On 2020-03-02 a superspreading event most likely occurred in New York. 2 days later (2020-03-04) it started to super-spread through the community. A total of 363 copies of this genome (that represents the core of the outbreak), were reported in Gisaid, a proxy for primary transmissions, along with 537 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 2020-04-06, 34 days after it started, with 20164 sequences found in total.
The last sequence of the superspreading event was collected on 2021-03-13.