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Respiratory Virus Report, week 50 - ending December 18, 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 50 (December 12 to December 18, 2021), activity of almost all respiratory viruses is within expected levels for this time of year.

  • Respiratory syncytial virus (2,139 detections; 10.8% positive), enterovirus/rhinovirus (617 detections; 11.9% positive) are the most common seasonal respiratory viruses detected in Canada.
    • Activity of respiratory syncytial virus is within expected levels. Activity has been either stable or slowly increasing in most regions of Canada.
    • Activity of enterovirus/rhinovirus is within expected levels for this time of year.
  • Detections of other respiratory viruses are low, but activity of seasonal human coronavirus has been increasing in recent weeks and is above expected levels.
  • The number of tests performed for most viruses are above expected levels.
  • 32/34 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 December 18, 2021 (surveillance week 2021-50)
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 321 0 0 0 0 0 321 21 321 0 0 2 0 11 321 0 321 2 321 25 N.C. N.C.
Prince Edward Island 150 0 0 0 0 0 150 19 150 0 0 3 0 0 150 3 150 0 150 22 150 14
Nova Scotia 892 0 0 1 1 0 586 24 28 0 0 0 1 0 28 2 28 0 28 4 28 6
New Brunswick 803 0 0 4 4 0 385 54 178 0 0 0 0 0 178 0 178 0 178 1 178 2
Atlantic 2166 0 0 5 5 0 1442 118 677 0 0 5 1 11 677 5 677 2 677 52 356 22
Région Nord-Est 695 0 0 0 0 0 346 26 1 0 0 0 0 0 107 1 1 0 N.C. N.C. 107 2
Québec-Chaudière-Appalaches 307 0 0 0 0 0 296 18 45 0 0 0 2 0 86 7 86 10 N.C. N.C. 79 4
Centre-du-Québec 579 0 0 1 1 0 545 25 19 0 0 0 0 0 19 3 19 1 N.C. N.C. 19 2
Montréal-Laval   769 0 0 1 1 0 762 29 291 1 0 1 2 0 291 22 291 33 N.C. N.C. 291 7
Ouest du Québec 222 0 0 1 1 0 222 25 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Montérégie 187 0 0 1 1 0 183 9 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 2759 0 0 4 4 0 2354 132 356 1 0 1 4 0 503 33 397 44 N.C. N.C. 496 15
P.H.O.L. - Ottawa 323 1 0 0 1 0 323 72 323 0 0 0 0 16 323 40 323 5 323 94 323 46
EORLA 300 0 0 0 0 0 300 49 26 0 0 0 0 0 26 1 26 0 26 3 26 0
P.H.O.L. - Kingston 37 0 0 0 0 0 37 9 37 0 0 0 0 0 37 0 37 0 37 1 37 5
UHN / Mount Sinai Hospital 557 0 0 0 0 0 557 13 9 0 0 0 0 0 9 0 9 0 9 0 9 1
P.H.O.L. - Toronto   302 0 3 0 3 0 296 24 296 0 0 0 0 6 296 7 296 0 296 25 296 19
Sick Kids Hospital - Toronto 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.
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 15 0 0 0 0 0 15 2 15 0 0 0 0 1 15 0 15 0 15 2 15 1
P.H.O.L. - Timmins 24 0 0 0 0 0 24 1 24 0 0 0 0 0 24 0 24 0 24 7 24 2
St. Joseph's - London   820 0 0 7 7 0 820 123 820 0 0 0 0 4 820 12 820 2 820 59 7 0
P.H.O.L. - London 189 0 3 0 3 0 186 62 186 0 0 0 0 6 186 6 186 4 186 17 186 19
P.H.O.L. - Orillia 53 0 0 0 0 0 53 17 53 0 0 0 0 0 53 4 53 1 53 8 53 5
P.H.O.L. - Thunder Bay 13 0 0 0 0 0 13 4 13 0 0 0 0 1 13 0 13 0 13 5 13 0
P.H.O.L. - Sudbury 6 0 0 0 0 0 6 1 6 0 0 0 0 0 6 0 6 0 6 2 6 0
P.H.O.L. - Hamilton 76 0 0 0 0 0 76 11 76 0 0 0 0 4 76 0 76 0 76 16 76 5
P.H.O.L. - Peterborough 44 0 0 0 0 0 44 6 44 0 0 0 0 1 44 0 43 0 44 3 43 5
St. Joseph's - Hamilton 1063 0 0 0 0 0 1063 198 1063 0 0 9 0 0 1063 17 1063 2 1063 86 0 0
Province of Ontario 3822 1 6 7 14 0 3813 592 2991 0 0 9 0 39 2991 87 2990 14 2991 328 1114 108
Province of Manitoba 1927 0 0 0 0 0 1927 75 59 0 0 5 0 0 59 1 87 0 59 3 87 1
Province of Saskatchewan 713 0 0 1 1 0 712 5 139 0 0 18 2 0 139 2 139 0 139 28 139 11
Province of Alberta 2037 0 1 4 5 1 749 170 749 0 0 23 7 0 749 13 749 3 749 93 749 86
Prairies 4677 0 1 5 6 1 3388 250 947 0 0 46 9 0 947 16 975 3 947 124 975 98
British Columbia 8631 0 4 0 30 3 8604 1009 534 0 0 30 3 9 534 15 534 0 527 103 527 12
Yukon 59 0 0 0 0 0 59 37 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 33 0 0 0 0 0 33 0 0 0 0 0 0 0 0 0 0 0 33 10 0 0
Nunavut 156 0 0 0 0 0 155 1 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.
Territories 248 0 0 0 0 0 247 38 0 0 0 0 0 0 0 0 0 0 33 10 0 0
CANADA 22303 1 11 21 59 4 19848 2139 5505 1 0 91 17 59 5652 156 5573 63 5175 617 3468 255

