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Competition between transmission lineages mediated by human mobility shapes seasonal influenza epidemics in the US
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Competition between transmission lineages mediated by human mobility shapes seasonal influenza epidemics in the US
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Journal Article
Competition between transmission lineages mediated by human mobility shapes seasonal influenza epidemics in the US
2025
Overview
Due to its climatic variability, complex mobility networks and geographic expanse, the United States represents a compelling setting to explore the transmission processes that lead to heterogeneous yearly seasonal influenza epidemics. By analyzing genomic and epidemiological data collected in the US from 2014 to 2023, we show that epidemics consisted of multiple co-circulating transmission lineages that could emerge from all regions and often rapidly expanded. Lineage spread was characterized by strong spatiotemporal hierarchies and lineage size correlated with timing of establishment in the US. Mechanistic epidemic simulations, supported by phylogeographic analyses, suggest that competition between lineages on a network of human mobility consistent with commuting flows drove lineage dynamics. Our results suggest that the processes that disseminate viruses nationwide are highly structured, but variability in the short-term processes that determine the locations, timing, and explosiveness of initial epidemic sparks limits predictability of regional and national epidemics.
Leveraging genomic and epidemiological surveillance data, the authors show that flu epidemics in the US arise from independent outbreaks in different states that spread from state to state through commuting and compete for susceptible hosts.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
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