Analysis of the FoodNet case-control study of sporadic Salmonella serotype Enteritidis infections using persons infected with other Salmonella serotypes as the comparison group

Use of well persons as the comparison group for laboratory-confirmed cases of sporadic salmonellosis may introduce ascertainment bias into case-control studies. Data from the 1996–1997 FoodNet case-control study of laboratory-confirmed Salmonella serogroups B and D infection were used to estimate th...

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Bibliographic Details
Published in:Epidemiology and infection 2009-03, Vol.137 (3), p.408-416
Main Authors: VOETSCH, A. C., POOLE, C., HEDBERG, C. W., HOEKSTRA, R. M., RYDER, R. W., WEBER, D. J., ANGULO, F. J.
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Case control studies
Child
Child, Preschool
Diarrhea
Eggs
epidemiological methods
Epidemiology
Female
Food Contamination
Food Microbiology
Foodborne illnesses
Humans
Infant
Infections
International travel
Logistic Models
Male
Middle Aged
Population Surveillance
Predisposing factors
Risk Factors
Salmonella
Salmonella - isolation & purification
Salmonella enteritidis - isolation & purification
Salmonella Food Poisoning - epidemiology
Salmonella Food Poisoning - microbiology
Salmonella infections
Surveys and Questionnaires
United States - epidemiology
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Summary:Use of well persons as the comparison group for laboratory-confirmed cases of sporadic salmonellosis may introduce ascertainment bias into case-control studies. Data from the 1996–1997 FoodNet case-control study of laboratory-confirmed Salmonella serogroups B and D infection were used to estimate the effect of specific behaviours and foods on infection with Salmonella serotype Enteritidis (SE). Persons with laboratory-confirmed Salmonella of other serotypes acted as the comparison group. The analysis included 173 SE cases and 268 non-SE controls. SE was associated with international travel, consumption of chicken prepared outside the home, and consumption of undercooked eggs prepared outside the home in the 5 days prior to diarrhoea onset. SE phage type 4 was associated with international travel and consumption of undercooked eggs prepared outside the home. The use of ill controls can be a useful tool in identifying risk factors for sporadic cases of Salmonella.
ISSN:0950-2688
1469-4409
DOI:10.1017/S0950268808000897