Unique Clusters of Severe Acute Respiratory Syndrome Coronavirus 2 Causing a Large Coronavirus Disease 2019 Outbreak in Hong Kong

Clin Infect Dis. 2021 Jul 1;73(1):137-142. doi: 10.1093/cid/ciaa1119.


After 2 months of relative quiescence, a large coronavirus disease 2019 outbreak occurred in Hong Kong in July 2020 after gradual relaxation of social distancing policy. Unique severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) phylogenetic clusters have been identified among locally acquired cases, with most genomes belonging to cluster HK1, which is phylogenetically related to SARS-CoV-2 reported overseas.

Keywords: COVID-19; SARS-CoV-2; outbreak; whole-genome sequencing.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • COVID-19*
  • Disease Outbreaks
  • Hong Kong
  • Humans
  • Phylogeny
  • SARS-CoV-2*