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Page 1
Epidemiological characterisation of the first 785 SARS-CoV-2 Omicron variant cases in Denmark, December 2021.
Espenhain L, Funk T, Overvad M, Edslev SM, Fonager J, Ingham AC, Rasmussen M, Madsen SL, Espersen CH, Sieber RN, Stegger M, Gunalan V, Wilkowski B, Larsen NB, Legarth R, Cohen AS, Nielsen F, Lam JUH, Lavik KE, Karakis M, Spiess K, Marving E, Nielsen C, Wiid Svarrer C, Bybjerg-Grauholm J, Olsen SS, Jensen A, Krause TG, Müller L. Espenhain L, et al. Among authors: sieber rn. Euro Surveill. 2021 Dec;26(50):2101146. doi: 10.2807/1560-7917.ES.2021.26.50.2101146. Euro Surveill. 2021. PMID: 34915977 Free PMC article.
Spread of LA-MRSA CC398 in Danish mink (Neovison vison) and mink farm workers.
Hansen JE, Stegger M, Pedersen K, Sieber RN, Larsen J, Larsen G, Lilje B, Chriél M, Andersen PS, Larsen AR. Hansen JE, et al. Among authors: sieber rn. Vet Microbiol. 2020 Jun;245:108705. doi: 10.1016/j.vetmic.2020.108705. Epub 2020 May 1. Vet Microbiol. 2020. PMID: 32456821 Free article.
Increased transmissibility of SARS-CoV-2 lineage B.1.1.7 by age and viral load.
Lyngse FP, Mølbak K, Skov RL, Christiansen LE, Mortensen LH, Albertsen M, Møller CH, Krause TG, Rasmussen M, Michaelsen TY, Voldstedlund M, Fonager J, Steenhard N; Danish Covid-19 Genome Consortium; Kirkeby CT. Lyngse FP, et al. Nat Commun. 2021 Dec 13;12(1):7251. doi: 10.1038/s41467-021-27202-x. Nat Commun. 2021. PMID: 34903718 Free PMC article.
Molecular epidemiology of the SARS-CoV-2 variant Omicron BA.2 sub-lineage in Denmark, 29 November 2021 to 2 January 2022.
Fonager J, Bennedbæk M, Bager P, Wohlfahrt J, Ellegaard KM, Ingham AC, Edslev SM, Stegger M, Sieber RN, Lassauniere R, Fomsgaard A, Lillebaek T, Svarrer CW, Møller FT, Møller CH, Legarth R, Sydenham TV, Steinke K, Paulsen SJ, Castruita JAS, Schneider UV, Schouw CH, Nielsen XC, Overvad M, Nielsen RT, Marvig RL, Pedersen MS, Nielsen L, Nilsson LL, Bybjerg-Grauholm J, Tarpgaard IH, Ebsen TS, Lam JUH, Gunalan V, Rasmussen M. Fonager J, et al. Among authors: sieber rn. Euro Surveill. 2022 Mar;27(10):2200181. doi: 10.2807/1560-7917.ES.2022.27.10.2200181. Euro Surveill. 2022. PMID: 35272746 Free PMC article.
Increased transmission of SARS-CoV-2 in Denmark during UEFA European championships.
Bennedbæk M, Button MSF, Nielsen LB, Bybjerg-Grauholm J, Wiid Svarrer C, Møller KL, Kristensen B, Legarth R, Gunalan V, Zenas DR, Irshad I, Gubbels S, Sieber RN, Stegger M, Valentiner-Branth P, Rasmussen M, Møller CH, Fonager J, Moller FT. Bennedbæk M, et al. Among authors: sieber rn. Epidemiol Infect. 2022 Mar 23;150:e123. doi: 10.1017/S095026882200019X. Epidemiol Infect. 2022. PMID: 35317884 Free PMC article.
Risk of hospitalisation associated with infection with SARS-CoV-2 omicron variant versus delta variant in Denmark: an observational cohort study.
Bager P, Wohlfahrt J, Bhatt S, Stegger M, Legarth R, Møller CH, Skov RL, Valentiner-Branth P, Voldstedlund M, Fischer TK, Simonsen L, Kirkby NS, Thomsen MK, Spiess K, Marving E, Larsen NB, Lillebaek T, Ullum H, Mølbak K, Krause TG; Omicron-Delta study group. Bager P, et al. Lancet Infect Dis. 2022 Jul;22(7):967-976. doi: 10.1016/S1473-3099(22)00154-2. Epub 2022 Apr 22. Lancet Infect Dis. 2022. PMID: 35468331 Free PMC article.
Introduction and transmission of SARS-CoV-2 lineage B.1.1.7, Alpha variant, in Denmark.
