Seasonal Respiratory Infections and Enteric Outbreaks Surveillance Reports

Current Season: 2018-2019

Current report: December 12 (week 49) [PDF, 615 kb]

This report provides a overview of the current Influenza season in the City of Ottawa, Ontario. For information on the current influenza season across Ontario see the Ontario Respiratory Pathogen Bulletin, and for Canada see the FluWatch report. Regional syndromic surveillance data on Influenza like Illness (ILI), including hospital admissions and emergency department visits, can be accessed through ILI mapper

Past reports from current season

Past Seasons from 2012-2013 to 2017-2018

Download 2012-2013 to 2017-2018 influenza season comparative report (PDF)

Graph of the number of laboratory-confirmed influenza cases in Ottawa, by influenza season, from 2012-2013 to 2017-2018

Graph showing number of lab confirmed influenza cases by flu week. Graph includes six lines depicting influenza cases for the previous six influenza seasons. Data is also summarized in Figure 1 data table

Date ranges for influenza surveillance (flu weeks) weeks change slightly each season. For ease of interpretation, only 2017-2018 flu week date ranges are captured in the epidemiological curve above.

Data
 Figure Data Table

 

2012-2013

2013-2014

2014-2015

2015-2016

2016-2017

2017-2018

27 Aug

0

0

0

0

1

0

03 Sep

0

0

0

0

0

2

10 Sep

0

0

0

0

1

0

17 Sep

0

0

0

0

1

1

24 Sep

0

0

0

3

0

1

01 Oct

0

0

0

0

0

0

08 Oct

0

0

0

1

1

3

15 Oct

3

0

1

1

0

0

22 Oct

0

0

0

1

0

1

 29 Oct

0

2

0

0

1

0

05 Nov

1

0

1

1

2

0

12 Nov

5

0

0

0

1

4

19 Nov

2

0

0

1

2

3

26 Nov

8

4

5

1

5

9

03 Dec

4

7

7

4

10

3

10 Dec

22

6

21

1

14

13

17 Dec

24

24

51

5

42

25

24 Dec

69

33

65

4

60

36

31 Dec

101

47

97

3

61

72

07 Jan

69

45

98

7

50

85

14 Jan

61

30

74

5

39

76

21 Jan

44

20

56

14

34

59

28 Jan

16

11

63

18

38

62

04 Feb

29

16

53

29

35

89

11 Feb

14

6

46

41

28

106

18 Feb

14

6

49

54

25

118

25 Feb

10

4

26

56

27

117

04 Mar

10

5

34

61

16

72

11 Mar

8

13

44

63

25

46

18 Mar

4

12

38

23

12

41

25 Mar

4

10

24

24

19

39

01 Apr

7

9

12

19

11

36

08 Apr

3

12

14

14

12

28

15 Apr

4

17

14

13

11

13

22 Apr

2

12

10

11

14

8

29 Apr

2

7

14

9

7

8

06 May

2

11

2

12

1

5

13 May

0

8

3

2

7

2

20 May

1

18

0

3

2

0

27 May

0

5

0

2

2

0

03 Jun

0

2

1

0

1

1

10 Jun

0

0

0

0

0

0

17 Jun

0

0

0

0

1

0

24 Jun

0

1

0

0

1

0

01 Jul

0

0

1

0

0

0

08 Jul

1

0

0

0

0

0

15 Jul

0

0

0

0

2

0

22 Jul

0

1

0

0

0

0

29 Jul

0

0

0

0

0

0

05 Aug

0

0

0

0

0

1

12 Aug

0

0

0

0

0

1

19 Aug

0

0

0

0

0

1

26 Aug

0

0

0

0

1

0

Dominant Influenza Strain(s) & Key Flu Activity Periods
 

2012 - 2013

2013 - 2014

2014 - 2015

2015 - 2016

2016 - 2017

2017 - 2018

Dominant influenza strain(s)

A/H3N2

A/H1N1

A/H3N2

A/H1N1

A/H3N2

A/H3N2 and B/Phuket (Yamagata lineage)

