Abstract
Community incidence estimates are necessary to assess the burden and impact of infections on health and to set priorities for surveillance, research, prevention, and control strategies. The current study was performed to estimate the community incidence of campylobacteriosis and nontyphoidal salmonellosis in France from the number of laboratory-confirmed cases reported to the national reference center (NRC). The probabilities of a case in the community visiting a doctor, having a stool sample requested, having a positive laboratory test, and having the case reported to the NRC were estimated using data of national surveillance systems, national hospitalization and health insurance databases, and specific surveys informing about these parameters. Credible intervals (CrI) were calculated using Monte Carlo simulation. In addition, we estimated the number of hospitalizations for both infections in France. The annual community incidence rate in France is estimated at 842 cases per 100,000 (90%CrI 525-1690) for campylobacteriosis and 307 cases per 100,000 (90%CrI 173-611) for salmonellosis. The annual number of hospitalizations is estimated at 5182 for campylobacteriosis and 4305 for salmonellosis. The multiplication factors between cases ascertained by the surveillance system and cases in the community were 115 for campylobacteriosis and 20 for salmonellosis. They are consistent with estimates reported in other countries, indicating a high community incidence of campylobacteriosis and salmonellosis in France.
Highlights
In France, Campylobacter and non-typhoidal Salmonella were estimated to be the two main causes of bacterial foodborne infection and hospitalisation (Vaillant et al, 2004)
We estimated that 528,780 cases (90%CrI 329,745–1,060,616) of campylobacteriosis and 192,450 cases (90%CrI 108,445–383,362) of salmonellosis occur each year in France
The multiplication factors between cases ascertained through surveillance and cases in the community were 115 for campylobacteriosis and 20 for salmonellosis
Summary
In France, Campylobacter and non-typhoidal Salmonella (hereafter referred to as Salmonella) were estimated to be the two main causes of bacterial foodborne infection and hospitalisation (Vaillant et al, 2004) Surveillance of both infections is based on two national reference centres (NRC) and their laboratory networks (King et al, 2012, Jones et al, 2014). These laboratory based surveillance systems depend on cases seeking medical care, having a stool sample prescribed, submitting a stool sample to the laboratory for microbiological testing, the identification of the pathogen, and the reporting of laboratory confirmed cases or submission of isolates for confirmation to the NRC They allow us to monitor trends in incidence, human and microbiological characteristics, but not provide the number of cases that occur in the community, as only a fraction of the cases is reported. We estimated the number of hospitalisations for both infections
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