Michaelsen TY, Bennedbæk M, Christiansen LE, Jørgensen MSF, Møller CH, Sørensen EA, Knutsson S, Brandt J, Jensen TBN, Chiche-Lapierre C, Collados EF, Sørensen T, Petersen C, Le-Quy V, Sereika M, Hansen FT, Rasmussen M, Fonager J, Karst SM, Marvig RL, Stegger M, Sieber RN, Skov R, Legarth R, Krause TG, Fomsgaard A; Danish COVID-19 Genome Consortium (DCGC); Albertsen M. Michaelsen TY, et al. Among authors: sieber rn. Genome Med. 2022 May 4;14(1):47. doi: 10.1186/s13073-022-01045-7. Genome Med. 2022. PMID: 35505393 Free PMC article.
Vaccine effectiveness against SARS-CoV-2 infection or COVID-19 hospitalization with the Alpha, Delta, or Omicron SARS-CoV-2 variant: A nationwide Danish cohort study.
Gram MA, Emborg HD, Schelde AB, Friis NU, Nielsen KF, Moustsen-Helms IR, Legarth R, Lam JUH, Chaine M, Malik AZ, Rasmussen M, Fonager J, Sieber RN, Stegger M, Ethelberg S, Valentiner-Branth P, Hansen CH. Gram MA, et al. Among authors: sieber rn. PLoS Med. 2022 Sep 1;19(9):e1003992. doi: 10.1371/journal.pmed.1003992. eCollection 2022 Sep. PLoS Med. 2022. PMID: 36048766 Free PMC article.
Household transmission of the SARS-CoV-2 Omicron variant in Denmark.
Lyngse FP, Mortensen LH, Denwood MJ, Christiansen LE, Møller CH, Skov RL, Spiess K, Fomsgaard A, Lassaunière R, Rasmussen M, Stegger M, Nielsen C, Sieber RN, Cohen AS, Møller FT, Overvad M, Mølbak K, Krause TG, Kirkeby CT. Lyngse FP, et al. Among authors: sieber rn. Nat Commun. 2022 Sep 23;13(1):5573. doi: 10.1038/s41467-022-33328-3. Nat Commun. 2022. PMID: 36151099 Free PMC article.
Household transmission of SARS-CoV-2 Omicron variant of concern subvariants BA.1 and BA.2 in Denmark.
Lyngse FP, Kirkeby CT, Denwood M, Christiansen LE, Mølbak K, Møller CH, Skov RL, Krause TG, Rasmussen M, Sieber RN, Johannesen TB, Lillebaek T, Fonager J, Fomsgaard A, Møller FT, Stegger M, Overvad M, Spiess K, Mortensen LH. Lyngse FP, et al. Among authors: sieber rn. Nat Commun. 2022 Sep 30;13(1):5760. doi: 10.1038/s41467-022-33498-0. Nat Commun. 2022. PMID: 36180438 Free PMC article.
First cases of SARS-CoV-2 BA.2.86 in Denmark, 2023.
Rasmussen M, Møller FT, Gunalan V, Baig S, Bennedbæk M, Christiansen LE, Cohen AS, Ellegaard K, Fomsgaard A, Franck KT, Larsen NB, Larsen TG, Lassaunière R, Polacek C, Qvesel AG, Sieber RN, Rasmussen LD, Stegger M, Spiess K, Tang ME, Vestergaard LS, Andersen TE, Hoegh SV, Pedersen RM, Skov MN, Steinke K, Sydenham TV, Hoppe M, Nielsen L, Krause TG, Ullum H, Jokelainen P. Rasmussen M, et al. Among authors: sieber rn. Euro Surveill. 2023 Sep;28(36):2300460. doi: 10.2807/1560-7917.ES.2023.28.36.2300460. Euro Surveill. 2023. PMID: 37676147 Free PMC article.
Virus isolation and neutralisation of SARS-CoV-2 variants BA.2.86 and EG.5.1.
Lassaunière R, Polacek C, Utko M, Sørensen KM, Baig S, Ellegaard K, Escobar-Herrera LA, Fomsgaard A, Spiess K, Gunalan V, Bennedbæk M, Fonager J, Schwartz O, Planas D, Simon-Lorière E, Schneider UV, Sieber RN, Stegger M, Nielsen L, Hoppe M, Krause TG, Ullum H, Jokelainen P, Rasmussen M. Lassaunière R, et al. Among authors: sieber rn. Lancet Infect Dis. 2023 Dec;23(12):e509-e510. doi: 10.1016/S1473-3099(23)00682-5. Epub 2023 Nov 7. Lancet Infect Dis. 2023. PMID: 37949089 No abstract available.
Emergence and spread of SARS-CoV-2 variants from farmed mink to humans and back during the epidemic in Denmark, June-November 2020.
Rasmussen TB, Qvesel AG, Pedersen AG, Olesen AS, Fonager J, Rasmussen M, Sieber RN, Stegger M, Calvo-Artavia FF, Goedknegt MJF, Thuesen ER, Lohse L, Mortensen S, Fomsgaard A, Boklund A, Bøtner A, Belsham GJ. Rasmussen TB, et al. Among authors: sieber rn. PLoS Pathog. 2024 Jul 1;20(7):e1012039. doi: 10.1371/journal.ppat.1012039. eCollection 2024 Jul. PLoS Pathog. 2024. PMID: 38950065 Free PMC article.
