On 2021-02-01 a superspreading event most likely occurred in Vasterbotten. 4 days later (2021-02-05) it started to super-spread through the community. A total of 48 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 240 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 2021-02-12, 11 days after it started, with 2240 sequences found in total.
The last sequence of the superspreading event was collected on 2021-03-23.
The sequence of this event has been classified as Alpha.