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Volume 10, Issue 2

Whole-Genome sequencing in routine epidemiology – scoping the potential Open Access

Abstract

the main agent of bovine tuberculosis (bTB), presents as a series of spatially-localised micro-epidemics across landscapes. Classical molecular typing methods applied to these micro-epidemics, based on genotyping a few variable loci, have significantly improved our understanding of potential epidemiological links between outbreaks. However, they have limited utility owing to low resolution. Conversely, whole-genome sequencing (WGS) provides the highest resolution data available for molecular epidemiology, producing richer outbreak tracing, insights into phylogeography and epidemic evolutionary history. We illustrate these advantages by focusing on a common single lineage of (1.140) from Northern Ireland. Specifically, we investigate the spatial sub-structure of 20 years of herd-level multi locus VNTR analysis (MLVA) surveillance data and WGS data from a down sampled subset of isolates of this MLVA type over the same time frame. We mapped 2108 isolate locations of MLVA type 1.140 over the years 2000–2022. We also mapped the locations of 148 contemporary WGS isolates from this lineage, over a similar geographic range, stratifying by single nucleotide polymorphism (SNP) relatedness cut-offs of 15 SNPs. We determined a putative core range for the 1.140 MLVA type and SNP-defined sequence clusters using a 50 % kernel density estimate, using cattle movement data to inform on likely sources of WGS isolates found outside of core ranges. Finally, we applied Bayesian phylogenetic methods to investigate past population history and reproductive number of the 1.140 . lineage. We demonstrate that WGS SNP-defined clusters exhibit smaller core ranges than the established MLVA type - facilitating superior disease tracing. We also demonstrate the superior functionality of WGS data in determining how this lineage was disseminated across the landscape, likely via cattle movement and to infer how its effective population size and reproductive number has been in flux since its emergence. These initial findings highlight the potential of WGS data for routine monitoring of bTB outbreaks.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): Bovine tuberculosis and genome epidemiology
Funding
This study was supported by the:
  • Department of Agriculture, Environment and Rural Affairs, UK Government (Award 21/3/05)
    • Principle Award Recipient: AdrianAllen
© 2024 Crown Copyright
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2024-02-14
2024-05-04
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Whole-Genome sequencing in routine Mycobacterium bovis epidemiology – scoping the potential
M Gen 10, 001185 (2024); https://doi.org/10.1099/mgen.0.001185
/content/journal/mgen/10.1099/mgen.0.001185
/content/journal/mgen/10.1099/mgen.0.001185
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