High-resolution epidemiological landscape from  ~290,000 SARS-CoV-2 genomes from Denmark.
Khurana MP, Curran-Sebastian J, Scheidwasser N, Morgenstern C, Rasmussen M, Fonager J, Stegger M, Tang ME, Juul JL, Escobar-Herrera LA, Møller FT; Danish COVID-19 Genome Consortium (DCGC); Albertsen M, Kraemer MUG, du Plessis L, Jokelainen P, Lehmann S, Krause TG, Ullum H, Duchêne DA, Mortensen LH, Bhatt S. Khurana MP, et al. Nat Commun. 2024 Aug 20;15(1):7123. doi: 10.1038/s41467-024-51371-0. Nat Commun. 2024. PMID: 39164246 Free PMC article.
SARS-CoV-2 sequencing artifacts associated with targeted PCR enrichment and read mapping.
Ellegaard KM, Gunalan V, Sieber R, Baig SJ, Larsen NB, Bennedbæk M, Bybjerg-Grauholm J, Escobar-Herrera LA, Gress T, Thorsen TH, Krusager A, Aasbjerg GN, Al-Tamimi NS, Westergaard C, Svarrer CW, Rasmussen M, Stegger M. Ellegaard KM, et al. PLoS One. 2025 Oct 16;20(10):e0334009. doi: 10.1371/journal.pone.0334009. eCollection 2025. PLoS One. 2025. PMID: 41100451 Free PMC article.
Comparative genomics of Staphylococcus aureus strains from wild birds and pig farms elucidates levels of mobilomes, antibiotic pressure and host adaptation.
Abdullahi IN, Lozano C, Zarazaga M, Simón C, Höfle U, Sieber RN, Latorre-Fernández J, Stegger M, Torres C. Abdullahi IN, et al. Among authors: sieber rn. J Glob Antimicrob Resist. 2024 Mar;36:142-150. doi: 10.1016/j.jgar.2023.12.003. Epub 2023 Dec 19. J Glob Antimicrob Resist. 2024. PMID: 38128728 Free article.
Emergence of methicillin resistance predates the clinical use of antibiotics.
Larsen J, Raisen CL, Ba X, Sadgrove NJ, Padilla-González GF, Simmonds MSJ, Loncaric I, Kerschner H, Apfalter P, Hartl R, Deplano A, Vandendriessche S, Černá Bolfíková B, Hulva P, Arendrup MC, Hare RK, Barnadas C, Stegger M, Sieber RN, Skov RL, Petersen A, Angen Ø, Rasmussen SL, Espinosa-Gongora C, Aarestrup FM, Lindholm LJ, Nykäsenoja SM, Laurent F, Becker K, Walther B, Kehrenberg C, Cuny C, Layer F, Werner G, Witte W, Stamm I, Moroni P, Jørgensen HJ, de Lencastre H, Cercenado E, García-Garrote F, Börjesson S, Hæggman S, Perreten V, Teale CJ, Waller AS, Pichon B, Curran MD, Ellington MJ, Welch JJ, Peacock SJ, Seilly DJ, Morgan FJE, Parkhill J, Hadjirin NF, Lindsay JA, Holden MTG, Edwards GF, Foster G, Paterson GK, Didelot X, Holmes MA, Harrison EM, Larsen AR. Larsen J, et al. Among authors: sieber rn. Nature. 2022 Feb;602(7895):135-141. doi: 10.1038/s41586-021-04265-w. Epub 2022 Jan 5. Nature. 2022. PMID: 34987223 Free PMC article.
Genomic characterization and sub-clustering of Escherichia coli clonal complex 38 reveal host associated genetic markers.
Roer L, Rasmussen A, Hansen F, Christoffersen LEB, Sieber R, Scheutz F, Hendriksen RS, Johnston BD, Johnson JR, Holzknecht BJ, Søes L, Schønning K, Holmgaard DB, Justesen US, Østergaard C, Søndergaard TS, Nielsen MTK, Wang M, Nielsen HL, Abraham S, Park DE, Aziz M, Price LB, Hammerum AM, Hasman H, Stegger M. Roer L, et al. Commun Med (Lond). 2026 Jan 26. doi: 10.1038/s43856-026-01402-2. Online ahead of print. Commun Med (Lond). 2026. PMID: 41588103 Free article.
An Endogenous Staphylococcus aureus CRISPR-Cas System Limits Phage Proliferation and Is Efficiently Excised from the Genome as Part of the SCCmec Cassette.
Mikkelsen K, Bowring JZ, Ng YK, Svanberg Frisinger F, Maglegaard JK, Li Q, Sieber RN, Petersen A, Andersen PS, Rostøl JT, Høyland-Kroghsbo NM, Ingmer H. Mikkelsen K, et al. Among authors: sieber rn. Microbiol Spectr. 2023 Aug 17;11(4):e0127723. doi: 10.1128/spectrum.01277-23. Epub 2023 Jul 5. Microbiol Spectr. 2023. PMID: 37404143 Free PMC article.