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Respiratory Virus Report, week 48 - ending December 4, 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 48 (November 28 to December 4, 2021), activity of almost all respiratory viruses are within expected levels for this time of year.

  • Respiratory syncytial virus (1,450 detections; 9.2% positive), enterovirus/rhinovirus (704 detections; 16.7% positive) are the most common seasonal respiratory viruses detected in Canada.
    • Activity of respiratory syncytial virus is now within 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.
  • Detections of other respiratory viruses are low, but activity of human coronavirus has been increasing in recent weeks.
  • The number of tests performed for all 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 4, 2021 (surveillance week 2021-48)
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 300 0 0 0 0 0 300 7 300 0 0 4 0 16 300 0 300 1 300 29 N.C. N.C.
Prince Edward Island 110 0 0 0 0 0 110 15 110 0 0 0 0 0 110 3 110 0 110 36 110 15
Nova Scotia 2000 0 0 2 2 3 2000 21 75 0 0 0 1 0 75 0 75 0 75 7 75 3
New Brunswick 783 0 0 0 0 0 472 34 183 0 0 1 0 0 183 2 183 2 183 1 183 0
Atlantic 3193 0 0 2 2 3 2882 77 668 0 0 5 1 16 668 5 668 3 668 73 368 18
Région Nord-Est 620 0 0 0 0 1 374 58 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 89 1
Québec-Chaudière-Appalaches 351 0 0 1 1 0 346 34 43 0 1 1 1 0 91 3 91 7 N.C. N.C. 64 5
Centre-du-Québec 330 0 0 1 1 0 279 10 14 0 0 0 0 0 14 0 14 0 N.C. N.C. 14 0
Montréal-Laval   811 0 0 0 0 0 806 41 295 0 0 1 0 0 295 15 295 44 N.C. N.C. 295 2
Ouest du Québec 194 0 0 0 0 0 194 23 3 0 0 0 0 0 3 1 3 1 N.C. N.C. 3 1
Montérégie 165 0 0 0 0 0 165 13 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 2471 0 0 2 2 1 2164 179 355 0 1 2 1 0 403 19 403 52 N.C. N.C. 465 9
P.H.O.L. - Ottawa 287 0 0 0 0 0 287 63 287 0 0 0 0 29 287 22 287 8 287 104 287 19
EORLA 271 0 0 0 0 0 271 60 31 0 0 2 0 0 31 2 31 0 31 8 31 4
P.H.O.L. - Kingston 86 0 0 0 0 0 86 14 86 0 0 0 0 5 86 1 86 0 86 20 86 12
UHN / Mount Sinai Hospital 478 0 0 1 1 0 478 6 12 0 0 0 0 0 12 0 12 0 12 0 12 0
P.H.O.L. - Toronto   360 0 1 0 1 0 359 25 359 0 0 0 0 11 359 2 359 0 359 53 359 9
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 21 0 0 0 0 0 21 0 21 0 0 0 0 0 21 0 21 0 21 9 21 0
P.H.O.L. - Timmins 11 0 0 0 0 0 11 1 11 0 0 0 0 5 11 0 11 0 11 2 11 0
St. Joseph's - London   342 0 0 1 1 0 342 37 36 0 0 0 0 1 36 1 36 0 34 12 8 0
P.H.O.L. - London 183 0 0 0 0 0 183 67 183 0 0 0 0 5 183 4 183 0 183 27 183 7
P.H.O.L. - Orillia 55 0 0 0 0 0 55 8 55 0 0 0 0 2 55 2 55 0 55 11 55 2
P.H.O.L. - Thunder Bay 4 0 0 0 0 0 4 0 4 0 0 0 0 0 4 0 4 0 4 0 4 0
P.H.O.L. - Sudbury 15 0 0 0 0 0 15 0 15 0 0 0 0 2 15 0 15 0 15 0 15 0
P.H.O.L. - Hamilton 61 0 1 0 1 0 61 7 61 0 0 0 0 1 61 0 61 0 61 12 61 3
P.H.O.L. - Peterborough 31 0 0 0 0 0 31 5 31 0 0 0 0 1 31 0 31 0 31 6 31 2
St. Joseph's - Hamilton 802 0 0 2 2 0 802 148 802 0 0 14 0 0 802 5 802 1 802 102 0 0
Province of Ontario 3007 0 2 4 6 0 3006 441 1994 0 0 16 0 62 1994 39 1994 9 1992 366 1164 58
Province of Manitoba 1763 0 0 0 0 0 1763 31 28 0 1 4 0 0 28 0 87 0 28 6 87 0
Province of Saskatchewan 666 0 0 0 0 0 665 3 145 0 0 18 1 0 145 4 145 0 145 20 145 5
Province of Alberta 2145 0 1 0 1 0 734 115 734 0 6 30 9 0 734 9 734 2 734 117 734 77
Prairies 4574 0 1 0 1 0 3162 149 907 0 7 52 10 0 907 13 966 2 907 143 966 82
British Columbia 4325 0 4 0 22 24 4285 592 618 0 0 55 18 14 618 11 618 3 603 109 603 8
Yukon 24 0 0 0 0 0 24 12 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 43 0 0 0 0 0 40 0 5 0 0 0 0 0 5 0 5 0 40 12 5 0
Nunavut 148 0 0 0 0 0 148 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.
Territories 215 0 0 0 0 0 212 12 7 0 0 0 0 0 7 0 7 0 42 13 7 0
CANADA 17785 0 7 8 33 28 15711 1450 4549 0 8 130 30 92 4597 87 4656 69 4212 704 3573 175

