On 2021-01-22 a superspreading event most likely occurred in USA. 28 days later (2021-02-19) it started to super-spread through the community. A total of 75 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 1259 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 2021-03-01, 38 days after it started, with 202114 sequences found in total.
The last sequence of the superspreading event was collected on 2021-05-06.
The sequence of this event has been classified as Alpha.