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Respiratory Virus Report, week 46 - ending November 20, 2021

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Organization: Public Health Agency of Canada

In this Respiratory Virus Report, the number of detections of coronavirus reflects only seasonal human coronaviruses, not the novel pandemic coronavirus (SARS-CoV-2) that causes COVID-19. For information on COVID-19, see the Coronavirus disease (COVID-19): Outbreak update

Overall Summary

In week 46 (November 14 to November 20, 2021):

  • Respiratory syncytial virus (995 detections; 8.0% positive), enterovirus/rhinovirus (737 detections; 20.8% positive), and human parainfluenza virus (284 detections; 7.3% positive) are the most common seasonal respiratory viruses detected in Canada.
    • Activity of respiratory syncytial virus remains above expected levels. Activity has decreased in Quebec in recent weeks, while activity has been either stable or slowly increasing in other parts of Canada.
    • Activity of enterovirus/rhinovirus is within expected levels for this time of year.
    • Activity of human parainfluenza virus remains well above expected levels.
  • Detections of other respiratory viruses are low.
  • The number of tests performed for all viruses are above expected levels.
  • 30/34 sentinel laboratories reported surveillance data.

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Abbreviations:
Flu
Influenza
A(H1)pdm09
Influenza A(H1N1)pdm09
A(H3)
Influenza A(H3N2)
A(UnS)
Influenza A(Unsubtyped)
RSV
Respiratory syncytial virus
HPIV
Human parainfluenza virus
HMPV
Human metapneumovirus
ADV
Adenovirus
EV/RV
Enterovirus/Rhinovirus
HCoV
Human coronavirus
Atl
Atlantic Canada
BC
British Columbia
Can
Canada
EORLA
Eastern Ontario Regional Laboratory Association
HSC
Health Sciences Centre
N.C.
Data not collected
N.R.
Data not reported for current week
ON
Ontario
PR
Prairies
P.H.O.L.
Public Health Ontario Laboratory
QC
Quebec
Terr
Territories of Canada
UHN
University Health Network

Respiratory virus detections

Table 1: Respiratory virus detections for the week ending November 20, 2021 (surveillance week 2021-46)
Reporting Laboratory Flu Tested A(H1)pdm09 Positive A(H3) Positive A(UnS) Positive Total Flu A Positive Total Flu B Positive RSV Tested RSV Positive HPIV Tested HPIV 1 Positive HPIV 2 Positive HPIV 3 Positive HPIV 4 Positive Other HPIV Positive ADV Tested ADV Positive HMPV Tested HMPV Positive EV/RV Tested EV/RV Positive HCoV Tested HCoV Positive
Newfoundland 288 0 0 0 0 0 287 1 287 0 0 5 0 14 288 0 287 1 287 39 N.C. N.C.
Prince Edward Island N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
Nova Scotia 545 0 0 0 0 0 545 13 84 0 0 0 0 0 84 0 84 0 84 10 84 1
New Brunswick 905 0 0 0 0 0 339 16 138 0 0 0 0 0 138 0 138 0 138 2 138 0
Atlantic 1738 0 0 0 0 0 1171 30 509 0 0 5 0 14 510 0 509 1 509 51 222 1
Région Nord-Est 450 0 0 0 0 0 240 32 4 0 0 0 0 0 4 0 4 0 N.C. N.C. 4 0
Québec-Chaudière-Appalaches 342 0 0 0 0 0 372 53 49 0 0 0 1 0 56 1 49 0 N.C. N.C. 49 1
Centre-du-Québec 336 0 0 0 0 1 319 71 29 0 0 0 0 0 29 0 29 3 N.C. N.C. 29 1
Montréal-Laval   763 0 0 0 0 0 763 49 267 0 0 1 0 0 267 25 267 25 N.C. N.C. 267 1
Ouest du Québec 231 0 0 0 0 0 231 51 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Montérégie 139 0 0 0 0 0 139 7 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 2261 0 0 0 0 1 2064 263 349 0 0 1 1 0 356 26 349 28 N.C. N.C. 349 3
P.H.O.L. - Ottawa 365 0 0 0 0 0 365 111 365 0 0 0 0 46 365 21 365 0 365 110 365 20
EORLA N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
P.H.O.L. - Kingston 74 0 0 0 0 0 74 9 74 0 0 0 0 4 74 2 74 0 74 18 74 3
UHN / Mount Sinai Hospital N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
P.H.O.L. - Toronto   243 0 3 0 3 0 243 9 243 0 0 0 0 16 243 3 243 0 243 40 243 4
Sick Kids Hospital - Toronto 62 0 0 0 0 0 0 0 62 0 0 7 0 0 62 2 62 0 62 19 62 0
Sunnybrook & Women's College HSC N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
P.H.O.L. - Sault Ste. Marie 13 0 0 0 0 0 13 0 13 0 0 0 0 1 13 0 13 0 13 3 13 0
P.H.O.L. - Timmins 8 0 0 0 0 0 8 0 8 0 0 0 0 1 8 1 8 0 8 3 8 0
St. Joseph's - London   344 0 0 0 0 0 343 24 41 0 0 0 0 4 41 1 41 0 41 14 41 1
P.H.O.L. - London 111 0 0 0 0 0 111 16 111 0 0 0 0 8 111 1 111 0 111 31 111 0
P.H.O.L. - Orillia 38 0 0 0 0 0 38 5 38 0 0 0 0 1 38 0 38 0 38 15 38 0
P.H.O.L. - Thunder Bay 2 0 0 0 0 0 2 0 2 0 0 0 0 0 2 0 2 0 2 0 2 0
P.H.O.L. - Sudbury 14 0 0 0 0 0 14 2 14 0 0 0 0 0 14 0 14 1 14 1 14 1
P.H.O.L. - Hamilton 40 0 0 0 0 0 40 2 40 0 0 0 0 0 40 0 40 0 40 16 40 0
P.H.O.L. - Peterborough 20 0 0 0 0 0 20 1 20 0 0 0 0 1 20 0 20 0 20 2 20 0
St. Joseph's - Hamilton 657 0 0 1 1 0 657 107 657 1 0 28 0 0 657 7 657 5 657 127 0 0
Province of Ontario 1991 0 3 1 4 0 1928 286 1688 1 0 35 0 82 1688 38 1688 6 1688 399 1031 29
Province of Manitoba    1933 0 0 1 1 0 1933 22 25 0 0 9 0 0 25 0 78 1 25 18 78 0
Province of Saskatchewan 948 0 0 0 0 0 948 2 126 0 0 9 1 0 126 6 126 1 126 31 126 2
Province of Alberta 1919 0 0 1 1 0 772 56 772 0 1 46 9 0 772 13 772 1 772 149 772 42
Prairies 4800 0 0 2 2 0 3653 80 923 0 1 64 10 0 923 19 976 3 923 198 976 44
British Columbia 3286 0 2 0 9 6 3259 336 417 0 0 65 5 0 417 14 417 0 404 84 404 6
Yukon 171 0 1 0 1 0 171 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C.
Northwest Territories 17 0 0 0 0 0 17 0 1 0 0 0 0 0 1 0 1 0 17 5 1 0
Nunavut 233 0 0 0 0 0 232 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Territories 421 0 1 0 1 0 420 0 1 0 0 0 0 0 1 0 1 0 17 5 1 0
CANADA 14497 0 6 3 16 7 12495 995 3887 1 1 170 16 96 3895 97 3940 38 3541 737 2983 83