First week of flu season

Nov 4- Nov 10, 2012*

Dec 1-7, 2013*

Nov 23-29, 2014*

Jan 17-23, 2016*

Nov 27- Dec 3, 2016

Nov 26- Dec 2, 2017

Week of maximum % test-positivity

Dec 23-29, 2012*

Dec 29, 2013 - Jan 4, 2014*

Dec 28, 2014 - Jan 3, 2015*

Mar 6-12, 2016*

Dec 25-31, 2016*

Feb 25- Mar 3, 2018*

Maximum % test-positivity

33.4%*

29.1%*

34.5%*

34.3%*

19.4%

34%

Peak week of flu season±

Dec 31, 2012-Jan 6, 2013

Dec 31, 2013 - Jan 7, 2014

Jan 7-14, 2015

Mar 10-16, 2016

Dec 31, 2016 -Jan 7, 2017

Peak 1: 
Jan 7-14, 2018

Peak 2:
Feb 18-24, 2018

Laboratory-confirmed Influenza Cases
 

2012 - 2013

2013 - 2014

2014 - 2015

2015 - 2016

2016 - 2017

2017 - 2018

Median age

70 years

54 years

78 years

45 years

71 years

72 years

Total flu cases

544

404

924

506

622

1187

Flu A cases (%)

498 (91%)

300 (74%)

769 (83%)

402 (79%)

544 (87%)

689 (58%)

Flu B cases (%)

46 (8%)

104 (26%)

153 (17%)

104 (21%)

78 (12%)

492 (41%)

Hospitalizations

122

106

234

149

113

Not available

Deaths

13

9

27

7

11

21

Institutional Respiratory Outbreak
 

2012 - 2013

2013 - 2014

2014 - 2015

2015 - 2016

2016 - 2017

2017 - 2018

Total respiratory outbreaks

103

73

156

78

132

148

Flu A outbreaks

50

20

91

14

44

42

Flu B outbreaks

4

8

11

3

3

37

Non-influenza outbreaks

49

45

54

61

85

62

Hospitalizations

Not available

Not available

179

17

46

96

Deaths

Not available

Not available

48

5

19

34

Influenza Immunization (flu vaccine)
 

2012 - 2013

2013 - 2014

2014 - 2015

2015 - 2016

2016 - 2017

2017 - 2018

Vaccine doses distributed

353,800

390,640

380,309

379,333

379,241

392,603

Estimated vaccine coverage

38.2%

41.7%

40%

38.9%

38.0%

38.6%

Vaccine effectiveness (95% CI)¥

50%
(33-63%)

68%
(58-76%)

9%
(0-27%)

46%
(32-57%)

45%
(31-56%)

42%
(22-55%)

Archived Seasonal Respiratory Infections and Enteric Outbreaks Surveillance Reports

2017-2018 Influenza Season

Data Notes

The data presented are current as of Sep 1, 2018.  Unless otherwise stated, information included in this table was extracted from the Ministry of Health and Long-Term Care integrated Public Health Information System (iPHIS) database by Ottawa Public Health (OPH). iPHIS is a dynamic disease reporting system that allows for ongoing updates to data previously entered. Data extracted from the iPHIS database represent a snapshot at the time of extraction and can be different in previous or subsequent reports.

Influenza cases and respiratory infection outbreaks in institutions and public hospitals meeting Ontario Ministry of Health and Long-Term Care (MOHLTC) case definitions for Diseases of Public Health Significance (DPHS), according to Ontario Public Health Standards: Requirements for Programs, Services, and Accountability (Standards): Infectious Diseases Protocol, are presented. In the City of Ottawa, laboratory confirmation testing of influenza is performed by Public Health Ontario Labs (PHOL) or Eastern Ontario Regional Laboratory Association (EORLA). Changes to DPHS reporting requirements or case definitions, as well as variability in influenza laboratory testing and reporting algorithms at can limit the ability to compare across influenza seasons.

* Influenza laboratory test-positivity data for influenza seasons prior to the 2016-2017 season are unavailable for the City of Ottawa. Ontario data, available from Public Health Ontario (PHO) and accessed here, are included as proxy measures.

First week when 5% or more of samples submitted for laboratory testing were positive for influenza.

Highest % of samples submitted for testing that were positive for influenza during a single week.

± Week when the highest number of new influenza cases were reported to OPH, by accurate episode date.

Deaths and hospitalizations are limited to line-listed resident or patient cases from influenza outbreaks in institutions and public hospitals. Influenza infections are not confirmed through laboratory testing for all line-listed cases, as per MOHLTC reporting case definitions. Generally, up to four sample are tested, the remaining outbreak cases are assumed to be caused by the same respiratory pathogen.

Flu vaccination coverage estimates are based on the number of vaccine doses distributed by OPH each season. Vaccine coverage = number of vaccine doses distributed / Ottawa population estimates for 2018 *100

¥ Flu vaccine effectiveness data are based on the Canadian Sentinel Practitioner Surveillance Network (SPSN) influenza vaccine effectiveness estimates accessed here.

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