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Table 1 Proportion of gastrointestinal illnesses excluded from source attribution analyses

From: A descriptive study of reportable gastrointestinal illnesses in Ontario, Canada, from 2007 to 2009

Reportable disease All reported cases: exclusions (%)
  N Not followed up Multiple exposures No primary source** No primary setting†
Amebiasis 2,134 54.3% 0.1% 0.7% 1.4%
Botulism 10 10.0% 0.0% 0.0% 10.0%
Campylobacteriosis 10,916 39.1% 1.2% 2.4% 4.9%
Cryptosporidiosis 1,048 20.9% 1.7% 3.6% 5.8%
Cyclosporiasis 341 15.8% 1.8% 1.5% 2.1%
Giardiasis 4,726 39.4% 0.6% 2.8% 3.8%
Hepatitis A 354 15.0% 2.8% 0.6% 4.2%
Listeriosis 189 19.6% 17.5% 3.2% 3.7%
Paratyphoid Fever 147 3.4% 0.0% 3.4% 0.0%
Salmonellosis 7,514 23.1% 2.0% 0.7% 3.9%
Shigellosis 727 13.1% 1.8% 1.0% 1.4%
Typhoid fever 259 3.9% 0.4% 0.0% 0.0%
VTEC-illness 760 17.4% 7.2% 4.7% 7.6%
Yersiniosis 772 27.1% 1.4% 0.6% 2.5%
Total 29,897 32.9% 1.5% 1.9% 4.1%
  1. ** Unable to classify the most likely source (based on case follow-up).
  2. † Unable to classify the most likely setting where exposure took place (based on case follow-up).