The data in the RVDSS report represent surveillance data available at the time of writing. Data missing from the current week are denoted by N.R. Data not collected by reporting lab denoted by N.C.

Note: 10 reported influenza detections this week were known to be associated with recent live attenuated influenza vaccine (LAIV) receipt and were excluded from the data as they do not represent community transmission of seasonal influenza viruses.

The reporting laboratory previously listed as CHEO - Ottawa is now listed as EORLA to better reflect data submitted by this provider.

Specimens from Yukon (YT), Northwest Territories (NT) and Nunavut (NU) are sent to reference laboratories in other provinces and reported results reflect specimens identified as originating from YT, NT or NU.

Results from British Columbia (BC) comprise of specimens from the following sites: BC Children's and Women's Hospital, Children's and Women's Hospital Laboratory, Fraser Health Medical Microbiology Laboratory, Island Health, Providence Health Care, Powell River Hospital , St. Paul's Hospital , Vancouver General Hospital, Victoria General Hospital, BCCDC Public Health Laboratory, Interior Health Authority sites and Northern Health Authority sites.

Delays in the reporting of data may cause data to change retrospectively.

For BC and YT, only data from subtyped influenza A specimens are included in the weekly number of influenza detections. The sum of A(H1N1)pdm09, A(H3), and A(UnS) positive results may not equal the sum of total Flu A positive results.

