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Abstract

Background

is a leading global cause of bacterial gastroenteritis, motivating research to identify sources of human infection. Population genetic studies have been increasingly applied to this end, mainly using multilocus sequence typing (MLST) data.

Objectives

This review aimed to summarise approaches and findings of these studies and identify best practice lessons for this form of genomic epidemiology.

Methods

We systematically reviewed publications using MLST data to attribute human disease isolates to source. Publications were from January 2001, when this type of approach began. Searched databases included Scopus, Web of Science and PubMed. Information on samples and isolate datasets used, as well as MLST schemes and attribution algorithms employed, was obtained. Main findings were extracted, as well as any results’ validation with subsequent correction for identified biases. Meta-analysis is not reported given high levels of heterogeneity.

Results

Of 2,109 studies retrieved worldwide, 25 were included, and poultry, specifically chickens, were identified as principal source of human infection. Ruminants (cattle or sheep) were consistently implicated in a substantial proportion of cases. Data sampling and analytical approaches varied, with five different attribution algorithms used. Validation such as self-attribution of isolates from known sources was reported in five publications. No publication reported adjustment for biases identified by validation.

Conclusions

Common gaps in validation and adjustment highlight opportunities to generate improved estimates in future genomic attribution studies. The consistency of chicken as the main source of human infection, across high income countries, and despite methodological variations, highlights the public health importance of this source.

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2019-10-24
2025-05-01
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A systematic review of source attribution of human campylobacteriosis using multilocus sequence typing
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Alison+J+Cody&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Cody Alison J</a>, <a href="/search?value1=Martin+CJ+Maiden&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Maiden Martin CJ</a>, <a href="/search?value1=Norval+JC+Strachan&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Strachan Norval JC</a>, <a href="/search?value1=Noel+D+McCarthy&option1=author&noRedirect=true" class="nonDisambigAuthorLink">McCarthy Noel D</a></span>. A systematic review of source attribution of human campylobacteriosis using multilocus sequence typing. <a href="/content/ecdc">Euro Surveill.</a> 2019;24(43):pii=1800696. <a href="https://doi.org/10.2807/1560-7917.ES.2019.24.43.1800696" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2019.24.43.1800696</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 19 Dec 2018;&nbsp;&nbsp; <span class="generated">Accepted</span>: 07 Jun 2019 </span> </p>
/content/10.2807/1560-7917.ES.2019.24.43.1800696
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