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 4, 2021 (surveillance weeks 2021-35 to 2021-48)
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 6166 0 0 0 0 0 6165 18 6168 1 3 113 0 135 6170 14 6165 6 6169 1644 N.C. N.C.
Prince Edward Island 1152 0 0 0 0 0 1152 24 1152 0 0 147 0 0 1152 23 1152 0 1152 348 1152 52
Nova Scotia 4147 0 1 2 3 4 4147 67 814 0 2 37 1 0 828 5 828 0 828 80 828 6
New Brunswick 5003 0 0 0 0 0 3099 72 1907 0 0 21 0 0 1900 5 1907 3 1907 26 1816 0
Atlantic 16468 0 1 2 3 4 14563 181 10041 1 5 318 1 135 10050 47 10052 9 10056 2098 3796 58
Région Nord-Est 7502 0 0 0 0 1 4011 1260 579 0 0 6 1 0 484 11 17 0 N.C. N.C. 484 4
Québec-Chaudière-Appalaches 2825 0 0 1 1 3 3393 927 475 0 1 6 2 0 531 19 443 9 N.C. N.C. 418 10
Centre-du-Québec 2441 0 0 2 2 1 2682 980 276 0 0 9 0 0 276 6 284 4 N.C. N.C. 269 3
Montréal-Laval   9502 0 0 5 5 3 9500 2287 2844 2 1 17 1 0 2844 162 2844 157 N.C. N.C. 2844 14
Ouest du Québec 2404 0 0 0 0 0 2372 830 12 0 0 0 0 0 8 1 11 1 N.C. N.C. 11 1
Montérégie 1446 0 0 0 0 0 1446 354 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 26120 0 0 8 8 8 23404 6638 4186 2 2 38 4 0 4143 199 3599 171 N.C. N.C. 4026 32
P.H.O.L. - Ottawa 5305 1 1 0 2 0 5305 1236 5305 0 0 0 0 673 5305 223 5304 29 5305 1992 5304 141
EORLA 2498 0 0 0 0 0 2473 378 379 0 0 15 0 0 379 4 60 0 379 84 56 5
P.H.O.L. - Kingston 736 0 0 0 0 0 736 54 735 0 0 0 0 129 735 13 734 2 735 255 734 32
UHN / Mount Sinai Hospital 5910 0 0 4 4 0 5910 30 190 0 0 0 0 0 190 0 190 0 190 8 190 0
P.H.O.L. - Toronto   3814 0 7 0 7 0 3808 126 3808 0 0 0 0 230 3809 32 3808 4 3808 685 3809 54
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 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 117 0 1 0 1 0 115 0 115 0 0 0 0 5 115 0 115 0 115 39 115 0
P.H.O.L. - Timmins 104 0 0 0 0 0 104 3 104 0 0 0 0 12 104 1 104 0 104 16 104 0
St. Joseph's - London   1984 0 0 1 1 0 1983 119 501 0 0 7 0 57 501 12 501 1 464 120 437 1
P.H.O.L. - London 1167 0 0 0 0 0 1167 136 1167 0 0 0 0 123 1167 19 1167 1 1167 310 1167 15
P.H.O.L. - Orillia 341 0 1 0 1 0 341 29 341 0 0 0 0 36 341 10 339 3 341 122 339 4
P.H.O.L. - Thunder Bay 89 0 0 0 0 0 89 0 89 0 0 0 0 6 89 0 89 0 89 33 89 1
P.H.O.L. - Sudbury 166 0 0 0 0 0 166 3 166 0 0 0 0 4 166 0 166 2 166 25 166 3
P.H.O.L. - Hamilton 541 0 6 0 6 0 534 26 534 0 0 0 0 35 534 4 534 4 534 147 534 6
P.H.O.L. - Peterborough 320 0 0 0 0 0 320 26 319 0 0 0 0 9 319 1 318 0 319 62 318 6
St. Joseph's - Hamilton 6286 0 4 2 6 0 6280 644 6280 2 0 599 0 0 6280 41 6280 12 6280 1204 0 0
Province of Ontario 29945 1 20 7 28 0 29331 2810 20600 2 0 682 0 1319 20601 367 20276 59 20563 5272 13929 269
Manitoba    24113 1 3 3 7 0 24113 176 365 1 2 39 0 0 365 6 1172 3 365 151 931 2
Province of Saskatchewan 7625 0 0 0 0 0 7605 30 1300 0 0 72 8 0 1300 23 1300 1 1300 259 1299 12
Province of Alberta 26326 0 3 4 7 0 10136 442 10136 0 11 528 74 0 10136 92 10136 13 10136 1955 10136 382
Prairies 58064 1 6 7 14 0 41854 648 11801 1 13 639 82 0 11801 121 12608 17 11801 2365 12366 396
British Columbia 37373 0 15 3 70 67 37223 2329 7826 0 0 886 76 100 7826 98 7822 38 7624 1759 7674 48
Yukon 3003 0 1 0 4 6 3068 16 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 257 0 0 0 0 0 238 0 40 0 0 0 0 0 40 2 40 0 237 43 40 0
Nunavut 3790 0 0 0 0 0 3786 4 10 0 0 0 0 0 10 1 10 0 10 6 10 0
Territories 7050 0 1 0 4 6 7092 20 50 0 0 0 0 0 50 3 50 0 247 49 50 0
CANADA 175020 2 43 27 127 85 153467 12626 54504 6 20 2563 163 1554 54471 835 54407 294 50291 11543 41841 803