Table 2: Cumulative respiratory virus detections from August 29, 2021 to November 20, 2021 (surveillance weeks 2021-35 to 2021-46)
Reporting Laboratory Flu Tested A(H1)pdm09 Positive A(H3) Positive A(UnS) Positive Total Flu A Positive Total Flu B Positive RSV Tested RSV Positive HPIV Tested HPIV 1 Positive HPIV 2 Positive HPIV 3 Positive HPIV 4 Positive Other HPIV Positive ADV Tested ADV Positive HMPV Tested HMPV Positive EV/RV Tested EV/RV Positive HCoV Tested HCoV Positive
Newfoundland 5596 0 0 0 0 0 5595 9 5598 1 3 107 0 105 5599 14 5595 3 5599 1578 N.C. N.C.
Prince Edward Island 875 0 0 0 0 0 875 2 875 0 0 140 0 0 875 14 875 0 875 262 875 19
Nova Scotia 1288 0 0 0 0 0 1288 27 640 0 2 31 0 0 654 5 654 0 654 67 654 2
New Brunswick 3386 0 0 0 0 0 2228 21 1597 0 0 19 0 0 1590 2 1597 0 1597 20 1506 0
Atlantic 11145 0 0 0 0 0 9986 59 8710 1 5 297 0 105 8718 35 8721 3 8725 1927 3035 21
Région Nord-Est 6170 0 0 0 0 0 3349 1132 482 0 0 6 0 0 482 11 15 0 N.C. N.C. 298 2
Québec-Chaudière-Appalaches 2130 0 0 0 0 2 2702 848 384 0 0 5 1 0 392 12 304 0 N.C. N.C. 306 3
Centre-du-Québec 1762 0 0 0 0 1 2082 923 241 0 0 9 0 0 241 4 249 4 N.C. N.C. 234 3
Montréal-Laval   7821 0 0 3 3 3 7825 2203 2240 2 1 14 0 0 2240 139 2240 82 N.C. N.C. 2240 8
Ouest du Québec 1986 0 0 0 0 0 1954 779 9 0 0 0 0 0 5 0 8 0 N.C. N.C. 8 0
Montérégie 1196 0 0 0 0 0 1196 336 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 21065 0 0 3 3 6 19108 6221 3356 2 1 34 1 0 3360 166 2816 86 N.C. N.C. 3086 16
P.H.O.L. - Ottawa 4634 1 1 0 2 0 4634 1085 4634 0 0 0 0 601 4634 173 4633 17 4634 1757 4633 106
EORLA 1677 0 0 0 0 0 1652 207 289 0 0 13 0 0 289 1 1 0 289 63 25 1
P.H.O.L. - Kingston 571 0 0 0 0 0 571 29 570 0 0 0 0 120 570 9 569 2 570 216 569 12
UHN / Mount Sinai Hospital 4585 0 0 1 1 0 4585 13 152 0 0 0 0 0 152 0 152 0 152 8 152 0
P.H.O.L. - Toronto   3016 0 4 0 4 0 3014 79 3014 0 0 0 0 196 3015 21 3014 2 3014 575 3015 30
Sick Kids Hospital - Toronto 567 0 0 0 0 0 0 0 567 0 0 61 0 0 567 7 567 1 567 170 567 1
Sunnybrook & Women's College HSC N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R. N.R.
P.H.O.L. - Sault Ste. Marie 70 0 0 0 0 0 70 0 70 0 0 0 0 5 70 0 70 0 70 23 70 0
P.H.O.L. - Timmins 76 0 0 0 0 0 76 2 76 0 0 0 0 6 76 1 76 0 76 14 76 0
St. Joseph's - London   1332 0 0 0 0 0 1331 60 433 0 0 7 0 55 433 10 433 1 415 106 414 1
P.H.O.L. - London 847 0 0 0 0 0 847 37 847 0 0 0 0 110 847 14 847 1 847 250 847 5
P.H.O.L. - Orillia 251 0 1 0 1 0 251 18 251 0 0 0 0 32 251 5 249 2 251 102 249 2
P.H.O.L. - Thunder Bay 74 0 0 0 0 0 74 0 74 0 0 0 0 0 74 0 74 0 74 31 74 1
P.H.O.L. - Sudbury 146 0 0 0 0 0 146 2 146 0 0 0 0 2 146 0 146 2 146 25 146 1
P.H.O.L. - Hamilton 431 0 2 0 2 0 427 17 427 0 0 0 0 32 427 4 427 4 427 121 427 1
P.H.O.L. - Peterborough 237 0 0 0 0 0 237 8 236 0 0 0 0 8 236 1 235 0 236 43 235 2
St. Joseph's - Hamilton 4878 0 1 1 2 0 4872 360 4872 2 0 562 0 0 4872 28 4872 9 4872 993 0 0
Province of Ontario 23392 1 9 2 12 0 22787 1917 16658 2 0 643 0 1167 16659 274 16365 41 16640 4497 11499 163
Manitoba    20521 1 3 3 7 0 20521 128 303 1 1 32 0 0 303 6 1004 3 303 139 810 2
Province of Saskatchewan 6199 0 0 1 1 0 6170 21 1010 0 0 40 5 0 1010 18 1010 1 1010 227 1009 5
Province of Alberta 21869 0 2 4 6 0 8472 211 8472 0 4 433 51 0 8472 75 8472 9 8472 1671 8472 224
Prairies 48589 1 5 8 14 0 35163 360 9785 1 5 505 56 0 9785 99 10486 13 9785 2037 10291 231
British Columbia 27795 0 8 3 34 31 27725 1295 6160 0 0 700 46 60 6160 66 6156 28 5988 1438 6038 23
Yukon 2888 0 1 0 4 6 2953 4 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C.
Northwest Territories 200 0 0 0 0 0 186 0 33 0 0 0 0 0 33 2 33 0 185 30 33 0
Nunavut 3455 0 0 0 0 0 3451 4 8 0 0 0 0 0 8 1 8 0 8 5 8 0
Territories 6543 0 1 0 4 6 6590 8 41 0 0 0 0 0 41 3 41 0 193 35 41 0
CANADA 138529 2 23 16 67 43 121359 9860 44710 6 11 2179 103 1332 44723 643 44585 171 41331 9934 33990 454

The data in the RVDSS report represent surveillance data available at the time of writing. Data not collected by reporting lab denoted by N.C.

