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Hansen SK, Kaya H, Roer L, Hansen F, Skovgaard S, Justesen US, Hansen DS, Andersen LP, Knudsen JD, Røder BL, Østergaard C, Søndergaard T, Dzajic E, Wang M, Samulioniené J, Hasman H, Hammerum AM. Molecular characterization of Danish ESBL/AmpC-producing Klebsiella pneumoniae from bloodstream infections, 2018. J Glob Antimicrob Resist 2020; 22:562-567. [PMID: 32512235 DOI: 10.1016/j.jgar.2020.05.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/19/2020] [Accepted: 05/27/2020] [Indexed: 12/01/2022] Open
Abstract
OBJECTIVES The aim of the study was to molecularly characterize third-generation cephalosporin-resistant Klebsiella pneumoniae isolated from bloodstream infections in Denmark in 2018 using whole-genome sequencing (WGS) data, and to compare these isolates to the most common clones detected in 2006 and 2008. METHODS Sixty-two extended-spectrum beta-lactamase (ESBL)/AmpC-producing K. pneumoniae isolates from Danish blood cultures from 2018 were analysed using WGS to obtain multilocus sequence typing (MLST), core genome MLST (cgMLST), resistance profile and phylogeny. These were compared to the most common ESBL K. pneumoniae clones detected in 2006 and 2008. RESULTS The most common ESBL clone was ST15 CTX-M-15, the DHA-1 enzyme was the most common in AmpC isolates, and the OXA-48-like group was the most common carbapenemase. Thirty-nine different sequence types (STs) were found, with the most frequent being ST14, ST15 and ST37, accounting for 24% of the isolates. The isolates were subdivided into 55 complex types (CTs) of which 49 were singletons, with the most frequent being ST14-CT2080. Two of the CTX-M-15-producing isolates from 2018 belonged to the ST15-CT105/CT3078 clone, which was first detected in 2006. CONCLUSIONS The ESBL/AmpC K. pneumoniae isolates detected in Danish blood cultures belonged to many different types. No dominant clones were circulating in Danish hospitals, but the ST15-CT105/CT3078 CTX-M-15 K. pneumoniae clone was seen 13 years after its first detection.
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Affiliation(s)
- Sanne Kjær Hansen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark; Department of Clinical Microbiology, Odense University Hospital, Odense C, Denmark
| | - Hülya Kaya
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark
| | - Louise Roer
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark
| | - Frank Hansen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark
| | - Sissel Skovgaard
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark
| | - Ulrik Stenz Justesen
- Department of Clinical Microbiology, Odense University Hospital, Odense C, Denmark
| | | | | | - Jenny Dahl Knudsen
- Department of Clinical Microbiology, Hvidovre University Hospital, Hvidovre, Denmark
| | - Bent L Røder
- Department of Clinical Microbiology, Zealand University Hospital, Slagelse, Denmark
| | - Claus Østergaard
- Department of Clinical Microbiology, Lillebaelt Hospital, Vejle, Denmark
| | - Turid Søndergaard
- Department of Clinical Microbiology, Hospital Sønderjylland, Sønderborg, Denmark
| | - Esad Dzajic
- Department of Clinical Microbiology, Hospital South West Jutland, Esbjerg, Denmark
| | - Mikala Wang
- Department of Clinical Microbiology, Aarhus University Hospital, Aarhus, Denmark
| | - Jurgita Samulioniené
- Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark
| | - Henrik Hasman
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark
| | - Anette M Hammerum
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen S, Denmark.
