, Canada. .,Adult CF clinic, McGill University Health Center, Montreal, Canada.
| | - Danuta Radzioch
- Department of Medicine, McGill University, Montreal, Canada. .,Department of Medicine, McGill University Health Center Research Institute, Montreal, Canada. .,Department of Human Genetics, McGill University, Montreal, Canada.
| | - Larry C Lands
- Department of Pediatrics, McGill University Health Center Research Institute, Montreal, Canada.
| | - Simon Rousseau
- Department of Medicine, McGill University, Montreal, Canada. .,Department of Medicine, McGill University Health Center Research Institute, Montreal, Canada.
| | - Dao Nguyen
- Department of Medicine, McGill University, Montreal, Canada. .,Department of Medicine, McGill University Health Center Research Institute, Montreal, Canada.
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21
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Parkins MD, Floto RA. Emerging bacterial pathogens and changing concepts of bacterial pathogenesis in cystic fibrosis. J Cyst Fibros 2015; 14:293-304. [PMID: 25881770 DOI: 10.1016/j.jcf.2015.03.012] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 03/21/2015] [Accepted: 03/22/2015] [Indexed: 12/22/2022]
Abstract
Chronic suppurative lower airway infection is a hallmark feature of cystic fibrosis (CF). Decades of experience in clinical microbiology have enabled the development of improved technologies and approaches for the cultivation and identification of microorganisms from sputum. It is increasingly apparent that the microbial constituents of the lower airways in CF exist in a dynamic state. Indeed, while changes in prevalence of various pathogens occur through ageing, differences exist in successive cohorts of patients and between clinics, regions and countries. Classical pathogens such as Pseudomonas aeruginosa, Burkholderia cepacia complex and Staphylococcus aureus are increasingly being supplemented with new and emerging organisms rarely observed in other areas of medicine. Moreover, it is now recognized that common oropharyngeal organisms, previously presumed to be benign colonizers may contribute to disease progression. As infection remains the leading cause of morbidity and mortality in CF, an understanding of the epidemiology, risk factors for acquisition and natural history of infection including interactions between colonizing bacteria is required. Unified approaches to the study and determination of pathogen status are similarly needed. Furthermore, experienced and evidence-based treatment data is necessary to optimize outcomes for individuals with CF.
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Affiliation(s)
- Michael D Parkins
- Department of Medicine, The University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada; Microbiology, Immunology and Infectious Diseases, The University of Calgary, 3330 Hospital Drive NW, Calgary, AB T2N 4N1, Canada.
| | - R Andres Floto
- Cambridge Institute for Medical Research, University of Cambridge, Papworth Hospital, Cambridge CB23 3RE, UK; Cambridge Centre for Lung Infection, Papworth Hospital, Cambridge CB23 3RE, UK.
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22
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López-Collazo E, Jurado T, de Dios Caballero J, Pérez-Vázquez M, Vindel A, Hernández-Jiménez E, Tamames J, Cubillos-Zapata C, Manrique M, Tobes R, Máiz L, Cantón R, Baquero F, Del Campo R. In vivo attenuation and genetic evolution of a ST247-SCCmecI MRSA clone after 13 years of pathogenic bronchopulmonary colonization in a patient with cystic fibrosis: implications of the innate immune response. Mucosal Immunol 2015; 8:362-71. [PMID: 25118167 DOI: 10.1038/mi.2014.73] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Accepted: 07/12/2014] [Indexed: 02/04/2023]
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) causes chronic pulmonary infections in patients with cystic fibrosis (CF). This study tracks the 13-year evolution (1996-2009) of a single MRSA clone in a male patient with CF, evaluating both the host immunogenic response and the microbial variations. Whole-genome sequencing was performed for the initial (CF-96) and evolved (CF-09) isolates. The immunogenicity of CF-96 and CF-09 was evaluated by incubation with innate immune cells from healthy volunteers. We also studied the patient's innate immune response profile, cytokine production, expression of triggering receptor expressed on myeloid cells-1 (TREM-1), and phagocytosis. A total of 30 MRSA ST247-SCCmecI-pvl(-) isolates were collected, which evidenced a genome size reduction from the CF-96 ancestor to the evolved CF-09 strain. Up to six changes in the spa-type were observed over the course of the 13-year evolution. Cytokine production, TREM-1 expression, and phagocytosis were significantly lower for the healthy volunteer monocytes exposed to CF-09, compared with those exposed to CF-96. Patient monocytes exhibited a reduced inflammatory response when challenged with CF-09. Genetic changes in MRSA, leading to reduced immunogenicity and entry into the refractory state, may contribute to the attenuation of virulence and efficient persistence of the bacteria in the CF lung.