Note: 32 influenza detections reported to date this season are known to be associated with recent live attenuated influenza vaccine (LAIV) receipt and were excluded from the data as they do not represent community transmission of seasonal influenza viruses.

Specimens from Yukon (YT), Northwest Territories (NT) and Nunavut (NU) are sent to reference laboratories in other provinces and reported results reflect specimens identified as originating from YT, NT or NU.

The reporting laboratory previously listed as CHEO - Ottawa is now listed as EORLA to better reflect data submitted by this provider.

Results from British Columbia (BC) comprise of specimens from the following sites: BC Children's and Women's Hospital, Children's and Women's Hospital Laboratory, Fraser Health Medical Microbiology Laboratory, Island Health, Providence Health Care, Powell River Hospital , St. Paul's Hospital , Vancouver General Hospital, Victoria General Hospital, BCCDC Public Health Laboratory, Interior Health Authority sites and Northern Health Authority sites.

Delays in the reporting of data may cause data to change retrospectively. Due to these delays, the sum of weekly report totals do not add up to cumulative totals.

For BC and YT, only data from subtyped influenza A specimens are included in the weekly number of influenza detections. The sum of A(H1N1)pdm09, A(H3), and A(UnS) positive results may not equal the sum of total Flu A positive results.

Positive respiratory virus tests historical comparison

Figure 1: Positive respiratory virus tests (%) reported by participating laboratories in Canada by surveillance week compared to average and range from 2014-2015 to 2019-2020 season

Figure 1

Shaded area represents the maximum and minimum % of respiratory virus tests positive reported by week from seasons 2014-2015 to 2019-2020

Note: Data from week 11 of the 2019-2020 season onwards are excluded from the historical comparison due to the COVID-19 pandemic

Note: % Tests Positive scale changes across the dashed line

a Human coronavirus excludes human coronaviruses SARS-CoV, MERS-CoV and SARS-CoV-2; Includes seasonal human coronaviruses HCoV-229E, HCoV-OC43, HCoV-NL63, HCoV-HKU1.

