Fig. 2

Early introduction of B.1.1.7 and onwards transmission between Danish regions. A Time-adjusted phylogenetic tree. Tree branches and non-Danish sequences are colored gray. First sequence in a transmission lineage is used to infer time of importation and highlighted with a black circle. B, C A focused temporal analysis of the CA1 introduction lineage, focusing on descending clusters with more than 5 cases. B The temporal span and dynamics of onwards transmission across regions. Each descendent transmission cluster of CA1 is indicated with a solid horizontal line, with points at each week sized according to the number of cases. The vertical curved arrows indicate direction of transmission. The marginal probability of the observed transmission link is indicated at each arrow. In C, the corresponding cases are placed on a map of Denmark using black points, with up to 5 km of random jitter added. Cases from the same transmission cluster are linked by black lines to their centroid location indicated by a red dot. Labels indicate cluster IDs