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Affiliation(s)
- E López-Collazo
- 1] Department of Tumor Immunology, IdiPAZ, Madrid, Spain [2] Innate Inmmunity Group, IdiPAZ and University Hospital La Paz, Madrid, Spain
| | - T Jurado
- Department of Tumor Immunology, IdiPAZ, Madrid, Spain
| | - J de Dios Caballero
- Department of Microbiology, University Hospital Ramón y Cajal and IRYCIS, Madrid, Spain
| | - M Pérez-Vázquez
- Department of Microbial Community Modeling, National Biotechnology Center, CSIC, Madrid, Spain
| | - A Vindel
- Department of Microbial Community Modeling, National Biotechnology Center, CSIC, Madrid, Spain
| | | | - J Tamames
- National Microbiology Center, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | | | - M Manrique
- Oh no sequences! Research group, Era7 Bioinformatics, Granada, Spain
| | - R Tobes
- Oh no sequences! Research group, Era7 Bioinformatics, Granada, Spain
| | - L Máiz
- Cystic Fibrosis Unit, University Hospital Ramón y Cajal, Madrid, Spain
| | - R Cantón
- 1] National Microbiology Center, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain [2] Cystic Fibrosis Unit, University Hospital Ramón y Cajal, Madrid, Spain [3] Spanish Network for the Research in Infectious Diseases (REIPI), Instituto de Salud Carlos III, Madrid, Spain
| | - F Baquero
- 1] National Microbiology Center, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain [2] CIBER en Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - R Del Campo
- 1] National Microbiology Center, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain [2] CIBER en Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
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Hall H, Gadhok R, Alshafi K, Bilton D, Simmonds NJ. Eradication of respiratory tract MRSA at a large adult cystic fibrosis centre. Respir Med 2015; 109:357-63. [PMID: 25683032 DOI: 10.1016/j.rmed.2015.01.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Revised: 12/23/2014] [Accepted: 01/24/2015] [Indexed: 11/26/2022]
Abstract
INTRODUCTION The prevalence of MRSA in patients with CF is increasing. There is no consensus as to the optimum treatment. METHOD An observational cohort study of all patients with MRSA positive sputum, 2007-2012. All eradication attempts with subsequent culture results were reviewed. Single vs dual antibiotic regimens were compared for both new and chronic infections. RESULTS 37 patients (median FEV1 58.7 (27.6-111.5)% predicted) were identified, of which 67.6% (n = 25) had newly acquired MRSA. Compared with single regimens, a high proportion of dual regimens achieved MRSA eradication (84.6% vs 50%; p = 0.1) for new infections. Rifampicin/Fusidic acid was associated with high success rates (100% vs 60% for other dual regimens (p = 0.13)). Compared with new infections, chronic MRSA was much less likely to be eradicated (18.2%, p = 0.01). CONCLUSION Combined antibiotic therapy, particularly Rifampicin/Fusidic acid, is a well-tolerated and effective means of eradicating MRSA in patients with cystic fibrosis.
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Affiliation(s)
- H Hall
- Adult Cystic Fibrosis Centre, Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
| | - R Gadhok
- Adult Cystic Fibrosis Centre, Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
| | - K Alshafi
- Dept of Microbiology, Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK
| | - D Bilton
- Adult Cystic Fibrosis Centre, Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK; National Heart and Lung Institute, Imperial College, Dovehouse Street, London SW3 6LY, UK
| | - N J Simmonds
- Adult Cystic Fibrosis Centre, Royal Brompton Hospital, Sydney Street, London SW3 6NP, UK; National Heart and Lung Institute, Imperial College, Dovehouse Street, London SW3 6LY, UK.