Figure 1: Positive respiratory virus tests (%) reported by participating laboratories in Canada by surveillance week compared to average and range from 2014-2015 to 2019-2020 season
Week Week end 2021-2022 A% 2020-2021 A% Max A% Base Min A% Base Av A% Base 2021-2022 B% 2020-2021 B% Max B% Base Min B% Base Av B% Base 2021-2022 RSV% 2020-2021 RSV% Max RSV% Base Min RSV% Base Av RSV% Base 2021-2022 HPIV% 2020-2021 HPIV% Max HPIV% Base Min HPIV% Base Av HPIV% Base 2021-2022 ADV% 2020-2021 ADV% Max ADV% Base Min ADV% Base Av ADV% Base 2021-2022 HMPV% 2020-2021 HMPV% Max HMPV% Base Min HMPV% Base Av HMPV% Base 2021-2022 EV/RV% 2020-2021 EV/RV% Max EV/RV% Base Min EV/RV% Base Av EV/RV% Base 2021-2022 HCoV% 2020-2021 HCoV% Max HCoV% Base Min HCoV% Base Av HCoV% Base
35 2021-09-04 0.04 0.00 1.60 0.11 0.68 0.00 0.02 0.28 0.00 0.13 4.99 0.02 1.34 0.38 0.60 5.99 0.08 3.16 1.15 2.42 1.18 0.27 1.74 0.99 1.43 0.23 0.17 2.04 0.10 0.77 21.97 9.07 27.19 22.44 24.78 1.05 0.06 0.76 0.18 0.45
36 2021-09-11 0.01 0.00 2.11 0.23 0.98 0.00 0.00 0.55 0.00 0.15 7.55 0.04 1.09 0.22 0.57 4.92 0.20 3.31 1.35 2.32 1.15 0.40 2.85 1.42 1.87 0.24 0.06 0.84 0.10 0.48 18.62 8.13 30.69 23.30 26.31 0.62 0.00 0.38 0.12 0.22
37 2021-09-18 0.04 0.00 1.59 0.36 0.87 0.00 0.00 0.19 0.04 0.12 8.56 0.02 1.37 0.31 0.64 5.97 0.13 3.26 1.65 2.40 0.81 0.35 2.44 1.38 1.86 0.17 0.05 1.61 0.00 0.51 27.51 8.07 33.58 27.74 31.68 0.44 0.05 0.56 0.00 0.26
38 2021-09-25 0.00 0.02 2.15 0.43 1.16 0.00 0.00 0.21 0.00 0.14 8.07 0.10 1.24 0.37 0.64 4.73 0.07 2.87 1.92 2.33 0.82 0.58 2.04 1.11 1.63 0.37 0.02 1.43 0.06 0.47 33.16 15.67 39.57 32.80 35.33 0.67 0.00 1.36 0.06 0.43
39 2021-10-02 0.01 0.00 2.65 0.57 1.53 0.00 0.00 0.29 0.09 0.18 9.36 0.05 1.29 0.41 0.68 8.12 0.02 3.01 1.70 2.24 1.14 0.19 2.27 1.04 1.66 0.17 0.04 0.72 0.05 0.28 30.02 24.12 40.59 34.87 37.68 0.62 0.05 0.66 0.07 0.45
40 2021-10-09 0.00 0.00 2.17 1.01 1.58 0.02 0.00 0.20 0.05 0.11 9.25 0.07 1.39 0.34 0.67 8.19 0.02 3.28 1.90 2.43 1.31 0.44 2.25 1.39 1.82 0.16 0.00 0.92 0.05 0.34 26.24 16.62 41.29 33.00 35.43 0.57 0.09 1.08 0.22 0.58
41 2021-10-16 0.03 0.01 2.66 1.05 1.57 0.03 0.00 0.36 0.03 0.16 10.39 0.10 1.74 0.58 0.98 10.29 0.06 3.70 1.94 2.74 1.39 0.37 1.91 1.28 1.70 0.20 0.19 0.95 0.04 0.46 22.63 15.48 33.62 26.94 29.81 1.72 0.02 0.70 0.00 0.33
42 2021-10-23 0.03 0.00 2.96 0.77 1.92 0.02 0.00 0.45 0.05 0.25 8.85 0.07 2.11 0.63 1.14 10.01 0.06 3.89 2.64 3.20 2.54 0.47 2.38 1.47 1.86 0.15 0.06 0.89 0.15 0.38 22.17 13.60 32.62 24.54 27.82 1.07 0.00 1.18 0.20 0.49
43 2021-10-30 0.03 0.01 5.23 0.68 2.60 0.02 0.00 0.55 0.06 0.23 8.85 0.07 2.16 0.55 1.32 9.58 0.07 3.98 3.18 3.56 1.21 0.37 2.42 1.63 1.96 0.39 0.02 1.64 0.12 0.57 20.02 13.14 28.73 21.67 24.95 1.05 0.00 2.35 0.27 0.75
44 2021-11-06 0.10 0.04 8.42 1.08 3.39 0.10 0.03 0.71 0.12 0.31 8.18 0.05 3.35 0.83 1.92 10.27 0.03 4.81 2.94 3.70 1.42 0.22 2.88 1.18 2.20 0.77 0.13 1.08 0.23 0.47 21.44 9.23 23.82 16.75 21.34 2.21 0.00 2.59 0.21 0.88
45 2021-11-13 0.08 0.02 9.83 1.18 4.19 0.06 0.02 0.97 0.22 0.44 7.32 0.04 4.43 1.29 2.59 9.98 0.01 5.42 2.53 4.01 1.61 0.33 2.68 2.02 2.42 0.64 0.01 1.30 0.04 0.77 22.37 9.70 23.08 15.17 20.56 2.54 0.03 2.74 0.52 0.96
46 2021-11-20 0.11 0.03 13.95 1.42 5.47 0.05 0.01 1.49 0.09 0.58 7.96 0.06 6.33 1.38 3.29 7.31 0.04 5.72 1.62 4.19 2.49 0.30 2.90 1.99 2.53 0.96 0.04 1.43 0.18 0.79 20.81 9.02 22.77 15.28 19.27 2.78 0.03 3.32 0.46 1.25

Number of positive respiratory virus tests

Figure 2: Number of positive respiratory virus tests reported by participating laboratories in Canada by surveillance week
Figure 2
Figure 2: Number of positive respiratory virus tests reported by participating laboratories in Canada by surveillance week
Week ParaInfluenza Adenovirus Human metapneumovirus Enterovirus/Rhinovirus Coronavirus Respiratory syncytial virus Influenza
35 158 31 6 557 21 286 3
36 142 33 7 511 14 479 1
37 207 28 6 911 11 628 4
38 179 31 14 1,180 17 649 0
39 329 46 7 1,147 17 771 1
40 313 50 6 920 17 867 2
41 362 49 7 721 48 932 6
42 402 102 6 788 36 942 6
43 377 48 15 696 35 1,031 7
44 405 56 30 777 67 1,134 32
45 447 72 29 930 88 1,144 24
46 284 97 38 737 83 995 23

