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Updated: Dec 9, 2025

Author Spotlight: Advancements in Multiplex Detection of Respiratory Viruses
Published on: November 10, 2023
The emergence of SARS-CoV-2 in Europe and North America
Michael Worobey1, Jonathan Pekar2,3, Brendan B Larsen4
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA. worobey@arizona.edu msuchard@ucla.edu jwertheim@health.ucsd.edu philippe.lemey@kuleuven.be.
Abstract:
Accurate understanding of the global spread of emerging viruses is critical for public health responses and for anticipating and preventing future outbreaks. Here we elucidate when, where, and how the earliest sustained severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission networks became established in Europe and North America. Our results suggest that rapid early interventions successfully prevented early introductions of the virus from taking hold in Germany and the United States. Other, later introductions of the virus from China to both Italy and Washington state, United States, founded the earliest sustained European and North America transmission networks. Our analyses demonstrate the effectiveness of public health measures in preventing onward transmission and show that intensive testing and contact tracing could have prevented SARS-CoV-2 outbreaks from becoming established in these regions.
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