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• W2912300913 abstract "Abstract Viral genomes comprising multiple distinct RNA segments can undergo genetic exchange through reassortment, a process that facilitates viral evolution and can have major epidemiological consequences. Segmentation also allows the replication of incomplete viral genomes (IVGs), however, and evidence suggests that IVGs occur frequently for influenza A viruses. Here we quantified the frequency of IVGs using a novel single cell assay and then examined their implications for viral fitness. We found that each segment of influenza A/Panama/2007/99 (H3N2) virus has only a 58% probability of being present in a cell infected with a single virion. These observed frequencies accurately account for the abundant reassortment seen in co-infection, and suggest that an average of 3.7 particles are required for replication of a full viral genome in a cell. This dependence on multiple infection is predicted to decrease infectivity and to slow viral propagation in a well-mixed system. Importantly, however, modeling of spatially structured viral growth predicted that the need for complementation is met more readily when secondary spread occurs locally. This expectation was supported by experimental infections in which the level spatial structure was manipulated. Furthermore, a virus engineered to be entirely dependent on co-infection to replicate in vivo was found to grow robustly in guinea pigs, suggesting that coinfection is sufficiently common in vivo to support propagation of IVGs. The infectivity of this mutant virus was, however, reduced 815-fold relative wild-type and the mutant virus did not transmit to contacts. Thus, while incomplete genomes augment reassortment and contribute to within-host spread, the existence of rare complete IAV genomes may be critical for transmission to new hosts." @default.
• W2912300913 created "2019-02-21" @default.
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• W2912300913 date "2019-01-23" @default.
• W2912300913 modified "2023-09-27" @default.
• W2912300913 title "Incomplete influenza A virus genomes are abundant but readily complemented during spatially structured viral spread" @default.
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• W2912300913 doi "https://doi.org/10.1101/529065" @default.
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