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Respiratory Virus Report, week 49 - ending December 11, 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 49 (December 5 to December 11, 2021), activity of almost all respiratory viruses are within expected levels for this time of year.

  • Respiratory syncytial virus (1,749 detections; 10.3% positive), enterovirus/rhinovirus (680 detections; 14.6% 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 all viruses are above expected levels.
  • 31/34 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 11, 2021 (surveillance week 2021-49)
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 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.C. N.C.
Prince Edward Island 117 0 0 0 0 0 117 16 117 0 0 0 0 0 117 3 117 0 117 37 117 18
Nova Scotia 2106 0 0 1 1 0 2106 38 101 0 0 0 0 0 101 0 101 0 101 5 101 1
New Brunswick 879 0 0 2 2 0 441 45 151 0 0 0 0 0 151 1 151 0 151 4 151 1
Atlantic 3102 0 0 3 3 0 2664 99 369 0 0 0 0 0 369 4 369 0 369 46 369 20
Région Nord-Est 797 0 0 0 0 0 481 54 5 0 0 0 0 0 5 0 5 0 N.C. N.C. 5 0
Québec-Chaudière-Appalaches 365 0 0 1 1 1 365 26 39 0 0 0 0 0 133 3 133 12 N.C. N.C. 78 1
Centre-du-Québec 532 0 0 0 0 2 503 26 19 0 0 0 0 0 19 2 19 0 N.C. N.C. 19 2
Montréal-Laval   741 0 0 5 5 1 739 34 254 0 0 2 0 0 254 15 254 29 N.C. N.C. 254 4
Ouest du Québec 197 0 1 2 3 0 186 18 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Montérégie 248 0 0 0 0 0 245 17 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 2880 0 1 8 9 4 2519 175 317 0 0 2 0 0 411 20 411 41 N.C. N.C. 356 7
P.H.O.L. - Ottawa 369 0 0 0 0 0 369 99 369 0 0 0 0 37 369 46 369 4 369 112 369 32
EORLA 237 0 0 0 0 0 237 47 26 0 0 2 0 0 26 1 26 0 26 11 26 3
P.H.O.L. - Kingston 36 0 0 0 0 0 36 10 36 0 0 0 0 0 36 0 36 0 36 11 36 6
UHN / Mount Sinai Hospital 429 0 0 2 2 0 429 9 13 0 0 0 0 0 13 0 13 0 13 0 13 1
P.H.O.L. - Toronto   328 0 0 0 0 0 328 41 328 0 0 0 0 5 328 7 327 4 328 41 327 14
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 0 15 0 0 0 0 0 15 0 15 0 15 5 15 0
P.H.O.L. - Timmins 9 0 0 0 0 0 9 0 9 0 0 0 0 2 9 0 9 0 9 1 9 0
St. Joseph's - London   525 0 0 2 2 0 529 95 454 0 0 0 0 6 454 10 454 1 445 44 9 0
P.H.O.L. - London 182 0 0 0 0 0 182 60 182 0 0 0 0 6 182 6 182 2 182 25 182 12
P.H.O.L. - Orillia 47 0 0 0 0 0 47 13 47 0 0 0 0 3 47 2 47 0 47 15 47 5
P.H.O.L. - Thunder Bay 10 0 0 0 0 0 10 1 10 0 0 0 0 1 10 0 10 0 10 4 10 1
P.H.O.L. - Sudbury 16 0 0 0 0 0 16 3 16 0 0 0 0 2 16 1 16 0 16 1 16 1
P.H.O.L. - Hamilton 110 0 1 0 1 0 110 10 110 0 0 0 0 3 110 3 110 0 110 20 110 12
P.H.O.L. - Peterborough 43 0 0 0 0 0 43 5 43 0 0 0 0 0 43 0 43 0 43 8 43 2
St. Joseph's - Hamilton 995 0 0 3 3 0 995 248 995 0 0 12 0 0 995 10 995 4 995 72 0 0
Province of Ontario 3351 0 1 7 8 0 3355 641 2653 0 0 14 0 65 2653 86 2652 15 2644 370 1212 89
Province of Manitoba    1745 0 0 0 0 0 1745 41 40 0 0 9 0 0 40 0 85 1 40 10 85 0
Province of Saskatchewan 645 0 0 0 0 0 645 5 146 0 0 17 0 0 146 3 146 0 146 22 146 17
Province of Alberta 2251 0 1 11 12 0 816 152 816 0 1 32 11 0 816 8 816 3 816 117 816 92
Prairies 4641 0 1 11 12 0 3206 198 1002 0 1 58 11 0 1002 11 1047 4 1002 149 1047 109
British Columbia 4920 0 3 0 14 5 4882 616 630 0 1 23 10 10 630 10 630 1 613 106 612 10
Yukon 243 0 0 0 0 0 243 19 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 32 0 0 0 0 0 30 0 1 0 0 0 0 0 1 0 1 0 30 9 1 0
Nunavut 162 0 0 0 0 0 162 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 437 0 0 0 0 0 435 20 1 0 0 0 0 0 1 0 1 0 30 9 1 0
CANADA 19331 0 6 29 46 9 17061 1749 4972 0 2 97 21 75 5066 131 5110 61 4658 680 3597 235