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.

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

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 December 18, 2021 (surveillance weeks 2021-35 to 2021-50)
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 6802 0 0 0 0 0 6801 48 6804 1 3 116 0 152 6806 16 6801 14 6805 1699 N.C. N.C.
Prince Edward Island 1419 0 0 0 0 0 1419 59 1419 0 0 150 0 0 1419 29 1419 0 1419 407 1419 84
Nova Scotia 7147 0 1 6 7 4 6841 129 943 0 2 37 2 0 957 7 957 0 957 89 957 13
New Brunswick 6685 0 0 6 6 0 3925 171 2236 0 0 21 0 0 2229 6 2236 3 2236 31 2145 3
Atlantic 22053 0 1 12 13 4 18986 407 11402 1 5 324 2 152 11411 58 11413 17 11417 2226 4521 100
Région Nord-Est 8994 0 0 0 0 1 4838 1340 585 0 0 6 1 0 596 12 23 0 N.C. N.C. 596 6
Québec-Chaudière-Appalaches 3497 0 0 2 2 4 4054 971 559 0 1 6 4 0 750 29 662 31 N.C. N.C. 575 15
Centre-du-Québec 3552 0 0 3 3 3 3730 1031 314 0 0 9 0 0 314 11 322 5 N.C. N.C. 307 7
Montréal-Laval   11012 0 0 11 11 4 11001 2350 3389 3 1 20 3 0 3389 199 3389 219 N.C. N.C. 3389 25
Ouest du Québec 2823 0 1 3 4 0 2780 873 12 0 0 0 0 0 8 1 11 1 N.C. N.C. 11 1
Montérégie 1881 0 0 1 1 0 1874 380 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 31759 0 1 20 21 12 28277 6945 4859 3 2 41 8 0 5057 252 4407 256 N.C. N.C. 4878 54
P.H.O.L. - Ottawa 5997 2 1 0 3 0 5997 1407 5997 0 0 0 0 726 5997 309 5996 38 5997 2198 5996 219
EORLA 3035 0 0 0 0 0 3010 474 431 0 0 17 0 0 431 6 112 0 431 98 108 8
P.H.O.L. - Kingston 809 0 0 0 0 0 808 73 807 0 0 0 0 129 807 13 806 2 807 267 806 43
UHN / Mount Sinai Hospital 6896 0 0 6 6 0 6896 52 212 0 0 0 0 0 212 0 212 0 212 8 212 2
P.H.O.L. - Toronto   4442 0 10 0 10 0 4430 191 4430 0 0 0 0 241 4431 45 4429 8 4430 751 4430 87
Sick Kids Hospital - Toronto 702 0 0 0 0 0 0 0 702 0 0 68 0 0 702 9 702 1 702 209 702 5
Sunnybrook & Women's College HSC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
P.H.O.L. - Sault Ste. Marie 147 0 1 0 1 0 145 2 145 0 0 0 0 6 145 0 145 0 145 46 145 1
P.H.O.L. - Timmins 137 0 0 0 0 0 137 4 137 0 0 0 0 14 137 1 137 0 137 24 137 2
