On 2021-01-02 a superspreading event most likely occurred in Sweden. 37 days later (2021-02-08) it started to super-spread through the community. A total of 49 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 516 genomes that are one-step mutation with respect to the core genome (a proxy for secondary transmissions). The signature for the likely superspreading event ends at about 2021-02-13, 42 days after it started, with 31262 sequences found in total.
The last sequence of the superspreading event was collected on 2021-04-22.
The sequence of this event has been classified as Alpha.