Introduction and transmission of SARS-CoV-2 lineage B.1.1.7, Alpha variant, in Denmark
Abstract Background In early 2021, the SARS-CoV-2 lineage B.1.1.7 (Alpha variant) became dominant across large parts of the world.In Denmark, comprehensive and real-time test, contact-tracing, and sequencing efforts were applied to sustain epidemic control.Here, we use these data to investigate the transmissibility, introduction, and onward transmi