Sequences seen: 495
First seen on: 2021-06-21
Last seen on: 2021-12-05
More data: https://outbreak.info/situation-reports?pango=AY.4.1
Note: In the above data, "seen" refers to the date the sample was collected, unless that date was not provided for a sequence, in which case it refers to the date it was submitted to NCBI.