FluWatch report: September 25 to October 8, 2016 (weeks 39-40)
Overall Summary
- Influenza activity is at interseasonal levels with the majority of regions of Canada reporting no influenza activity.
- Since week 35, the majority of influenza activity has been reported in Western regions of Canada.
- A total of 127 positive influenza detections were reported in weeks 39 and 40. Influenza A(H3N2) was the most common subtype detected and the majority of detections were in adults ≥65 years of age.
- In weeks 39 and 40, approximately 1.0% of visits to sentinel healthcare professionals were due to ILI.
- A total of six laboratory-confirmed influenza outbreaks were reported all of which occurred in week 39.
- Low numbers of hospitalizations and no deaths were reported in weeks 39 and 40.
- For more information on the flu, see our Flu(influenza) web page.
On this page
- Influenza/Influenza-like Illness (ILI) Activity (geographic spread)
- Laboratory Confirmed Influenza Detections
- Syndromic/Influenza-like Illness Surveillance
- Influenza Outbreak Surveillance
- Provincial/Territorial Influenza Hospitalizations and Deaths
- Sentinel Hospital Influenza Surveillance
- Influenza Strain Characterizations
- Antiviral Resistance
- Provincial and International Influenza Reports
- FluWatch definitions for the 2016-2017 season
Influenza/Influenza-like Illness (ILI) Activity (geographic spread)
Organization: Public Health Agency of Canada
Date published: 2016-10-14
Related Topics
In weeks 39 and 40 the majority of regions experienced sporadic or no activity. In week 39, four regions experienced localized activity while in week 40 no regions experienced localized activity. The majority of activity in both weeks 39 and 40 was reported in Western regions of Canada. Additional information on specific regions is available by clicking on the map below.
Laboratory Confirmed Influenza Detections
In weeks 39-40, the percentage of tests positive for influenza remained at interseasonal levels, with 2.5% of tests positive in week 39 and 2.3% in week 40. Data on other respiratory virus detections are available in the Respiratory Virus Detections in Canada Report.
Figure 2 - Text Description
Report Week | A(Unsubtyped) | A(H3) | A(H1)pdm09 | Influenza B |
---|---|---|---|---|
35 | 0 | <5 | 0 | 0 |
36 | <5 | 0 | <5 | 9 |
37 | <5 | 17 | 0 | <5 |
38 | 11 | 28 | <5 | <5 |
39 | 27 | 38 | <5 | 7 |
40 | 13 | 45 | <5 | 0 |
41 | 0 | 0 | 0 | 0 |
42 | 0 | 0 | 0 | 0 |
43 | 0 | 0 | 0 | 0 |
44 | 0 | 0 | 0 | 0 |
45 | 0 | 0 | 0 | 0 |
46 | 0 | 0 | 0 | 0 |
47 | 0 | 0 | 0 | 0 |
48 | 0 | 0 | 0 | 0 |
49 | 0 | 0 | 0 | 0 |
50 | 0 | 0 | 0 | 0 |
51 | 0 | 0 | 0 | 0 |
52 | 0 | 0 | 0 | 0 |
1 | 0 | 0 | 0 | 0 |
2 | 0 | 0 | 0 | 0 |
3 | 0 | 0 | 0 | 0 |
4 | 0 | 0 | 0 | 0 |
5 | 0 | 0 | 0 | 0 |
6 | 0 | 0 | 0 | 0 |
7 | 0 | 0 | 0 | 0 |
8 | 0 | 0 | 0 | 0 |
9 | 0 | 0 | 0 | 0 |
10 | 0 | 0 | 0 | 0 |
11 | 0 | 0 | 0 | 0 |
12 | 0 | 0 | 0 | 0 |
13 | 0 | 0 | 0 | 0 |
14 | 0 | 0 | 0 | 0 |
15 | 0 | 0 | 0 | 0 |
16 | 0 | 0 | 0 | 0 |
17 | 0 | 0 | 0 | 0 |
18 | 0 | 0 | 0 | 0 |
19 | 0 | 0 | 0 | 0 |
20 | 0 | 0 | 0 | 0 |
21 | 0 | 0 | 0 | 0 |
22 | 0 | 0 | 0 | 0 |
23 | 0 | 0 | 0 | 0 |
24 | 0 | 0 | 0 | 0 |
