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

A. C. Voetsch, C. Poole, C. W. Hedberg, R. M. Hoekstra, R. W. Ryder, D. J. Weber, F. J. Angulo

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)408-416
Number of pages9
JournalEpidemiology and infection
Volume137
Issue number3
DOIs
StatePublished - 2009

Keywords

  • Case-control studies
  • Epidemiological methods
  • Salmonella infections

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