Professor and Head
Hong Kong University
The new variant COVID-19 has likely been introduced by travelers from the UK and spreading undetected for months in many countries.
A fast-spreading SARS-CoV-2 variant identified in the United Kingdom in December 2020 has raised international alarm. We estimate that, in 16 out of 19 countries analyzed, there is at least a 50% chance the variant was imported by travelers from the United Kingdom byDecember 7th.