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 11, 2021 (surveillance weeks 2021-35 to 2021-49)
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 1269 0 0 0 0 0 1269 40 1269 0 0 147 0 0 1269 26 1269 0 1269 385 1269 70
Nova Scotia 6253 0 1 3 4 4 6253 105 915 0 2 37 1 0 929 5 929 0 929 85 929 7
New Brunswick 5882 0 0 2 2 0 3540 117 2058 0 0 21 0 0 2051 6 2058 3 2058 30 1967 1
Atlantic 19570 0 1 5 6 4 17227 280 10410 1 5 318 1 135 10419 51 10421 9 10425 2144 4165 78
Région Nord-Est 8299 0 0 0 0 1 4492 1314 584 0 0 6 1 0 489 11 22 0 N.C. N.C. 489 4
Québec-Chaudière-Appalaches 3190 0 0 2 2 4 3758 953 514 0 1 6 2 0 664 22 576 21 N.C. N.C. 496 11
Centre-du-Québec 2973 0 0 2 2 3 3185 1006 295 0 0 9 0 0 295 8 303 4 N.C. N.C. 288 5
Montréal-Laval   10243 0 0 10 10 4 10239 2321 3098 2 1 19 1 0 3098 177 3098 186 N.C. N.C. 3098 18
Ouest du Québec 2601 0 1 2 3 0 2558 848 12 0 0 0 0 0 8 1 11 1 N.C. N.C. 11 1
Montérégie 1694 0 0 0 0 0 1691 371 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 29000 0 1 16 17 12 25923 6813 4503 2 2 40 4 0 4554 219 4010 212 N.C. N.C. 4382 39
P.H.O.L. - Ottawa 5674 1 1 0 2 0 5674 1335 5674 0 0 0 0 710 5674 269 5673 33 5674 2104 5673 173
EORLA 2735 0 0 0 0 0 2710 425 405 0 0 17 0 0 405 5 86 0 405 95 82 8
P.H.O.L. - Kingston 772 0 0 0 0 0 772 64 771 0 0 0 0 129 771 13 770 2 771 266 770 38
UHN / Mount Sinai Hospital 6339 0 0 6 6 0 6339 39 203 0 0 0 0 0 203 0 203 0 203 8 203 1
P.H.O.L. - Toronto   4141 0 7 0 7 0 4135 167 4135 0 0 0 0 235 4136 38 4134 8 4135 726 4135 68
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 132 0 1 0 1 0 130 0 130 0 0 0 0 5 130 0 130 0 130 44 130 0
P.H.O.L. - Timmins 113 0 0 0 0 0 113 3 113 0 0 0 0 14 113 1 113 0 113 17 113 0
St. Joseph's - London   2509 0 0 3 3 0 2512 214 955 0 0 7 0 63 955 22 955 2 909 164 446 1
P.H.O.L. - London 1349 0 0 0 0 0 1349 196 1349 0 0 0 0 129 1349 25 1349 3 1349 335 1349 27
P.H.O.L. - Orillia 388 0 1 0 1 0 388 42 388 0 0 0 0 39 388 12 386 3 388 137 386 9
P.H.O.L. - Thunder Bay 99 0 0 0 0 0 99 1 99 0 0 0 0 7 99 0 99 0 99 37 99 2
P.H.O.L. - Sudbury 182 0 0 0 0 0 182 6 182 0 0 0 0 6 182 1 182 2 182 26 182 4
P.H.O.L. - Hamilton 651 0 7 0 7 0 644 36 644 0 0 0 0 38 644 7 644 4 644 167 644 18
P.H.O.L. - Peterborough 363 0 0 0 0 0 363 31 362 0 0 0 0 9 362 1 361 0 362 70 361 8
St. Joseph's - Hamilton 7281 0 4 5 9 0 7275 892 7275 2 0 611 0 0 7275 51 7275 16 7275 1276 0 0
Province of Ontario 33430 1 21 14 36 0 32685 3451 23387 2 0 703 0 1384 23388 454 23062 74 23341 5681 15275 362
Manitoba    25858 1 3 3 7 0 25858 217 405 1 2 48 0 0 405 6 1257 4 405 161 1063 2
Province of Saskatchewan 8328 0 1 0 1 0 8308 35 1446 0 0 89 8 0 1446 26 1446 1 1446 281 1445 29
Province of Alberta 28678 0 4 16 20 0 11006 598 11006 0 11 563 87 0 11006 101 11006 17 11006 2076 11006 483
Prairies 62864 1 8 19 28 0 45172 850 12857 1 13 700 95 0 12857 133 13709 22 12857 2518 13514 514
British Columbia 42656 0 19 3 84 72 42468 2945 8561 0 1 915 87 110 8561 110 8557 41 8342 1878 8391 60
Yukon 3413 0 1 0 4 6 3478 35 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 289 0 0 0 0 0 268 0 41 0 0 0 0 0 41 2 41 0 267 52 41 0
Nunavut 3982 0 0 0 0 0 3978 5 10 0 0 0 0 0 10 1 10 0 10 6 10 0
Territories 7684 0 1 0 4 6 7724 40 51 0 0 0 0 0 51 3 51 0 277 58 51 0
CANADA 195204 2 51 57 175 94 171199 14379 59769 6 21 2676 187 1629 59830 970 59810 358 55242 12279 45778 1053

