On 2020-09-08 a superspreading event most likely occurred in England. 15 days later (2020-09-23) it started to super-spread through the community. A total of 79 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 162 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 2020-10-03, 25 days after it started, with 12651 sequences found in total.
The last sequence of the superspreading event was collected on 2020-10-07.