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Table 5 Exposure settings of the Salmonella Enteritidis cases included in the space-time clusters for the six most frequent phage types in Ontario, Canada, 2008-2009

From: Spatial-temporal epidemiology of human Salmonella Enteritidis infections with major phage types (PTs 1, 4, 5b, 8, 13, and 13a) in Ontario, Canada, 2008–2009

Phage type Cluster

Exposure setting

 

Phage type (N)

Region

Cases (n)

Private home (n)

Food premise (n)

International travel (n)

Other setting (n)

Unknown (n)

Missing (n)

PT 1 (N = 132)

North West, North East, Eastern, Central East

20

0

2

7

0

4

7

Central West

16

0

0

4

0

3

9

PT 4 (N = 76)

Eastern, Central East

15

0

0

9

0

1

5

PT 5b (N = 83)

Central West

17

0

0

9

0

4

4

PT 8 (N = 397)

North West

15

0

0

0

0

13

2

South West

21

2

3

1

1

5

9

PT 13 (N = 198)

Toronto

40

2

10

1

1

26

0

PT 13a (N = 218)

Toronto

18

1

7

3

0

7

0

  1. N = number of S. Enteritidis cases with the phage type. n = number of S. Enteritidis cases with the exposure setting. Results based on discrete Poisson models using the SatTScan™ software. Study period: January 1, 2008 to December 31, 2009. Time aggregation units: month. Time aggregation length: 1 month. Circular scanning window size: up to 50 % of the population at risk and 50 % of the study period. Confounders controlled for age (0–9, 10–24, 25–34, 35–49, ≥ 50 years) and sex. Criteria for reporting secondary clusters: no geographical overlap. Type of clusters investigated: high rate only. Exposure settings in the surveillance database were categorized as: international travel (i.e., travelled outside of Canada), private home, food premise (e.g., restaurant, grocery store, bakery, deli, caterer, mobile food premise), or other (e.g., institution, hospital, farm, petting zoo, child care centre)