St. Joseph's - London   3329 0 0 10 10 0 3332 337 1775 0 0 7 0 67 1775 34 1775 4 1729 223 453 1
P.H.O.L. - London 1537 0 3 0 3 0 1534 258 1534 0 0 0 0 134 1534 31 1534 7 1534 352 1534 46
P.H.O.L. - Orillia 441 0 1 0 1 0 441 59 441 0 0 0 0 39 441 16 439 4 441 145 439 14
P.H.O.L. - Thunder Bay 112 0 0 0 0 0 112 5 112 0 0 0 0 8 112 0 112 0 112 42 112 2
P.H.O.L. - Sudbury 188 0 0 0 0 0 188 7 188 0 0 0 0 6 188 1 188 2 188 28 188 4
P.H.O.L. - Hamilton 726 0 7 0 7 0 719 47 719 0 0 0 0 42 719 7 719 4 719 183 719 23
P.H.O.L. - Peterborough 407 0 0 0 0 0 407 37 406 0 0 0 0 10 406 1 404 0 406 73 404 13
St. Joseph's - Hamilton 8344 0 4 5 9 0 8338 1090 8338 2 0 620 0 0 8338 68 8338 18 8338 1362 0 0
Province of Ontario 37249 2 27 21 50 0 36494 4043 26374 2 0 712 0 1422 26375 541 26048 88 26328 6009 16385 470
Manitoba    27785 1 3 3 7 0 27785 292 464 1 2 53 0 0 464 7 1344 4 464 164 1150 3
Province of Saskatchewan 9086 0 1 1 2 0 9065 40 1585 0 0 107 10 0 1585 28 1585 1 1585 309 1584 40
Province of Alberta 30810 0 5 20 25 1 11816 775 11816 0 11 591 97 0 11816 114 11816 22 11816 2177 11816 582
Prairies 67681 1 9 24 34 1 48666 1107 13865 1 13 751 107 0 13865 149 14745 27 13865 2650 14550 625
British Columbia 51697 0 21 3 114 75 51482 4110 9198 0 1 954 90 119 9198 129 9194 41 8972 2006 9021 73
Yukon 3111 0 1 0 4 6 3176 72 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 332 0 0 0 0 0 301 0 41 0 0 0 0 0 41 2 41 0 300 62 41 0
Nunavut 4206 0 0 0 0 0 4201 6 10 0 0 0 0 0 10 1 10 0 10 6 10 0
Territories 7649 0 1 0 4 6 7678 78 51 0 0 0 0 0 51 3 51 0 310 68 51 0
CANADA 218088 3 60 80 236 98 191583 16690 65749 7 21 2782 207 1693 65957 1132 65858 429 60892 12959 49406 1322

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: Included in the cumulative detections this season are 11 co-infections of influenza A and B (total of 22 detections) that are suspected to be associated with recent live attenuated influenza vaccine (LAIV) receipt. Co-infections known or reported to be associated with recent LAIV are removed by the submitting laboratory or by PHAC beginning in week 44 as they do not represent community transmission of seasonal influenza viruses.