25 | 0 | 0 | 0 | 0 |
26 | 0 | 0 | 0 | 0 |
27 | 0 | 0 | 0 | 0 |
28 | 0 | 0 | 0 | 0 |
29 | 0 | 0 | 0 | 0 |
30 | 0 | 0 | 0 | 0 |
31 | 0 | 0 | 0 | 0 |
32 | 0 | 0 | 0 | 0 |
33 | 0 | 0 | 0 | 0 |
34 | 0 | 0 | 0 | 0 |
Nationally in weeks 39-40, there were 127 positive influenza tests reported. Influenza A(H3N2) was the most common subtype detected in both weeks. Many regions across Canada continue to report no influenza detections (SK, MB, NS, PE, NT, NU). More detailed weekly and cumulative influenza data are available in the text descriptions for figures 2 and 3 and the Respiratory Virus Detections in Canada Report.
Figure 3 - Text Description
Reporting provincesTable Figure 3 - Footnote 1 |
Weekly (September 25, 2016 to October 8, 2016) | Cumulative (August 28, 2016 to October 8, 2016) | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Influenza A | B | Influenza A | B | A & B Total |
|||||||
A Total |
A (H1)pdm09 |
A (H3) |
ATable Figure 3 - Footnote UnS | B Total |
A Total |
A (H1)pdm09 |
A (H3) |
ATable Figure 3 - Footnote UnS | B Total |
||
BC | 62 | 0 | 48 | 14 | <5 | >83 | <5 | 69 | 14 | 6 | 91 |
AB | >19 | 0 | 19 | <5 | <5 | >35 | <5 | 35 | <5 | 8 | 48 |
SK | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
MB | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
ON | >20 | <5 | 12 | 9 | <5 | >39 | <5 | 25 | 14 | 11 | 52 |
QC | 5 | 0 | 0 | 5 | <5 | 14 | 0 | 0 | 14 | <5 | >14 |
NB | <5 | 0 | <5 | 0 | 0 | <5 | 0 | <5 | <5 | 0 | <5 |
NS | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
PE | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
NL | 0 | 0 | 0 | 0 | 0 | <5 | 0 | <5 | 0 | 0 | <5 |
YT | <5 | 0 | <5 | 0 | 0 | <5 | 0 | <5 | 0 | 0 | <5 |
NT | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
NU | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Canada | 115 | <5 | 81 | 32 | 12 | 185 | 5 | 133 | 47 | 27 | 212 |
In weeks 39 and 40, detailed information on age and type/subtype has been received for 84 cases. Adults aged 65+ currently account for the greatest proportion of influenza cases (Table 1).
Age groups (years) | Weekly (September 25, 2016 to October 8, 2016) | Cumulative (August 28, 2016 to October 8, 2016) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Influenza A | B | Influenza A | B | Influenza A and B | ||||||||
A Total | A(H1) pdm09 | A(H3) | ATable 1 - Footnote UnS | Total | A Total | A(H1) pdm09 | A(H3) | ATable 1 - Footnote UnS | Total | # | % | |
<5 | <5 | 0 | <5 | 0 | <5 | 14 | 0 | 8 | 6 | <5 | 16 | 8% |
5-19 | <5 | 0 | <5 | 0 | <5 | >5 | 0 | 5 | <5 | <5 | 9 | 4% |
20-44 | 13 | 0 | 7 | 6 | <5 | 27 | 0 | 16 | 11 | 7 | 34 | 16% |
45-64 | >12 | 0 | 12 | <5 | <5 | >44 | <5 | 29 | 15 | 5 | 51 | 25% |
65+ | 42 | 0 | 24 | 18 | <5 | >90 | <5 | 58 | 32 | 6 | 98 | 47% |
Total | 77 | 0 | 49 | >24 | 7 | 186 | <5 | 116 | >64 | 22 | 208 | 100% |
PercentageTable 1 - Footnote 2 | 92% | 0% | 64% | 36% | 8% | 89% | 2% | 62% | 35% | 11% | - | - |
Syndromic/Influenza-like Illness Surveillance
Healthcare Professionals Sentinel Syndromic Surveillance
In weeks 39 and 40, approximately1.0% of visits to healthcare professionals were due to ILI. The ILI rate remained constant since week 35.
