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Volume 27, Number 12—December 2021
Dispatch

Incidence Trends for SARS-CoV-2 Alpha and Beta Variants, Finland, Spring 2021

Ravi Kant1, Phuoc Truong Nguyen1, Soile Blomqvist, Mert Erdin, Hussein Alburkat, Maija Suvanto, Fathiah Zakham, Veera Salminen, Viktor Olander, Minna Paloniemi, Leena Huhti, Sara Lehtinen, Bruno Luukinen, Hanna Jarva, Hannimari Kallio-Kokko, Satu Kurkela, Maija Lappalainen, Hanna Liimatainen, Sari Hannula, Jani Halkilahti, Jonna Ikonen, Niina Ikonen, Otto Helve, Marianne Gunell, Tytti Vuorinen, Ilya Plyusnin, Erika Lindh, Pekka Ellonen, Tarja Sironen, Carita Savolainen-Kopra, Teemu SmuraComments to Author , and Olli VapalahtiComments to Author 
Author affiliations: University of Helsinki, Helsinki, Finland (R. Kant, P. Truong Nguyen, M. Erdin, H. Alburkat, M. Suvanto, F. Zakham, V. Salminen, V. Olander, H. Jarva, I. Plyusnin, T. Sironen, T. Smura, O. Vapalahti); Finnish Institute for Health and Welfare (THL), Helsinki (S. Blomqvist, J. Halkilahti, J. Ikonen, N. Ikonen, O. Helve, E. Lindh, C. Savolainen-Kopra); Fimlab Laboratories Ltd., Tampere, Finland (M. Paloniemi, L. Huhti, S. Lehtinen, B. Luukinen); HUS Diagnostic Center, University of Helsinki and Helsinki University Hospital, Uusimaa, Finland (H. Jarva, H. Kallio-Kokko, S. Kurkela, M. Lappalainen, H. Liimatainen, T. Smura, O. Vapalahti); Institute for Molecular Medicine Finland (FIMM), Helsinki (S. Hannula, P. Ellonen); Turku University Hospital, Turku, Finland (M. Gunell, T. Vuorinen)

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Figure 2

Phylogenetic trees of severe acute respiratory syndrome coronavirus 2 Beta (B1.351) variant clusters from Finland and sequence distribution. The tree (A) shows 76 clusters with ≥5 sequences (red circles), of which 48 contain 898 sequences sampled in Finland using TreeCluster (11), and 23 Finland singletons (white circles) from 33. The tree was constructed by using IQ-TREE 2 (10) with 1,000 ultrafast bootstraps. Each row in subsequent panels is equivalent to a cluster and shows the number of sequences from Finland (B) and the proportion of sequences per region of from Finland (C). Regions of Finland: 1, Central Finland Health Care District; 2, East Savo Hospital District; 3, Hospital District of Helsinki and Uusimaa; 4, Hospital District of South Ostrobothnia; 5, Hospital District of Southwest Finland; 6, Kainuu Social and Health Care Joint Authority; 7, Kanta-Häme Hospital District; 8, Länsi-Pohja Healthcare District; 9, Lapland Hospital District; 10, North Karelia Hospital District; 11, North Ostrobothnia Hospital District; 12, North Savo Hospital District; 13, Päijät-Häme Hospital District; 14, Pirkanmaa Hospital District; 15, Satakunta Hospital District; 16, Social and Health Services in Kymenlaakso; 17, South Karelia Social and Health Care District; 18, South Savo Hospital District; 19, Vaasa Hospital District,

Figure 2. Phylogenetic trees of severe acute respiratory syndrome coronavirus 2 Beta (B1.351) variant clusters from Finland and sequence distribution. The tree (A) shows 76 clusters with ≥5 sequences (red circles), of which 48 contain 898 sequences sampled in Finland using TreeCluster (11), and 23 Finland singletons (white circles) from 33. The tree was constructed by using IQ-TREE 2 (10) with 1,000 ultrafast bootstraps. Each row in subsequent panels is equivalent to a cluster and shows the number of sequences from Finland (B) and the proportion of sequences per region of from Finland (C). Regions of Finland: 1, Central Finland Health Care District; 2, East Savo Hospital District; 3, Hospital District of Helsinki and Uusimaa; 4, Hospital District of South Ostrobothnia; 5, Hospital District of Southwest Finland; 6, Kainuu Social and Health Care Joint Authority; 7, Kanta-Häme Hospital District; 8, Länsi-Pohja Healthcare District; 9, Lapland Hospital District; 10, North Karelia Hospital District; 11, North Ostrobothnia Hospital District; 12, North Savo Hospital District; 13, Päijät-Häme Hospital District; 14, Pirkanmaa Hospital District; 15, Satakunta Hospital District; 16, Social and Health Services in Kymenlaakso; 17, South Karelia Social and Health Care District; 18, South Savo Hospital District; 19, Vaasa Hospital District,

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1These authors contributed equally to this article.

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Page updated: November 19, 2021
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