Positive influenza (Flu) tests

Figure 3: Positive influenza (Flu) tests (%) in Canada by region by surveillance week
Figure 3
Figure 3: Positive influenza (Flu) tests (%) in Canada by region by surveillance week
Week Week end Can Tests Can A% Can B% Atl Tests Atl A% Atl B% QC Tests QC A% QC B% ON Tests ON A% ON B% Pr Tests Pr A% Pr B% BC Tests BC A% BC B% Terr Tests Terr A% Terr B%
35 2021-09-04 6896 0.04 0.00 625 0.00 0.00 848 0.12 0.00 1305 0.00 0.00 2848 0.04 0.00 1025 0.10 0.00 245 0.00 0.00
36 2021-09-11 7686 0.01 0.00 675 0.00 0.00 1369 0.00 0.00 1224 0.08 0.00 3301 0.00 0.00 930 0.00 0.00 187 0.00 0.00
37 2021-09-18 8899 0.04 0.00 1009 0.00 0.00 1718 0.00 0.00 1543 0.13 0.00 3454 0.06 0.00 985 0.00 0.00 190 0.00 0.00
38 2021-09-25 9353 0.00 0.00 1141 0.00 0.00 1502 0.00 0.00 1647 0.00 0.00 3640 0.00 0.00 1192 0.00 0.00 231 0.00 0.00
39 2021-10-02 9370 0.01 0.00 1052 0.00 0.00 1089 0.00 0.00 1954 0.00 0.00 3481 0.03 0.00 1611 0.00 0.00 183 0.00 0.00
40 2021-10-09 10493 0.00 0.02 799 0.00 0.00 1641 0.00 0.12 2059 0.00 0.00 3890 0.00 0.00 1823 0.00 0.00 281 0.00 0.00
41 2021-10-16 10022 0.03 0.03 614 0.00 0.00 1704 0.00 0.18 1893 0.05 0.00 3630 0.03 0.00 1904 0.05 0.00 277 0.00 0.00
42 2021-10-23 12275 0.03 0.02 634 0.00 0.00 2050 0.00 0.00 2269 0.04 0.00 4568 0.00 0.00 2440 0.08 0.04 314 0.32 0.32
43 2021-10-30 12910 0.03 0.02 851 0.00 0.00 2119 0.05 0.00 2143 0.00 0.00 4647 0.04 0.00 2920 0.00 0.07 230 0.43 0.43
44 2021-11-06 15471 0.10 0.10 577 0.00 0.00 2323 0.00 0.00 2473 0.04 0.00 5041 0.00 0.00 4625 0.30 0.28 432 0.23 0.69
45 2021-11-13 17564 0.08 0.06 1195 0.00 0.00 2441 0.04 0.00 2833 0.07 0.00 5298 0.08 0.00 5054 0.14 0.18 743 0.00 0.13
46 2021-11-20 14497 0.11 0.05 1738 0.00 0.00 2261 0.00 0.04 1991 0.20 0.00 4800 0.04 0.00 3286 0.27 0.18 421 0.24 0.00

Positive respiratory syncytial virus (RSV) tests

Figure 4: Positive respiratory syncytial virus (RSV) tests (%) in Canada by region by surveillance week
Figure 4
Figure 4: Positive respiratory syncytial virus (RSV) tests (%) in Canada by region by surveillance week
Week Week end Can Tests RSV% Atl Tests RSV% QC Tests RSV% ON Tests RSV% Pr Tests RSV% BC Tests RSV% Terr Tests RSV%
35 2021-09-04 5726 4.99 613 0.00 693 37.95 1277 1.49 1874 0.05 1025 0.29 244 0.00
36 2021-09-11 6346 7.55 671 0.60 1069 39.85 1187 3.12 2233 0.22 930 0.54 256 0.78
37 2021-09-18 7340 8.56 997 0.40 1310 40.76 1498 5.07 2362 0.30 985 0.71 188 0.00
38 2021-09-25 8038 8.07 1135 0.00 1356 41.67 1612 3.97 2513 0.32 1192 1.01 230 0.00
39 2021-10-02 8239 9.36 1052 0.10 1104 53.53 1913 7.42 2377 0.55 1611 1.49 182 0.00
40 2021-10-09 9376 9.25 792 0.38 1583 39.36 2015 9.43 2884 0.76 1823 1.59 279 0.00
41 2021-10-16 8966 10.39 608 0.16 1676 42.78 1867 8.36 2635 0.72 1904 2.00 276 0.36
42 2021-10-23 10649 8.85 581 0.17 1845 33.88 2199 9.55 3272 1.04 2440 2.95 312 0.00
43 2021-10-30 11646 8.85 730 0.14 2121 31.02 2105 9.88 3541 1.04 2920 4.35 229 0.00
44 2021-11-06 13870 8.18 564 1.24 2048 26.46 2421 10.45 3797 1.69 4612 5.77 428 0.47
45 2021-11-13 15633 7.32 837 0.84 2239 18.49 2764 9.99 4032 1.74 5024 7.48 737 0.14
46 2021-11-20 12495 7.96 1171 2.56 2064 12.74 1928 14.83 3653 2.19 3259 10.31 420 0.00

