E-Mail IMAGE: In this example of UShER results, displayed using Nextstrain, sequences representing a hypothetical outbreak are yellow, previously sampled sequences are blue, and branches are labeled by nucleotide mutations. view more Credit: UC Santa Cruz Genomics Institute The COVID-19 pandemic has spurred genomic surveillance of viruses on an unprecedented scale, as scientists around the world use genome sequencing to track the spread of new variants of the SARS-CoV-2 virus. The rapid accumulation of viral genome sequences presents new opportunities for tracing global and local ...