On 2020-07-21 a superspreading event most likely occurred in United Kingdom. 32 days later (2020-08-22) it started to super-spread through the community. A total of 120 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 269 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 2020-09-04, 45 days after it started, with 32387 sequences found in total.
The last sequence of the superspreading event was collected on 2020-10-16.