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Hammerum AM, Lauridsen CAS, Blem SL, Roer L, Hansen F, Henius AE, Holzknecht BJ, Søes L, Andersen LP, Røder BL, Justesen US, Østergaard C, Søndergaard T, Dzajic E, Wang M, Fulgsang-Damgaard D, Møller KL, Porsbo LJ, Hasman H. Investigation of possible clonal transmission of carbapenemase-producing Klebsiella pneumoniae complex member isolates in Denmark using core genome MLST and National Patient Registry Data. Int J Antimicrob Agents 2020; 55:105931. [PMID: 32135203 DOI: 10.1016/j.ijantimicag.2020.105931] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/29/2020] [Accepted: 02/23/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVES The aim of this study was to identify clonally-related carbapenemase-producing Klebsiella pneumoniae complex members that could be involved in outbreaks among hospitalized patients in Denmark, and to identify possible epidemiological links. METHODS From January 2014 to June 2018, 103 isolates belonging to the K. pneumoniae complex were collected from 102 patients. From the whole-genome sequencing (WGS) data, presence of genes encoding carbapenemase and multilocal sequence typing (MLST) data were extracted. Core genome MLST (cgMLST) cluster analysis was performed. Using data from the Danish National Patient Registry (DNPR) and reported travel history, presumptive outbreaks were investigated for possible epidemiological links. RESULTS The most common detected carbapenemase gene was blaOXA-48, followed by blaNDM-1. The 103 K. pneumoniae complex isolates belonged to 47 sequence types (STs) and cgMLST subdivided the isolates into 80 different complex types. cgMLST identified 13 clusters with 2-4 isolates per cluster. For five of the 13 clusters, a direct link (the patients stayed at the same ward on the same day) could be detected between at least some of the patients. In two clusters, the patients resided simultaneously at the same hospital, but not the same ward. A possible link (same ward within 1-13 days) was detected for the patients in one cluster. For five clusters detected by cgMLST, no epidemiological link could be detected using data from DNPR. CONCLUSION In this study, cgMLST combined with patient hospital admission data and travel information was found to be a reliable and detailed approach to detect possible clonal transmission of carbapenemase-producing K. pneumoniae complex members.
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Affiliation(s)
- Anette M Hammerum
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark.
| | - Caroline A S Lauridsen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Sanne L Blem
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Louise Roer
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Frank Hansen
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Anna E Henius
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | | | - Lillian Søes
- Department of Clinical Microbiology, Hvidovre University Hospital, Hvidovre, Denmark
| | - Leif P Andersen
- Department of Clinical Microbiology, Rigshospitalet, Copenhagen, Denmark
| | - Bent L Røder
- Department of Clinical Microbiology, Slagelse Hospital, Slagelse, Denmark
| | - Ulrik S Justesen
- Department of Clinical Microbiology, Odense University Hospital, Odense, Denmark
| | - Claus Østergaard
- Department of Clinical Microbiology, Lillebaelt Hospital, Vejle, Denmark
| | - Turid Søndergaard
- Department of Clinical Microbiology, Hospital Sønderjylland, Sønderborg, Denmark
| | - Esad Dzajic
- Department of Clinical Microbiology, Hospital South West Jutland, Esbjerg, Denmark
| | - Mikala Wang
- Department of Clinical Microbiology, Aarhus University Hospital, Aarhus, Denmark
| | | | | | - Lone Jannok Porsbo
- Infectious Disease Epidemiology & Prevention, Statens Serum Institut, Copenhagen, Denmark
| | - Henrik Hasman
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
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Ulriksen HU, Søndergaard T, Pedersen TG, Pedersen K. Plasmon enhanced light scattering into semiconductors by aperiodic metal nanowire arrays. Opt Express 2019; 27:14308-14320. [PMID: 31163881 DOI: 10.1364/oe.27.014308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 04/11/2019] [Indexed: 06/09/2023]
Abstract
Light scattering from nanostructures is an essential ingredient in several optical technologies, and experimental verification of simulations of light scattering is important. In particular, solar cells may benefit from light-trapping due to scattering. However, light that is successfully trapped in an absorbing media such as e.g. Si necessarily escapes direct detection. We present in this paper a technique for direct measurement and analysis of light scattering from nanostructures on a surface, exemplified with aperiodic patterns of Ag strips placed on a GaAs substrate. By placing the structures on the flat face of a half-cylinder, the angular distribution of light scattered into the azimuth plane can be directly detected, including directions above the critical angle that would be captured if the substrate had the form of a slab. Modelling of the scattered light by summing up contributions from each strip agrees with the experimental results to a very detailed level, both for scattering backward and into the substrate.
