On 2021-02-26 a superspreading event most likely occurred in Japan. 3 days later (2021-03-01) it started to super-spread through the community. A total of 40 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 264 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 2021-03-08, 10 days after it started, with 5606 sequences found in total.
The last sequence of the superspreading event was collected on 2021-04-03.
The sequence of this event has been classified as Alpha.