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The Agr quorum-sensing system regulates fibronectin binding but not hemolysis in the absence of a functional electron transport chain. Infect Immun 2014; 82:4337-47. [PMID: 25092909 DOI: 10.1128/iai.02254-14] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Staphylococcus aureus is responsible for numerous chronic and recurrent infections, which are frequently associated with the emergence of small-colony variants (SCVs) that lack a functional electron transport chain. SCVs exhibit enhanced expression of fibronectin-binding protein (FnBP) and greatly reduced hemolysin production, although the basis for this is unclear. One hypothesis is that these phenotypes are a consequence of the reduced Agr activity of SCVs, while an alternative is that the lack of a functional electron transport chain and the resulting reduction in ATP production are responsible. Disruption of the electron transport chain of S. aureus genetically (hemB and menD) or chemically, using 2-n-heptyl-4-hydroxyquinoline N-oxide (HQNO), inhibited both growth and Agr activity and conferred an SCV phenotype. Supplementation of the culture medium with synthetic autoinducing peptide (sAIP) significantly increased Agr expression in both hemB mutant strains and S. aureus grown with HQNO and significantly reduced staphylococcal adhesion to fibronectin. However, sAIP did not promote hemolysin expression in hemB mutant strains or S. aureus grown with HQNO. Therefore, while Agr regulates fibronectin binding in SCVs, it cannot promote hemolysin production in the absence of a functional electron transport chain.
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Molecular epidemiology of methicillin-resistant Staphylococcus aureus isolated in serial cultures from the respiratory tract of children with cystic fibrosis. Pediatr Infect Dis J 2014; 33:549-53. [PMID: 24220228 PMCID: PMC4016999 DOI: 10.1097/inf.0000000000000204] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Little is known about strain relatedness of methicillin-resistant Staphyloccocus aureus (MRSA) isolated at serial time points from the respiratory tract of patients with cystic fibrosis (CF). The objectives are to interrogate the genetic diversity of MRSA recovered in serial cultures from children with CF and to correlate strain relatedness with clinical characteristics. METHODS We performed a retrospective analysis of children with CF from whom MRSA was isolated from serial respiratory cultures from 2005 to 2011. Within individual patients, relatedness of isolated strains was determined by repetitive-sequence polymerase chain reaction, and the staphylococcal cassette chromosome mec type of each isolate was characterized. Medical records corresponding to the MRSA cultures were reviewed. RESULTS We identified 54 CF patients with serial MRSA cultures (145 distinct cultures). Over time, 45 (83%) patients maintained the same strain type and 9 (17%) possessed at least 2 distinct strain types. A total of 91 pairs of isolates were analyzed for strain relatedness. Of these, 81 (89%) were identical and 10 (11%) were distinct strain types. About 117 (83%) isolates were staphylococcal cassette chromosome mec type II, 24 (17%) were staphylococcal cassette chromosome mec type IV and 4 were other types not resolvable with our assay. Clinical factors, including time interval and prescription of antibiotics effective against MRSA between positive cultures, did not correlate with acquisition of a distinct MRSA strain by individual patients. CONCLUSIONS Our data suggest that sustained presence of MRSA in CF patients is most commonly attributable to identical strain types. Acquisition of distinct MRSA strains in the airway is infrequent.
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Empfehlungen zur Prävention und Kontrolle von Methicillin-resistenten Staphylococcus aureus-Stämmen (MRSA) in medizinischen und pflegerischen Einrichtungen. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2014. [DOI: 10.1007/s00103-014-1980-x] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Wong JK, Ranganathan SC, Hart E. Staphylococcus aureus in early cystic fibrosis lung disease. Pediatr Pulmonol 2013; 48:1151-9. [PMID: 23970476 DOI: 10.1002/ppul.22863] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 06/29/2013] [Indexed: 01/04/2023]
Abstract
Staphylococcus aureus: is a common bacterial organism infecting children with cystic fibrosis (CF). Emerging evidence suggests early lower airway infection with this organism in young children with CF results in the deterioration of lung function, poorer nutrition parameters and heightens the airway inflammatory response. Despite contributing significantly to the burden of early lung disease among this group, there are ongoing controversies in the management of S. aureus infection, and gaps in our understanding of exactly how this organism causes lung disease. To reduce the morbidity and mortality of early infection ongoing research is needed to: (i) understand the early host immune response that enables this pathogen to reside within the CF lung; (ii) determine if there are organism specific factors that are associated with CF lung disease; and (iii) clarify the utility of anti-staphylococcal antibiotic prophylaxis and/or eradication in the treatment of this patient population.