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Søndergaard T, Lenstra D, Tromborg B. Near fields and far fields generated by sources in the presence of dielectric structures with cylindrical symmetry. Opt Lett 2001; 26:1705-1707. [PMID: 18049706 DOI: 10.1364/ol.26.001705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A full-vectorial integral equation method is presented for calculating near fields and far fields generated by sources in the presence of general finite-sized dielectric structures with cylindrical symmetry. The method is relevant for modeling of a class of antenna designs and some optical components with cylindrical symmetry, e.g., vertical-cavity surface-emitting lasers, microdisk lasers, and light-emitting diodes.
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Abstract
We present what is to our knowledge the first theoretical analysis of air-guiding photonic bandgap fibers. The fibers are characterized by a large hollow core and a microstructured cladding exhibiting photonic bandgap effects. Using an efficient, full-vectorial numerical method, we explain the operational principle of the fibers and obtain detailed information about the properties of the air-guided modes. This information includes accurate determination of the modes' spectral extent, cutoff properties, and mode-field distributions.
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Pedersen SG, Søndergaard T, Biskjaer NL. [Infectious mononucleosis complicated by mediastinal and subcutaneous emphysema]. Ugeskr Laeger 1983; 145:1945-6. [PMID: 6612813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Erichsen G, Hauge M, Madsen CM, Roed-Petersen K, Søndergaard T. Two-generation transmission of oesophageal atresia with tracheo-oesophageal fistula. Acta Paediatr Scand 1981; 70:253-4. [PMID: 7234408 DOI: 10.1111/j.1651-2227.1981.tb05550.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Fasting H, Axelsen F, Søndergaard T. Atrial septal defect, primum type. Results of surgical closure in 46 patients. Scand J Thorac Cardiovasc Surg 1980; 14:165-8. [PMID: 7433935 DOI: 10.3109/14017438009100992] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Surgical closure of an atrial septal defect of the ostium primum type was performed in 46 patients during the years 1965-78. All closures were performed with a Dacron patch and the mitral valve defect was sutured. The operative mortality was 6.5%. Pre-operatively, all patients had right bundle-branch block with left axis deviation. Severe heart block did not develop in any of the survivors. One of the patients who died had a partial atrioventricular block postoperatively. Arrhythmia developed in 5 patients, but was cardioverted to sinus rhythm. The operative technique of placing the lower sutures at the mitral valve parallel to the annulus to avoid the conduction bundle is emphasized. Repair of the tricuspid valve was performed in 10 cases and simultaneous closure of a secundum defect was made in 14. Preoperative catheterization revealed arteriovenous shunts ranging from 60 to 500% of the cardiac output. Recatheterization of 32 patients one year postoperatively showed residual shunts ranging from 20 to 75% in 5 patients who were otherwise without clinical symptoms. All survivors had a systolic apical murmur of the mitral insufficiency type.
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Fasting H, Axelsen F, Søndergaard T. [Atrial septal defect, primum type. Results of surgical treatment of 40 patients]. Ugeskr Laeger 1979; 141:1630-2. [PMID: 380097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Gürtler R, Lüthy E, Senn A, Søndergaard T. Die Hämodynamik des Vorhofseptumdefektes (persistierendes Ostium secundum) vor und nach der Schließung durch eine Circumclusio defectus septi interatriensis nach Søndergaard. Cardiology 1957. [DOI: 10.1159/000165736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Søndergaard T. Valvulotomy for pulmonary stenosis performed through the main stem of the pulmonary artery utilizing a special ring clamp. Acta Chir Scand 1953; 104:362-72. [PMID: 13057489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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Søndergaard T. [Elastic adhesive bandage in therapy of ingrown toenail]. Ugeskr Laeger 1952; 114:1184-6. [PMID: 13029185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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