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

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 7.33 0.04 4.43 1.29 2.59 9.97 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 22.40 9.70 23.08 15.17 20.56 2.54 0.03 2.74 0.52 0.96
46 2021-11-20 0.10 0.03 13.95 1.42 5.47 0.05 0.01 1.49 0.09 0.58 7.49 0.06 6.33 1.38 3.29 8.29 0.04 5.72 1.62 4.19 2.51 0.30 2.90 1.99 2.53 0.99 0.04 1.43 0.18 0.79 21.37 9.02 22.77 15.28 19.27 3.05 0.03 3.32 0.46 1.25
47 2021-11-27 0.16 0.03 15.24 1.25 6.91 0.07 0.04 2.13 0.13 0.80 8.47 0.03 8.69 1.79 4.46 7.04 0.06 7.00 2.36 4.72 1.94 0.32 2.95 1.83 2.35 1.01 0.02 2.02 0.09 0.89 18.53 8.44 20.84 12.15 16.09 3.93 0.04 3.26 0.37 1.25
48 04/12/2021 0.20 0.04 18.07 0.76 9.40 0.15 0.01 3.18 0.08 1.20 9.32 0.02 9.47 3.11 5.72 5.77 0.02 6.14 3.03 4.18 1.89 0.35 3.34 1.66 2.48 1.48 0.02 1.94 0.31 1.08 16.61 7.94 16.72 12.69 13.83 4.96 0.02 4.30 1.00 2.04
49 11/12/2021 0.23 0.03 19.52 1.43 11.41 0.05 0.01 4.21 0.19 1.60 10.51 0.06 12.26 4.87 7.12 3.98 0.00 5.65 2.94 4.19 2.47 0.54 3.03 1.84 2.49 1.23 0.05 2.80 0.49 1.46 14.47 6.21 16.32 10.72 13.07 6.62 0.05 5.19 0.84 2.52
50 18/12/2021 0.26 0.01 26.42 1.97 14.27 0.02 0.01 7.95 0.15 2.55 10.78 0.07 13.19 5.39 7.93 3.05 0.06 5.95 2.54 4.27 2.76 0.51 3.27 1.49 2.45 1.13 0.02 3.32 0.46 1.70 11.92 6.62 13.85 8.43 10.90 7.35 0.11 6.04 1.54 3.16

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 29 932 88 1,144 24
46 366 111 44 869 106 1,076 26
47 337 91 48 795 153 1,236 39
48 275 91 72 736 188 1,526 65
49 217 137 69 743 249 1,849 55
50 168 156 63 617 255 2,139 63

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 17547 0.08 0.06 1195 0.00 0.00 2441 0.04 0.00 2836 0.07 0.00 5278 0.08 0.00 5054 0.14 0.18 743 0.00 0.13
46 2021-11-20 16418 0.10 0.05 1826 0.00 0.00 2261 0.00 0.04 2619 0.19 0.00 4930 0.04 0.00 4339 0.21 0.18 443 0.23 0.00
47 2021-11-27 16924 0.16 0.07 2042 0.05 0.05 2584 0.12 0.04 2985 0.30 0.00 4843 0.00 0.00 4200 0.33 0.24 270 0.00 0.00
48 04/12/2021 18564 0.20 0.15 3195 0.13 0.09 2471 0.08 0.04 3069 0.20 0.00 4732 0.06 0.00 4846 0.45 0.50 251 0.00 0.00
49 11/12/2021 19915 0.23 0.05 3417 0.09 0.00 2880 0.31 0.14 3350 0.24 0.00 4781 0.25 0.00 5172 0.27 0.10 315 0.00 0.00
50 18/12/2021 22303 0.26 0.02 2166 0.23 0.00 2759 0.14 0.00 3822 0.37 0.00 4677 0.13 0.02 8631 0.35 0.03 248 0.00 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 15615 7.33 837 0.84 2239 18.49 2767 9.97 4011 1.75 5024 7.48 737 0.14
46 2021-11-20 14367 7.49 1259 2.54 2064 12.74 2556 13.38 3734 2.25 4312 8.23 442 0.00
47 2021-11-27 14585 8.47 1607 2.68 2132 11.16 2907 13.62 3511 3.87 4160 10.17 268 0.00
48 04/12/2021 16377 9.32 2884 2.67 2164 8.27 3002 14.69 3273 4.67 4806 13.82 248 4.84
49 11/12/2021 17601 10.51 2979 3.63 2519 6.95 3354 19.11 3312 6.19 5134 13.63 303 6.60
50 18/12/2021 19848 10.78 1442 8.18 2354 5.61 3813 15.53 3388 7.38 8604 11.73 247 15.38