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Affiliation(s)
- John K Wong
- Department of Respiratory Medicine, Royal Children's Hospital, Melbourne, Australia; Murdoch Childrens Research Institute, Melbourne, Australia
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Bacterial respiratory pathogens in children with inherited immune and airway disorders: nasopharyngeal carriage and disease risk. Pediatr Infect Dis J 2013; 32:399-404. [PMID: 23552676 DOI: 10.1097/inf.0b013e31827db77a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Children with primary immunodeficiencies, sickle cell disease and cystic fibrosis are at risk to develop invasive bacterial infections caused by respiratory tract pathogens, in particular Streptococcus pneumoniae, Haemophilus influenzae and Staphylococcus aureus. This review article evaluates the role of nasopharyngeal colonization by these pathogens in the high prevalence of respiratory and invasive infections in children with inherited disorders affecting the immune system or the respiratory tract. We conclude that respiratory and invasive diseases that occur in children with primary immunodeficiencies or sickle cell disease are probably a result of increased nasopharyngeal colonization rates compared with healthy children. However, when the inherited disorder is characterized by local airway abnormalities such as in cystic fibrosis, enhanced nasopharyngeal colonization does not seem to play a major role in invasive disease risk. As the evidence for the role of nasopharyngeal colonization in disease risk in these specific patient groups partly comes from experimental studies and animal models, longitudinal studies in children are needed. Detailed understanding of the effect of colonization on the development of respiratory and invasive infections in children with primary immunodeficiencies, sickle cell disease or cystic fibrosis provides a justification for the selective introduction of vaccination and prophylactic antibiotic treatment. Recommendations for the use of (preventive) therapeutic strategies in these patient groups taking into account disease-specific immunologic mechanisms underlying colonization and disease are described.
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Hubert D, Réglier-Poupet H, Sermet-Gaudelus I, Ferroni A, Le Bourgeois M, Burgel PR, Serreau R, Dusser D, Poyart C, Coste J. Association between Staphylococcus aureus alone or combined with Pseudomonas aeruginosa and the clinical condition of patients with cystic fibrosis. J Cyst Fibros 2013; 12:497-503. [PMID: 23291443 DOI: 10.1016/j.jcf.2012.12.003] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Revised: 11/19/2012] [Accepted: 12/05/2012] [Indexed: 11/26/2022]
Abstract
BACKGROUND The prevalence of methicillin-resistant Staphylococcus aureus (MRSA) in cystic fibrosis (CF) patients has increased and MRSA seems to be associated with a poorer prognosis. The aim of this study was to assess the prevalence and clinical consequences of MRSA and methicillin-susceptible Staphylococcus aureus (MSSA), associated or not associated with Pseudomonas aeruginosa (PA). METHODS In a retrospective study on 419 sputum producer patients (293 adults and 126 children >7 years of age), we recorded patient characteristics, lung function, nutritional status, i.v. antibiotics and hospitalisations, the presence of SA and/or PA and FEV1 decline over 2 years. RESULTS SA was found in 72% of the patients: MSSA in 68.2% of children and 48.8% of adults; MRSA in 17.5% of children and 17.8% of adults. Sixty percent of MRSA patients and 60.4% of MSSA patients also harboured PA. The rate of deterioration of clinical status of the various groups, as assessed from respiratory function, i.v. antibiotic courses and hospitalisations, increased in the order: no SA/no PA, MSSA alone, MRSA alone, MSSA/PA, MRSA/PA, and PA alone. Nutritional status did not differ between groups. Results were roughly similar for children and adults. The yearly FEV1 decline was significantly higher only for MRSA/PA patients (p=0.03) compared to no SA/no PA patients. CONCLUSION Clinical condition of CF patients with MSSA only or MRSA only appeared similar, whereas MRSA/PA patients had more severe respiratory function than MSSA/PA patients. In CF patients, MRSA might be more deleterious than MSSA only when associated with PA.
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