Note: Now updated daily
data about variants that occur in the current 2019/2020 outbreak.
Nextstrain has a powerful user interface for viewing the timestamped molecular phylogeny tree
that it infers from the patterns of variants in sequences worldwide using the
Nextstrain defines clades named by year and letter, anticipating that SARS-CoV-2 will
become a seasonal virus in the coming years. For more information about the rationale
and properties of current clades, see
The Nextstrain Variants track contains all variants shown on Nextstrain,
of which this track's variants are a very small subset.
Nextstrain downloads SARS-CoV-2 genomes from
as they are submitted by labs worldwide.
Nextstrain identifies variants that define clades of interest and puts them in the file
The genome sequences and metadata including clades.tsv are processed by an
and annotations are written to a data file
that UCSC downloads and extracts annotations for display.
You can download the bigBed file underlying this track (nextstrainClade.bb) from our
Download Server. The data can be explored interactively with the
or the Data Integrator. The data can also be
accessed from scripts through our API.
sharing its analysis of genomes collected by
and to researchers worldwide for sharing their SARS-CoV-2 genome sequences.
Hadfield J, Megill C, Bell SM, Huddleston J, Potter B, Callender C, Sagulenko P, Bedford T, Neher
Nextstrain: real-time tracking of pathogen evolution.
Bioinformatics. 2018 Dec 1;34(23):4121-4123.
PMID: 29790939; PMC: PMC6247931