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Inverse trends of Campylobacter and Salmonella in Swiss surveillance data, 1988–2013
- Claudia Schmutz1,2 , Daniel Mäusezahl1,2 , Marianne Jost3 , Andreas Baumgartner4 , Mirjam Mäusezahl-Feuz3
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View Affiliations Hide AffiliationsAffiliations: 1 Swiss Tropical and Public Health Institute, Basel, Switzerland 2 University of Basel, Basel, Switzerland 3 Swiss Federal Office of Public Health, Bern, Switzerland 4 Swiss Federal Food Safety and Veterinary Office, Bern, SwitzerlandDaniel Mäusezahldaniel.maeusezahl unibas.ch
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Citation style for this article: Schmutz Claudia, Mäusezahl Daniel, Jost Marianne, Baumgartner Andreas, Mäusezahl-Feuz Mirjam. Inverse trends of Campylobacter and Salmonella in Swiss surveillance data, 1988–2013. Euro Surveill. 2016;21(6):pii=30130. https://doi.org/10.2807/1560-7917.ES.2016.21.6.30130 Received: 20 Mar 2015; Accepted: 20 Aug 2015
Abstract
Clinical isolates of Campylobacter spp. and Salmonella spp. are notifiable in Switzerland. In 1995, Campylobacter replaced Salmonella as the most frequently reported food-borne pathogen. We analysed notification data (1988–2013) for these two bacterial, gastrointestinal pathogens of public health importance in Switzerland. Notification rates were calculated using data for the average resident population. Between 1988 and 2013, notified campylobacteriosis cases doubled from 3,127 to 7,499, while Salmonella case notifications decreased, from 4,291 to 1,267. Case notifications for both pathogens peaked during summer months. Campylobacter infections showed a distinct winter peak, particularly in the 2011/12, 2012/13 and 2013/14 winter seasons. Campylobacter case notifications showed more frequent infection in males than females in all but 20–24 year-olds. Among reported cases, patients’ average age increased for campylobacteriosis but not for salmonellosis. The inverse trends observed in case notifications for the two pathogens indicate an increase in campylobacteriosis cases. It appears unlikely that changes in patients’ health-seeking or physicians’ testing behaviour would affect Campylobacter and Salmonella case notifications differently. The implementation of legal microbiological criteria for foodstuff was likely an effective means of controlling human salmonellosis. Such criteria should be decreed for Campylobacter, creating incentives for producers to lower Campylobacter prevalence in poultry.

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