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Untangling introductions and persistence in COVID-19 resurgence in Europe.

Abstract

. The success in onward transmission of newly introduced lineages was negatively associated with local COVID-19 incidence during this period. The pervasive spread of variants in summer 2020 highlights the threat of viral dissemination when restrictions are lifted, and this needs to be carefully considered by strategies to control the current spread of variants that are more transmissible and/or evade immunity. Our findings indicate that more effective and coordinated measures are required to contain spread through cross-border travel even as vaccination begins to reduce disease burden.

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