Figure 4 - Percentage of visits for ILI reported by sentinels by report week, Canada, 2016-17
Number of Sentinels Reporting Week 40: 80
Figure 4 - Text Description
Report week | % Visits for ILI |
---|---|
35 | 0.99% |
36 | 0.99% |
37 | 0.99% |
38 | 0.99% |
39 | 0.99% |
40 | 0.99% |
41 | 0.99% |
42 | 0.99% |
43 | 0.99% |
44 | 0.99% |
45 | 0.99% |
46 | 0.99% |
47 | 0.99% |
48 | 0.99% |
49 | 0.99% |
50 | 0.99% |
51 | 0.99% |
52 | 0.99% |
1 | 0.99% |
2 | 0.99% |
3 | 0.99% |
4 | 0.99% |
5 | 0.99% |
6 | 0.99% |
7 | 0.99% |
8 | 0.99% |
9 | 0.99% |
10 | 0.99% |
11 | 0.99% |
12 | 0.99% |
13 | 0.99% |
14 | 0.99% |
15 | 0.99% |
16 | 0.99% |
17 | 0.99% |
18 | 0.99% |
19 | 0.99% |
20 | 0.99% |
21 | 0.99% |
22 | 0.99% |
23 | 0.99% |
24 | 0.99% |
25 | 0.99% |
26 | 0.99% |
27 | 0.99% |
28 | 0.99% |
29 | 0.99% |
30 | 0.99% |
31 | 0.99% |
32 | 0.99% |
33 | 0.99% |
34 | 0.99% |
Are you a primary healthcare practitioner (General Practitioner, Nurse Practitioner or Registered Nurse) interested in becoming a FluWatch sentinel?
Please visit our Influenza Sentinel page for more details.
Influenza Outbreak Surveillance
In weeks 39-40, six laboratory confirmed influenza outbreaks were reported. A total of four outbreaks were reported in a long term care facility (LTCF), two in hospitals and one in other setting. All outbreaks were reported in week 39. Of the outbreaks with known types or subtypes, one outbreak was due to influenza A (H3N2).
Figure 5 - Text Description
Report week | Hospitals | Long Term Care Facilities | Other |
---|---|---|---|
35 | 0 | 0 | 0 |
36 | 0 | 0 | 0 |
37 | 0 | 2 | 0 |
38 | 1 | 1 | 0 |
39 | 1 | 3 | 0 |
40 | 0 | 0 | 0 |
41 | 0 | 0 | 0 |
42 | 0 | 0 | 0 |
43 | 0 | 0 | 0 |
44 | 0 | 0 | 0 |
45 | 0 | 0 | 0 |
46 | 0 | 0 | 0 |
47 | 0 | 0 | 0 |
48 | 0 | 0 | 0 |
49 | 0 | 0 | 0 |
50 | 0 | 0 | 0 |
51 | 0 | 0 | 0 |
52 | 0 | 0 | 0 |
1 | 0 | 0 | 0 |
2 | 0 | 0 | 0 |
3 | 0 | 0 | 0 |
4 | 0 | 0 | 0 |
5 | 0 | 0 | 0 |
6 | 0 | 0 | 0 |
7 | 0 | 0 | 0 |
8 | 0 | 0 | 0 |
9 | 0 | 0 | 0 |
10 | 0 | 0 | 0 |
11 | 0 | 0 | 0 |
12 | 0 | 0 | 0 |
13 | 0 | 0 | 0 |
14 | 0 | 0 | 0 |
15 | 0 | 0 | 0 |
16 | 0 | 0 | 0 |
17 | 0 | 0 | 0 |
18 | 0 | 0 | 0 |
19 | 0 | 0 | 0 |
20 | 0 | 0 | 0 |
21 | 0 | 0 | 0 |
22 | 0 | 0 | 0 |
23 | 0 | 0 | 0 |
24 | 0 | 0 | 0 |
25 | 0 | 0 | 0 |
26 | 0 | 0 | 0 |
27 | 0 | 0 | 0 |
28 | 0 | 0 | 0 |
29 | 0 | 0 | 0 |
30 | 0 | 0 | 0 |
31 | 0 | 0 | 0 |
32 | 0 | 0 | 0 |
33 | 0 | 0 | 0 |
