Sequences seen: 1
First seen on: 2023-03-07
Last seen on: 2023-03-07
More data on outbreak.info: https://outbreak.info/situation-reports/XBB.1.21
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.