On 2021-02-03 a superspreading event most likely occurred in Stockholm. 19 days later (2021-02-22) it started to super-spread through the community. A total of 43 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 271 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 2021-02-26, 23 days after it started, with 8636 sequences found in total.
The last sequence of the superspreading event was collected on 2021-04-23.
The sequence of this event has been classified as Alpha.