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Science s COVID-19 reporting is supported by the Heising-Simons Foundation
Testing for COVID-19 at Johannesburg s airport in January. A variant of concern that arose in South Africa has spread around the world.
PHOTO: GUILLEM SARTORIO/BLOOMBERG/GETTY IMAGES
Last month, Gytis Dudas was tracking a concerning new coronavirus variant that had triggered an outbreak of COVID-19 in his native Lithuania and appeared sporadically elsewhere in Europe and in the United States. Exploring an international database of coronavirus genomes, Dudas found a crucial clue: One sample of the new SARS-CoV-2 variant came from a person who had recently flown to France from Cameroon. A collaborator, Guy Baele of KU Leuven, soon identified six more viral sequences from people in Europe who had traveled there from Cameroon. But then their quest to pinpoint the variant s origins hit a wall: Cameroon had only uploaded 48 viral genomes to the global sequence repository called GISAID. None included the variant.