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Abstract

An acute gastroenteritis (AG) outbreak occurred among participants in an obstacle race in France in the summer of 2015. An investigation in two phases was conducted to identify the source of infection and document the extent of the outbreak. First, a message on a social media website asked racers to report any symptoms by email to the Regional Health Agency of Provence-Alpes-Côte d’Azur. Second, a retrospective cross-sectional study was conducted through an interactive questionnaire for all participants, followed by an analytical study of potential risks factors. Of 8,229 persons registered, 1,264 adults reported AG resolved within 48 hours. Of adults who reported AG, 866 met the case definition. Age group, departure time and ingestion of mud were associated with AG. Twenty stool specimens tested negative for bacteria. All four stool samples tested for viruses were positive for norovirus genogroup I and genotype 2. No indicator bacteria for faecal contamination were found in drinking water but muddy water of ponds tested positive. The outbreak was possibly caused by human-to-human transmission of a norovirus introduced by one or more persons and transmitted through contaminated mud. Risks related to similar races should be assessed and recommendations be proposed to raise awareness among health authorities and organisers.

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/content/10.2807/1560-7917.ES.2016.21.23.30253
2016-06-09
2024-11-21
http://instance.metastore.ingenta.com/content/10.2807/1560-7917.ES.2016.21.23.30253
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Outbreak of diarrhoeal illness in participants in an obstacle adventure race, Alpes-Maritimes, France, June 2015
<p class="citation"> <span>Citation style for this article:</span> <span class="meta-value authors"> <a href="/search?value1=Caroline+Six&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Six Caroline</a>, <a href="/search?value1=Samer+Aboukais&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Aboukais Samer</a>, <a href="/search?value1=Sandra+Giron&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Giron Sandra</a>, <a href="/search?value1=Jean-Christophe+D%E2%80%99Oliveira&option1=author&noRedirect=true" class="nonDisambigAuthorLink">D’Oliveira Jean-Christophe</a>, <a href="/search?value1=Fran%C3%A7oise+Peloux-Petiot&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Peloux-Petiot Françoise</a>, <a href="/search?value1=Florian+Franke&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Franke Florian</a>, <a href="/search?value1=Herv%C3%A9+Terrien&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Terrien Hervé</a>, <a href="/search?value1=Fabrice+Dassonville&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Dassonville Fabrice</a>, <a href="/search?value1=Jo%C3%ABl+Deniau&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Deniau Joël</a>, <a href="/search?value1=Katia+Ambert-Balay&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Ambert-Balay Katia</a>, <a href="/search?value1=Thierry+Chesnot&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Chesnot Thierry</a>, <a href="/search?value1=Raymond+Ruimy&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Ruimy Raymond</a>, <a href="/search?value1=Michel+P%C3%A9landakis&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Pélandakis Michel</a>, <a href="/search?value1=Patrick+Basset&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Basset Patrick</a>, <a href="/search?value1=Manuel++Munoz+Rivero&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Munoz Rivero Manuel </a>, <a href="/search?value1=Philippe+Malfait&option1=author&noRedirect=true" class="nonDisambigAuthorLink">Malfait Philippe</a></span>. Outbreak of diarrhoeal illness in participants in an obstacle adventure race, Alpes-Maritimes, France, June 2015. <a href="/content/ecdc">Euro Surveill.</a> 2016;21(23):pii=30253. <a href="https://doi.org/10.2807/1560-7917.ES.2016.21.23.30253" title="doi link" target="_blank">https://doi.org/10.2807/1560-7917.ES.2016.21.23.30253</a> <span class="ES_Article_citation"> <span class="generated">Received</span>: 08 Sept 2015;&nbsp;&nbsp; <span class="generated">Accepted</span>: 17 Feb 2016 </span> </p>
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