Positive human parainfluenza virus (HPIV) tests

Figure 5: Positive human parainfluenza virus (HPIV) tests (%) in Canada by region by surveillance week
Figure 5
Figure 5: Positive human parainfluenza virus (HPIV) tests (%) in Canada by region by surveillance week
Week Week End Can Tests HPIV% Atl Tests HPIV% QC Tests HPIV% ON Tests HPIV% Pr Tests HPIV% BC Tests HPIV%
35 2021-09-04 2637 5.99 580 1.38 138 5.07 857 14.47 739 1.89 315 1.59
36 2021-09-11 2884 4.92 653 2.91 149 4.03 805 11.55 955 1.57 317 2.84
37 2021-09-18 3465 5.97 978 3.89 139 0.72 1099 10.74 857 3.03 386 6.22
38 2021-09-25 3783 4.73 1083 3.69 222 0.45 1113 8.18 857 2.33 506 5.34
39 2021-10-02 4050 8.12 1070 4.86 232 1.72 1461 13.07 765 5.88 517 7.16
40 2021-10-09 3822 8.19 721 6.38 314 1.27 1542 12.39 717 5.58 524 6.11
41 2021-10-16 3517 10.29 543 6.45 335 0.90 1404 13.46 725 7.31 510 16.08
42 2021-10-23 4017 10.01 628 5.41 454 0.44 1631 11.77 769 8.19 531 20.90
43 2021-10-30 3935 9.58 587 1.70 414 0.97 1541 11.29 778 8.10 608 20.72
44 2021-11-06 3942 10.27 415 10.84 293 0.34 1690 10.00 835 8.26 708 17.09
45 2021-11-13 4480 9.98 708 6.78 317 0.95 1769 8.48 864 9.72 819 19.78
46 2021-11-20 3887 7.31 509 3.73 349 0.57 1688 6.99 923 8.13 417 16.79

Positive adenovirus (ADV) tests

Figure 6: Positive adenovirus (ADV) tests (%) in Canada by region by surveillance week
Figure 6
Figure 6: Positive adenovirus (ADV) tests (%) in Canada by region by surveillance week
Week Week End Can Tests ADV% Atl Tests ADV% QC Tests ADV% ON Tests ADV% Pr Tests ADV% BC Tests ADV%
35 2021-09-04 2629 1.18 573 1.05 137 4.38 857 1.52 739 0.54 315 0.32
36 2021-09-11 2882 1.15 653 0.61 147 4.76 805 1.61 955 0.63 317 0.95
37 2021-09-18 3468 0.81 980 0.51 138 0.00 1101 1.45 857 0.23 386 1.04
38 2021-09-25 3780 0.82 1083 0.46 219 2.28 1113 0.54 857 0.47 506 2.17
39 2021-10-02 4051 1.14 1071 0.28 232 3.45 1461 1.37 765 1.18 517 1.16
40 2021-10-09 3822 1.31 721 0.14 314 1.91 1542 1.95 717 1.67 524 0.19
41 2021-10-16 3517 1.39 543 0.18 335 5.07 1404 1.64 725 0.97 510 0.20
42 2021-10-23 4018 2.54 628 0.00 455 11.87 1631 2.33 769 0.91 531 0.56
43 2021-10-30 3952 1.21 601 0.17 417 3.12 1541 1.56 778 1.03 608 0.33
44 2021-11-06 3942 1.42 415 0.96 293 1.02 1690 1.60 835 1.44 708 1.41
45 2021-11-13 4477 1.61 705 0.71 317 6.62 1769 1.47 864 1.04 819 1.22
46 2021-11-20 3895 2.49 510 0.00 356 7.30 1688 2.25 923 2.06 417 3.36

