title: Analysis of the FoodNet case-control study of sporadic Salmonella serotype Enteritidis infections using persons infected with other Salmonella serotypes as the comparison group.
abstract: 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.
authors.affiliation: Department of Epidemiology, School of Public Health, University of North Carolina, Chapel Hill, NC, USA. aav6@cdc.gov
authors.forename: A C
authors.initials: AC
authors.lastname: Voetsch
authors.forename: C
authors.initials: C
authors.lastname: Poole
authors.forename: C W
authors.initials: CW
authors.lastname: Hedberg
authors.forename: R M
authors.initials: RM
authors.lastname: Hoekstra
authors.forename: R W
authors.initials: RW
authors.lastname: Ryder
authors.forename: D J
authors.initials: DJ
authors.lastname: Weber
authors.forename: F J
authors.initials: FJ
authors.lastname: Angulo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D005260:Female; D005506:Food Contamination; D005516:Food Microbiology; D006801:Humans; D007223:Infant; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D011159:Population Surveillance; D012307:Risk Factors; D012475:Salmonella / Q000302:isolation & purification; D012478:Salmonella Food Poisoning / Q000453:epidemiology* / Q000382:microbiology*; D012477:Salmonella enteritidis / Q000302:isolation & purification*; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology