The Early Evolution of Oral Poliovirus Vaccine Is Shaped by Strong Positive Selection and Tight Transmission Bottlenecks
- PMID: 33212020
- PMCID: PMC7815045
- DOI: 10.1016/j.chom.2020.10.011
The Early Evolution of Oral Poliovirus Vaccine Is Shaped by Strong Positive Selection and Tight Transmission Bottlenecks
Abstract
The emergence of circulating vaccine-derived polioviruses through evolution of the oral polio vaccine (OPV) poses a significant obstacle to polio eradication. Understanding the early genetic changes that occur as OPV evolves and transmits is important for preventing future outbreaks. Here, we use deep sequencing to define the evolutionary trajectories of type 2 OPV in a vaccine trial. By sequencing 497 longitudinal stool samples from 271 OPV2 recipients and household contacts, we were able to examine the extent of convergent evolution in vaccinated individuals and the amount of viral diversity that is transmitted. In addition to rapid reversion of key attenuating mutations, we identify strong selection at 19 sites across the genome. We find that a tight transmission bottleneck limits the onward transmission of these early adaptive mutations. Our results highlight the distinct evolutionary dynamics of live attenuated virus vaccines and have important implications for the success of next-generation OPV.
Keywords: evolution; live vaccines; poliovirus; sequencing; transmission bottlenecks; vaccine evolution.
Copyright © 2020 The Authors. Published by Elsevier Inc. All rights reserved.
Conflict of interest statement
Declaration of Interests The authors declare no competing interests.
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Comment in
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Mutation, Selection, and Bottlenecks in Polio Vaccine Reversion.Cell Host Microbe. 2021 Jan 13;29(1):3-5. doi: 10.1016/j.chom.2020.12.018. Cell Host Microbe. 2021. PMID: 33444554
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