34 | 0 | 0 | 0 |
Provincial/Territorial Influenza Hospitalizations and Deaths
Cumulatively, over 25 influenza-associated hospitalizations were reported by participating provinces and territoriesFootnote *. To date, the majority of hospitalizations have been reported in adults aged 65 years or older. No ICU admissions or deaths have been reported this season.
Age Groups (years) | Cumulative (August 28, 2016 to October 8, 2016) | |||||
---|---|---|---|---|---|---|
Hospitalizations | ICU Admissions | Deaths | ||||
Influenza A Total | Influenza B Total | Influenza A and B Total | % | Influenza A and B Total | % | |
0-4 | <5 | 0 | 0 | 0% | 0 | 0% |
5-19 | <5 | <5 | 0 | 0% | 0 | 0% |
20-44 | <5 | <5 | 0 | 0% | 0 | 0% |
45-64 | 0 | <5 | 0 | 0% | 0 | 0% |
65+ | 17 | <5 | 0 | 0% | 0 | 0% |
Total | >17 | <5 | 0 | 0% | 0 | 0% |
Sentinel Hospital Influenza Surveillance
Pediatric Influenza Hospitalizations and Deaths
To date this season, a total of five laboratory-confirmed influenza-associated pediatric (≤16 years of age) hospitalizations were reported by the Immunization Monitoring Program Active (IMPACT) network.
Influenza Strain Characterizations
During the 2016-17 influenza season, the National Microbiology Laboratory (NML) has characterized five influenza viruses [four influenza B and one influenza A(H3N2)].
Strain Characterization ResultsTable 3 - Footnote 1 | Count | Description |
---|---|---|
Influenza B | ||
B/Brisbane/60/2008-like (Victoria lineage) |
3 | Viruses antigenically similar to B/Brisbane/60/2008, the influenza B component of the 2016-17 Northern Hemisphere's trivalent and quadrivalent influenza vaccine |
B/Phuket/3073/2013-like (Yamagata lineage) |
1 | Viruses antigenically similar to B/Phuket/3073/2013, the additional influenza B component of the 2016-17 Northern Hemisphere quadrivalent influenza vaccine. |
Influenza A (H3N2) | ||
Antigenically A/Hong Kong/4801/2014-like |
1 | Viruses antigenically similar to A/Hong Kong/4801/2014, the A(H3N2) component of the 2016-17 Northern Hemisphere's trivalent and quadrivalent vaccine. |
Antiviral Resistance
During the 2016-17 season, the National Microbiology Laboratory (NML) has tested eleven influenza viruses for resistance to oseltamivir and zanamivir and one virus to Amantadine. All viruses were sensitive to oseltamivir and zanamivir (Table 4). The virus tested for resistance to Amantadine was resistant.
