Module 1 – Epi Summary Example

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Preliminary information and subject to change throughout the day – not for distribution

Case study: [2014-175] E. coli O157:H7 in MB, SK and AB

Epidemiologic Summary, July 21, 2014 14:00 EDT

  Confirmed cases (n=6)

P/T Case Count

AB

MB

SK

 

1

2

3

Age (years)

Range

Mean

Median

 

7–82

37.5

31

Sex:  % female 67% (4/6)
Hospitalizations 25% (1/4)
Deaths 0% (0/4)
Onset date  range June 28 to July 4, 2014
PFGE pattern ECXAI.1398/ECBNI.1212

 

Exposure Summary: 

  • Alberta (n=1): No travel outside the province during incubation period. Case reports eating hamburgers (well done) at friend’s house, grilled chicken, and various salads. Case has a dog.
  • Saskatchewan reports (n=3): two cases attended the same BBQ on Canada Day (July 1), both ate hamburgers and various salads at the event; cases are not from the same household. The third case was hospitalized, has no connection to the BBQ, but also reports eating hamburgers and salads prior to onset.
  • Manitoba (n=2): no exposure information available.

A bar graph. The Y axis shows the number of confirmed cases, and ranges from 1 to 5. The X axis shows dates of illness onset that range from June 21 to July 31. One case from Manitoba appears on June 28. One case from Saskatchewan appears on July 1. Two cases, one from Saskatchewan and one from Manitoba appear on July 3. Two cases, one from Alberta and one from Saskatchewan appear on July 4.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Case definitions:

Confirmed case: A resident or visitor to Canada with

  • Laboratory confirmation of coli O157:H7 AND
  • PFGE pattern combination ECXAI.1398/ECBNI.1212 AND
  • Symptom onset or laboratory confirmation on or after June 1, 2014

 

Probable case: A resident or visitor to Canada with

  • Laboratory confirmation of coli O157:H7 AND
  • PFGE pending AND
  • Symptom onset or laboratory confirmation on or after June 1, 2014

 

Suspect case: A resident or visitor to Canada with

  • Symptoms* consistent with coli O157:H7 infection AND
  • An epidemiological link to a confirmed case AND
  • Symptom onset on or after June 1, 2014

*Diarrhea (three or more loose stools within 24 hours)

Prepared by Centre for Foodborne, Environmental and Zoonotic Infectious Diseases, Outbreak Management Division, (CFEZID/OMD). This information is shared in confidence, further distribution should be done only in accordance with the Foodborne Illness Outbreak Response Protocol.