On 2020-09-21 a superspreading event most likely occurred in United Kingdom. 14 days later (2020-10-05) it started to super-spread through the community. A total of 33 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 883 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 2020-10-09, 18 days after it started, with 121019 sequences found in total.
The last sequence of the superspreading event was collected on 2021-01-22.