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.

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 8.48 0.03 8.69 1.79 4.46 7.06 0.06 7.00 2.36 4.72 1.97 0.32 2.95 1.83 2.35 1.03 0.02 2.02 0.09 0.89 18.27 8.44 20.84 12.15 16.09 3.99 0.04 3.26 0.37 1.25
48 2021-12-04 0.19 0.04 18.07 0.76 9.40 0.16 0.01 3.18 0.08 1.20 9.23 0.02 9.47 3.11 5.72 5.72 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 16.71 7.94 16.72 12.69 13.83 4.90 0.02 4.30 1.00 2.04

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
47 333 91 48 771 151 1,236 39
48 260 87 69 704 175 1,450 61

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 16853 0.16 0.07 2042 0.05 0.05 2584 0.12 0.04 2915 0.31 0.00 4842 0.00 0.00 4200 0.33 0.24 270 0.00 0.00
48 2021-12-04 17785 0.19 0.16 3193 0.06 0.09 2471 0.08 0.04 3007 0.20 0.00 4574 0.02 0.00 4325 0.51 0.55 215 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 14584 8.48 1607 2.68 2132 11.16 2907 13.62 3510 3.87 4160 10.17 268 0.00
48 2021-12-04 15711 9.23 2882 2.67 2164 8.27 3006 14.67 3162 4.71 4285 13.82 212 5.66

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 4716 7.06 575 4.35 475 0.84 1898 5.95 1057 7.85 709 15.23
48 2021-12-04 4549 5.72 668 3.29 355 1.13 1994 3.91 907 7.61 618 14.08

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 4622 1.97 576 0.69 380 3.68 1898 2.79 1057 0.76 709 1.69
48 2021-12-04 4597 1.89 668 0.75 403 4.71 1994 1.96 907 1.43 618 1.78

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 4668 1.03 575 0.52 380 8.68 1898 0.47 1104 0.00 709 0.42
48 2021-12-04 4656 1.48 668 0.45 403 12.90 1994 0.45 966 0.21 618 0.49

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 4219 18.27 575 11.83 N.A. N.A. 1881 21.32 1057 16.08 694 18.88
48 2021-12-04 4212 16.71 668 10.93 N.A. N.A. 1992 18.37 907 15.77 603 18.08

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 3780 3.99 305 3.61 475 1.47 1247 3.85 1057 7.19 694 1.30
48 2021-12-04 3573 4.90 368 4.89 465 1.94 1164 4.98 966 8.49 603 1.33

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