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. 2021 Sep 23;7(2):veab086. doi: 10.1093/ve/veab086

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© The Author(s) 2021. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 3. — Imports and transmission clusters in Norway. (A) Dated phylogeny generated using the NextStrain pipeline used to infer imports to and local transmission of SARS-CoV-2 in Norway. The B.1.1.7 lineage is colored purple. The last 4 weeks of sampling are shaded grey as there is more uncertainty around these estimates (see main text). B) Weekly relative import frequencies of B.1.1.7 versus non-B.1.1.7 are plotted in the top panel. Individual imports are plotted in the bottom lineage as a function of the estimated TMRCA of each import lineage and the size of the cluster (i.e. the number of sequenced isolates in Norway inferred to be the result of each import). The dashed lines mark the implementation date for key interventions: (1) mandatory testing at the border and (2) closure of the border for individuals not residing in Norway.