Fig. 1: Epidemiological properties of viral importation lineages.

A Importation lineages are colored by the corresponding Pango-lineage to which they belong. The size of squares represents the size of the importation lineages. The figure exclusively displays lineages that were not eliminated before 2021-01-01. B Estimated importation time and geographic distribution over states for the six largest B.1.1.7 importation lineages. The colors represent the number of viral genomes belonging to the respective importation lineage for each individual state. The light orange block indicates the time of the Christmas holidays (2020-12-24 to 2021-01-09). The holidays vary by state, starting on 2020-12-24, and ending between 2021-01-02 and 2021-01-09. C Number of importation lineages entered into the country per week, colored by the state that they were first observed in, shown individually for the states with the most importation events (dark pink: North Rhine-Westphalia, pink: Bavaria, dark blue: Baden-Württemberg, blue: Saxony) and for the remaining states in gray. The light orange block denotes the Christmas holidays, from 2020-12-24 to 2021-01-02 until 2021-01-09, depending on the state, and the red arrow indicates the peak in importation events after the Christmas holidays. See Fig. S1 for the results for other samplings. The map represents the percentage of detected importation lineages, first observed in individual states (white: fewer, pink: more). NW = North Rhine-Westphalia, BW = Baden-Württemberg, BY = Bavaria, SN = Saxony.