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 2021-12-04 0.19 0.04 18.07 0.76 9.40 0.15 0.01 3.18 0.08 1.20 8.88 0.02 9.47 3.11 5.72 5.74 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 16.60 7.94 16.72 12.69 13.83 4.95 0.02 4.30 1.00 2.04
49 2021-12-11 0.24 0.03 19.52 1.43 11.41 0.05 0.01 4.21 0.19 1.60 10.25 0.06 12.26 4.87 7.12 3.92 0.00 5.65 2.94 4.19 2.59 0.54 3.03 1.84 2.49 1.19 0.05 2.80 0.49 1.46 14.60 6.21 16.32 10.72 13.07 6.53 0.05 5.19 0.84 2.52

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
48 274 91 72 736 188 1,454 63
49 195 131 61 680 235 1,749 55

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 2021-12-04 18567 0.19 0.15 3193 0.06 0.09 2471 0.08 0.04 3071 0.20 0.00 4732 0.06 0.00 4688 0.47 0.51 412 0.00 0.00
49 2021-12-11 19331 0.24 0.05 3102 0.10 0.00 2880 0.31 0.14 3351 0.24 0.00 4641 0.26 0.00 4920 0.28 0.10 437 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 2021-12-04 16381 8.88 2882 2.67 2164 8.27 3005 14.68 3273 4.67 4648 12.74 409 2.93
49 2021-12-11 17061 10.25 2664 3.72 2519 6.95 3355 19.11 3206 6.18 4882 12.62 435 4.60

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 2021-12-04 4771 5.74 668 3.29 355 1.13 2058 3.94 960 7.60 723 13.00
49 2021-12-11 4972 3.92 369 0.00 317 0.63 2653 2.98 1002 6.99 630 6.98

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 2021-12-04 4819 1.89 668 0.75 403 4.71 2058 1.94 960 1.46 723 1.80
49 2021-12-11 5066 2.59 369 1.08 411 4.87 2653 3.24 1002 1.10 630 1.59

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 2021-12-04 4878 1.48 668 0.45 403 12.90 2058 0.44 1019 0.29 723 0.69
49 2021-12-11 5110 1.19 369 0.00 411 9.98 2652 0.57 1047 0.38 630 0.16

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 2021-12-04 4434 16.60 668 10.93 N.A. N.A. 2056 18.53 960 15.31 708 17.23
49 2021-12-11 4658 14.60 369 12.47 N.A. N.A. 2644 13.99 1002 14.87 613 17.29

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 2021-12-04 3795 4.95 368 4.89 465 1.94 1228 4.89 1019 8.93 708 1.41
49 2021-12-11 3597 6.53 369 5.42 356 1.97 1212 7.34 1047 10.41 612 1.63

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