SARS-CoV-2 Introductions into Lao PDR Revealed by Genomic Surveillance, 2021-2024
Panapruksachat, S.; Troupin, C.; Souksavanh, M.; Keeratipusana, C.; Vongsouvath, M.; Vongphachanh, S.; Vongsouvath, M.; Phommasone, K.; Somlor, S.; Robinson, M. T.; Chookajorn, T.; Kochakarn, T.; Day, N. P.; Mayxay, M.; Letizia, A. G.; Dubot-Peres, A.; Ashley, E. A.; Buchy, P.; Xangsayarath, P.; Batty, E. M.
Show abstract
We used 2492 whole genome sequences from Laos to investigate the molecular epidemiology of SARS-CoV-2 from 2021 through 2024, covering the major waves of COVID-19 disease in Laos including time periods of travel restrictions and after relaxation of travel across international borders. We identify successive waves of COVID-19 caused by shifts in the dominant lineage, beginning with the Alpha variant in April 2021 and continuing through the Delta and Omicron variants. We quantify a shift from a small number of viral introductions responsible for widespread transmission in early waves to a larger number of introductions for each variant after travel restrictions were lifted, and identify potential routes of introduction into the country. Our study underscores the importance of genomic surveillance to public health responses to characterize viral transmission dynamics during pandemics.
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