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Truong Nguyen P, Kant R, Van den Broeck F, Suvanto MT, Alburkat H, Virtanen J, Ahvenainen E, Castren R, Hong SL, Baele G, Ahava MJ, Jarva H, Jokiranta ST, Kallio-Kokko H, Kekäläinen E, Kirjavainen V, Kortela E, Kurkela S, Lappalainen M, Liimatainen H, Suchard MA, Hannula S, Ellonen P, Sironen T, Lemey P, Vapalahti O, Smura T. The phylodynamics of SARS-CoV-2 during 2020 in Finland. Commun Med (Lond) 2022; 2:65. [PMID: 35698660 PMCID: PMC9187640 DOI: 10.1038/s43856-022-00130-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Accepted: 05/23/2022] [Indexed: 02/01/2023] Open
Abstract
Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has caused millions of infections and fatalities globally since its emergence in late 2019. The virus was first detected in Finland in January 2020, after which it rapidly spread among the populace in spring. However, compared to other European nations, Finland has had a low incidence of SARS-CoV-2. To gain insight into the origins and turnover of SARS-CoV-2 lineages circulating in Finland in 2020, we investigated the phylogeographic and -dynamic history of the virus. Methods The origins of SARS-CoV-2 introductions were inferred via Travel-aware Bayesian time-measured phylogeographic analyses. Sequences for the analyses included virus genomes belonging to the B.1 lineage and with the D614G mutation from countries of likely origin, which were determined utilizing Google mobility data. We collected all available sequences from spring and fall peaks to study lineage dynamics. Results We observed rapid turnover among Finnish lineages during this period. Clade 20C became the most prevalent among sequenced cases and was replaced by other strains in fall 2020. Bayesian phylogeographic reconstructions suggested 42 independent introductions into Finland during spring 2020, mainly from Italy, Austria, and Spain. Conclusions A single introduction from Spain might have seeded one-third of cases in Finland during spring in 2020. The investigations of the original introductions of SARS-CoV-2 to Finland during the early stages of the pandemic and of the subsequent lineage dynamics could be utilized to assess the role of transboundary movements and the effects of early intervention and public health measures.
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Affiliation(s)
- Phuoc Truong Nguyen
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Ravi Kant
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Frederik Van den Broeck
- Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
- Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Maija T. Suvanto
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Hussein Alburkat
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Jenni Virtanen
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Ella Ahvenainen
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Robert Castren
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Samuel L. Hong
- Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - Guy Baele
- Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - Maarit J. Ahava
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Hanna Jarva
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Translational Immunology Research Program, University of Helsinki, Helsinki, Finland
- Department of Bacteriology and Immunology, University of Helsinki, Helsinki, Finland
| | - Suvi Tuulia Jokiranta
- Translational Immunology Research Program, University of Helsinki, Helsinki, Finland
- Department of Bacteriology and Immunology, University of Helsinki, Helsinki, Finland
| | - Hannimari Kallio-Kokko
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Eliisa Kekäläinen
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Translational Immunology Research Program, University of Helsinki, Helsinki, Finland
| | - Vesa Kirjavainen
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Elisa Kortela
- Infectious Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Satu Kurkela
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Maija Lappalainen
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Hanna Liimatainen
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Marc A. Suchard
- Departments of Biomathematics, Biostatistics and Human Genetics, University of California, Los Angeles (UCLA), Los Angeles, CA USA
| | - Sari Hannula
- Institute for Molecular Medicine Finland (FIMM), Helsinki, Finland
| | - Pekka Ellonen
- Institute for Molecular Medicine Finland (FIMM), Helsinki, Finland
| | - Tarja Sironen
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
| | - Philippe Lemey
- Department of Microbiology, Immunology and Transplantation, Rega Institute, KU Leuven, Leuven, Belgium
| | - Olli Vapalahti
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- Department of Veterinary Biosciences, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Teemu Smura
- Department of Virology, Faculty of Medicine, University of Helsinki, Helsinki, Finland
- HUS Diagnostic Center, HUSLAB, Clinical Microbiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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