PLoS ONE (Jan 2021)

Origin of imported SARS-CoV-2 strains in The Gambia identified from whole genome sequences.

  • Abdoulie Kanteh,
  • Jarra Manneh,
  • Sona Jabang,
  • Mariama A Kujabi,
  • Bakary Sanyang,
  • Mary A Oboh,
  • Abdoulie Bojang,
  • Haruna S Jallow,
  • Davis Nwakanma,
  • Ousman Secka,
  • Anna Roca,
  • Alfred Amambua-Ngwa,
  • Martin Antonio,
  • Ignatius Baldeh,
  • Karen Forrest,
  • Ahmadou Lamin Samateh,
  • Umberto D'Alessandro,
  • Abdul Karim Sesay

DOI
https://doi.org/10.1371/journal.pone.0241942
Journal volume & issue
Vol. 16, no. 8
p. e0241942

Abstract

Read online

The SARS-CoV-2 disease, first detected in Wuhan, China, in December 2019 has become a global pandemic and is causing an unprecedented burden on health care systems and the economy globally. While the travel history of index cases may suggest the origin of infection, phylogenetic analysis of isolated strains from these cases and contacts will increase the understanding and link between local transmission and other global populations. The objective of this analysis was to provide genomic data on the first six cases of SARS-CoV-2 in The Gambia and to determine the source of infection. This ultimately provide baseline data for subsequent local transmission and contribute genomic diversity information towards local and global data. Our analysis has shown that the SARS-CoV-2 virus identified in The Gambia are of European and Asian origin and sequenced data matched patients' travel history. In addition, we were able to show that two COVID-19 positive cases travelling in the same flight had different strains of SARS-CoV-2. Although whole genome sequencing (WGS) data is still limited in sub-Saharan Africa, this approach has proven to be a highly sensitive, specific and confirmatory tool for SARS-CoV-2 detection.