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Time-series analysis of Campylobacter incidence in Switzerland

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2015
Author Wei Wei, Schüpbach Gertraud, Held Leonhard,
Project Statistical methods for spatio-temporal modelling and prediction of infectious diseases
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Original article (peer-reviewed)

Journal Epidemiology and Infection
Volume (Issue) 143
Page(s) 1982 - 1989
Title of proceedings Epidemiology and Infection
DOI 10.1017/S0950268814002738


Campylobacteriosis has been the most common food-associated notifiable infectious disease in Switzerland since 1995. Contact with and ingestion of raw or undercooked broilers are considered the dominant risk factors for infection. In this study, we investigated the temporal relationship between the disease incidence in humans and the prevalence of Campylobacter in broilers in Switzerland from 2008 to 2012. We use a time-series approach to describe the pattern of the disease by incorporating seasonal effects and autocorrelation. The analysis shows that prevalence of Campylobacter in broilers, with a 2-week lag, has a significant impact on disease incidence in humans. Therefore Campylobacter cases in humans can be partly explained by contagion through broiler meat. We also found a strong autoregressive effect in human illness, and a significant increase of illness during Christmas and New Year's holidays. In a final analysis, we corrected for the sampling error of prevalence in broilers and the results gave similar conclusions.