Positive human metapneumovirus (HMPV) tests

Figure 7: Positive human metapneumovirus (HMPV) tests (%) in Canada by region by surveillance week
Figure 7
Figure 7: Positive human metapneumovirus (HMPV) tests (%) in Canada by region by surveillance week
Week Week End Can Tests HMPV% Atl Tests HMPV% QC Tests HMPV% ON Tests HMPV% Pr Tests HMPV% BC Tests HMPV%
35 2021-09-04 2665 0.23 580 0.00 138 2.17 832 0.36 792 0.00 315 0.00
36 2021-09-11 2935 0.24 653 0.00 149 0.67 796 0.50 1015 0.20 317 0.00
37 2021-09-18 3486 0.17 978 0.00 138 1.45 1072 0.19 906 0.11 386 0.26
38 2021-09-25 3810 0.37 1083 0.00 219 1.83 1086 0.74 914 0.00 506 0.40
39 2021-10-02 4057 0.17 1070 0.00 232 0.86 1428 0.21 809 0.00 513 0.39
40 2021-10-09 3769 0.16 721 0.00 238 1.26 1503 0.20 779 0.00 524 0.00
41 2021-10-16 3438 0.20 543 0.18 229 0.87 1379 0.07 777 0.00 510 0.59
42 2021-10-23 3877 0.15 628 0.00 276 0.36 1611 0.12 827 0.00 531 0.56
43 2021-10-30 3880 0.39 601 0.00 313 3.51 1510 0.13 841 0.24 608 0.00
44 2021-11-06 3903 0.77 415 0.00 210 6.19 1663 0.24 906 0.33 708 1.41
45 2021-11-13 4534 0.64 705 0.14 325 4.92 1739 0.17 943 0.21 819 0.85
46 2021-11-20 3940 0.96 509 0.20 349 8.02 1688 0.36 976 0.31 417 0.00

Positive enterovirus/rhinovirus (EV/RV) tests

Figure 8: Positive enterovirus/rhinovirus (EV/RV) tests (%) in Canada by region by surveillance week
Figure 8
Figure 8: Positive enterovirus/rhinovirus (EV/RV) tests (%) in Canada by region by surveillance week
Week Week End Can Tests EV/RV% Atl Tests EV/RV% QC Tests EV/RV% ON Tests EV/RV% Pr Tests EV/RV% BC Tests EV/RV%
35 2021-09-04 2535 21.97 580 21.21 N.A. N.A. 857 26.49 739 21.52 311 14.15
36 2021-09-11 2745 18.62 653 15.62 N.A. N.A. 805 21.24 955 18.74 311 18.01
37 2021-09-18 3312 27.51 978 33.44 N.A. N.A. 1081 27.84 857 22.29 378 23.02
38 2021-09-25 3558 33.16 1083 43.40 N.A. N.A. 1113 31.63 857 25.20 497 27.97
39 2021-10-02 3821 30.02 1070 32.52 N.A. N.A. 1461 32.44 765 21.31 513 30.99
40 2021-10-09 3506 26.24 721 17.48 N.A. N.A. 1542 33.01 717 23.85 515 21.75
41 2021-10-16 3186 22.63 543 16.21 N.A. N.A. 1404 26.78 725 15.17 502 28.88
42 2021-10-23 3555 22.17 628 11.78 N.A. N.A. 1631 25.32 769 21.98 515 25.05
43 2021-10-30 3477 20.02 601 4.33 N.A. N.A. 1540 24.68 778 19.15 539 25.97
44 2021-11-06 3624 21.44 415 16.39 N.A. N.A. 1675 23.28 835 17.96 689 24.38
45 2021-11-13 4158 22.37 709 12.83 N.A. N.A. 1763 27.11 864 21.06 812 21.55
46 2021-11-20 3541 20.81 509 10.02 N.A. N.A. 1688 23.64 923 21.45 404 20.79

Positive human coronavirus (HCoV) tests

Figure 9: Positive human coronavirus (HCoV) tests (%) in Canada by region by surveillance week
Figure 9
Figure 9: Positive human coronavirus (HCoV) tests (%) in Canada by region by surveillance week
Week Week End Can Tests HCoV% Atl Tests HCoV% QC Tests HCoV% ON Tests HCoV% Pr Tests HCoV% BC Tests HCoV%
35 2021-09-04 1992 1.05 98 0.00 138 0.00 645 1.71 792 1.01 311 0.64
36 2021-09-11 2262 0.62 202 0.00 149 0.00 584 1.03 1015 0.69 307 0.33
37 2021-09-18 2476 0.44 247 0.40 131 0.00 809 0.49 905 0.55 378 0.26
38 2021-09-25 2552 0.67 130 0.00 221 0.00 788 1.14 914 0.88 497 0.00
39 2021-10-02 2721 0.62 120 0.00 232 0.43 1042 0.38 809 1.48 513 0.00
40 2021-10-09 2986 0.57 332 0.30 238 0.00 1118 0.81 779 0.77 515 0.19
41 2021-10-16 2787 1.72 250 1.60 335 0.90 975 1.64 725 2.90 502 0.80
42 2021-10-23 3351 1.07 353 0.28 453 0.22 1200 1.33 827 1.81 515 0.58
43 2021-10-30 3332 1.05 601 0.67 313 0.64 1042 1.34 778 1.80 593 0.17
44 2021-11-06 3029 2.21 154 3.90 210 2.38 1069 1.87 906 3.64 689 0.44
45 2021-11-13 3461 2.54 326 0.92 317 0.32 1139 2.19 864 6.71 812 0.12
46 2021-11-20 2983 2.78 222 0.45 349 0.86 1031 2.81 976 4.51 404 1.49

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