Virus type and subtype | Oseltamivir | Zanamivir | Amantadine | |||
---|---|---|---|---|---|---|
# tested | # resistant (%) | # tested | # resistant (%) | # tested | # resistant (%) | |
A (H3N2) | 7 | 0 (0%) | 7 | 0 (0%) | 1 | 1 (100%) |
A (H1N1) | 0 | 0(0%) | 0 | 0(0%) | 0 | 0(0%) |
B | 4 | 0 (0%) | 4 | 0 (0%) | N/ATable 4 - Footnote * | N/ATable 4 - Footnote * |
TOTAL | 11 | 0 (0%) | 11 | 0 (0%) | 1 | 1 (100%) |
Provincial and International Influenza Reports
- World Health Organization influenza update
- World Health Organization FluNet
- WHO Influenza at the human-animal interface
- Centers for Disease Control and Prevention seasonal influenza report
- European Centre for Disease Prevention and Control - epidemiological data
- South Africa Influenza surveillance report
- New Zealand Public Health Surveillance
- Australia Influenza Report
- Pan-American Health Organization Influenza Situation Report
- Alberta Health - Influenza Surveillance Report
- BC - Centre for Disease Control (BCCDC) - Influenza Surveillance
- New Brunswick - Influenza Surveillance Reports
- Newfoundland and Labrador - Surveillance and Disease Reports
- Nova Scotia - Flu Information
- Public Health Ontario - Ontario Respiratory Pathogen Bulletin
- Quebec - Système de surveillance de la grippe
- Manitoba - Epidemiology and Surveillance - Influenza Reports
- Saskatchewan - influenza Reports
- PEI - Influenza Summary
FluWatch definitions for the 2016-2017 season
Abbreviations: Newfoundland/Labrador (NL), Prince Edward Island (PE), New Brunswick (NB), Nova Scotia (NS), Quebec (QC), Ontario (ON), Manitoba (MB), Saskatchewan (SK), Alberta (AB), British Columbia (BC), Yukon (YT), Northwest Territories (NT), Nunavut (NU).
Influenza-like-illness (ILI): Acute onset of respiratory illness with fever and cough and with one or more of the following - sore throat, arthralgia, myalgia, or prostration which is likely due to influenza. In children under 5, gastrointestinal symptoms may also be present. In patients under 5 or 65 and older, fever may not be prominent.
ILI/Influenza outbreaks
- Schools:
-
Greater than 10% absenteeism (or absenteeism that is higher (e.g. >5-10%) than expected level as determined by school or public health authority) which is likely due to ILI.
Note: it is recommended that ILI school outbreaks be laboratory confirmed at the beginning of influenza season as it may be the first indication of community transmission in an area. - Hospitals and residential institutions:
- two or more cases of ILI within a seven-day period, including at least one laboratory confirmed case. Institutional outbreaks should be reported within 24 hours of identification. Residential institutions include but not limited to long-term care facilities (LTCF) and prisons.
- Workplace:
- Greater than 10% absenteeism on any day which is most likely due to ILI.
- Other settings:
- two or more cases of ILI within a seven-day period, including at least one laboratory confirmed case; i.e. closed communities.
Note that reporting of outbreaks of influenza/ILI from different types of facilities differs between jurisdictions.
Influenza/ILI activity level
1 = No activity: no laboratory-confirmed influenza detections in the reporting week, however, sporadically occurring ILI may be reported
2 = Sporadic: sporadically occurring ILI and lab confirmed influenza detection(s) with no outbreaks detected within the influenza surveillance region Footnote †
3 = Localized:
- evidence of increased ILIFootnote * and
- lab confirmed influenza detection(s) together with
- outbreaks in schools, hospitals, residential institutions and/or other types of facilities occurring in less than 50% of the influenza surveillance regionFootnote †
4 = Widespread:
- evidence of increased ILIFootnote * and
- lab confirmed influenza detection(s) together with
- outbreaks in schools, hospitals, residential institutions and/or other types of facilities occurring in greater than or equal to 50% of the influenza surveillance regionFootnote †
Note: ILI data may be reported through sentinel physicians, emergency room visits or health line telephone calls.
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