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 4483 9.97 708 6.78 317 0.95 1772 8.47 864 9.72 819 19.78
46 2021-11-20 4413 8.29 597 4.02 349 0.57 1735 6.80 975 9.33 756 17.33
47 2021-11-27 4787 7.04 575 4.35 475 0.84 1968 5.95 1058 7.84 709 15.23
48 04/12/2021 4768 5.77 668 3.29 355 1.13 2055 3.94 960 7.60 723 13.14
49 11/12/2021 5450 3.98 684 1.02 317 0.63 2652 2.94 1063 7.34 733 7.09
50 18/12/2021 5505 3.05 677 2.51 356 1.69 2991 1.60 947 5.81 534 7.87

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 4480 1.61 705 0.71 317 6.62 1772 1.47 864 1.04 819 1.22
46 2021-11-20 4421 2.51 598 0.50 356 7.30 1735 2.25 975 2.05 756 3.04
47 2021-11-27 4693 1.94 576 0.69 380 3.68 1968 2.69 1058 0.76 709 1.69
48 04/12/2021 4816 1.89 668 0.75 403 4.71 2055 1.95 960 1.46 723 1.80
49 11/12/2021 5544 2.47 684 0.88 411 4.87 2652 3.24 1063 1.03 733 1.91
50 18/12/2021 5652 2.76 677 0.74 503 6.56 2991 2.91 947 1.69 534 2.81

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 4537 0.64 705 0.14 325 4.92 1742 0.17 943 0.21 819 0.85
46 2021-11-20 4435 0.99 597 0.17 349 8.02 1704 0.35 1028 0.49 756 0.53
47 2021-11-27 4739 1.01 575 0.52 380 8.68 1968 0.46 1105 0.00 709 0.42
48 04/12/2021 4875 1.48 668 0.45 403 12.90 2055 0.44 1019 0.29 723 0.69
49 11/12/2021 5588 1.23 684 0.88 411 9.98 2651 0.57 1108 0.54 733 0.14
50 18/12/2021 5573 1.13 677 0.30 397 11.08 2990 0.47 975 0.31 534 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 4161 22.40 709 12.83 N.A. N.A. 1766 27.18 864 21.06 812 21.55
46 2021-11-20 4067 21.37 597 13.57 N.A. N.A. 1735 23.34 975 21.85 743 22.21
47 2021-11-27 4290 18.53 575 11.83 N.A. N.A. 1951 21.78 1058 16.07 694 18.88
48 04/12/2021 4431 16.61 668 10.93 N.A. N.A. 2053 18.56 960 15.31 708 17.23
49 11/12/2021 5136 14.47 684 11.11 N.A. N.A. 2643 14.00 1063 14.77 716 18.30
50 18/12/2021 5175 11.92 677 7.68 N.A. N.A. 2991 10.97 947 13.09 527 19.54

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 3464 2.54 326 0.92 317 0.32 1142 2.19 864 6.71 812 0.12
46 2021-11-20 3478 3.05 310 2.90 349 0.86 1047 2.77 1028 4.96 743 1.88
47 2021-11-27 3898 3.93 305 3.61 475 1.47 1317 3.80 1105 6.88 694 1.30
48 04/12/2021 3792 4.96 368 4.89 465 1.94 1225 4.90 1019 8.93 708 1.41
49 11/12/2021 3760 6.62 369 5.42 356 1.97 1211 7.35 1108 11.01 715 1.54
50 18/12/2021 3468 7.35 356 6.18 496 3.02 1114 9.69 975 10.05 527 2.28

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