Respiratory Virus Report, week 52 - ending January 1, 2022

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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 52 (December 26, 2021 to January 1, 2022), activity of almost all respiratory viruses is within or below expected levels for this time of year.

  • Due to the current COVID-19 pandemic, changes in laboratory testing practices for the past week may affect the comparability of data to previous weeks.
  • Respiratory syncytial virus (1,824 detections; 6.8% positive) is the most common seasonal respiratory viruses detected in Canada. Activity remains within expected levels.
  • Detections of other respiratory viruses are low, but activity of seasonal human coronavirus (297 detections; 10.3% positive) is far above expected levels.
  • The number of tests performed for each virus is either within or 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 January 1, 2022 (surveillance week 2021-52)
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 8 0 0 0 0 0 8 1 8 0 0 0 0 0 9 0 8 0 8 0 N.C. N.C.
Prince Edward Island 87 0 0 0 0 0 87 19 87 0 0 1 0 0 87 4 87 1 87 15 87 12
Nova Scotia 1283 0 0 4 4 0 1283 41 37 0 0 0 1 0 37 1 37 1 37 0 37 6
New Brunswick 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.
Atlantic 1378 0 0 4 4 0 1378 61 132 0 0 1 1 0 133 5 132 2 132 15 124 18
Région Nord-Est 732 0 0 0 0 0 107 8 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Québec-Chaudière-Appalaches 166 0 0 2 2 0 166 0 31 0 0 0 0 0 73 0 73 0 N.C. N.C. 72 0
Centre-du-Québec 237 0 0 0 0 0 233 15 7 0 0 0 0 0 7 0 7 1 N.C. N.C. 7 0
Montréal-Laval   1052 0 0 6 6 0 1034 21 244 0 0 0 0 0 244 18 241 32 N.C. N.C. 241 8
Ouest du Québec 273 0 0 0 0 0 273 24 5 0 0 1 0 0 0 0 0 0 N.C. N.C. 0 0
Montérégie 100 0 0 0 0 0 100 1 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 2560 0 0 8 8 0 1913 69 287 0 0 1 0 0 324 18 321 33 N.C. N.C. 320 8
P.H.O.L. - Ottawa 49 0 0 0 0 0 49 5 49 0 0 0 0 1 49 0 49 0 49 0 49 5
EORLA 259 0 0 0 0 0 259 30 19 0 0 0 0 0 19 2 19 2 19 4 19 0
P.H.O.L. - Kingston 44 0 0 0 0 0 44 10 44 0 0 0 0 0 44 2 44 0 44 1 44 4
UHN / Mount Sinai Hospital 694 0 0 1 1 0 694 6 16 0 0 0 0 0 16 0 16 0 16 0 16 0
P.H.O.L. - Toronto   285 0 1 0 1 0 285 12 285 0 0 0 0 2 286 6 285 1 285 23 285 31
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 6 0 0 0 0 0 6 1 6 0 0 0 0 1 6 1 6 0 6 0 6 0
P.H.O.L. - Timmins 18 0 0 0 0 0 18 1 18 0 0 0 0 1 18 0 18 0 18 0 18 0
St. Joseph's - London   895 0 0 1 1 0 895 98 895 0 0 0 0 5 895 12 895 2 895 53 3 0
P.H.O.L. - London 162 0 2 0 2 0 160 51 160 0 0 0 0 2 160 6 160 0 160 14 160 35
P.H.O.L. - Orillia 42 0 0 0 0 0 42 13 42 0 0 0 0 1 42 0 42 1 42 3 42 7
P.H.O.L. - Thunder Bay 15 0 0 0 0 0 15 2 15 0 0 0 0 1 15 0 15 0 15 2 15 3
P.H.O.L. - Sudbury 7 0 0 0 0 0 7 0 7 0 0 0 0 0 7 0 7 0 7 0 7 0
P.H.O.L. - Hamilton 44 0 0 0 0 0 44 3 44 0 0 0 0 1 44 0 44 0 44 0 44 10
P.H.O.L. - Peterborough 15 0 0 0 0 0 15 2 15 0 0 0 0 0 15 0 15 0 15 2 15 9
St. Joseph's - Hamilton 1072 0 0 2 2 0 1072 132 1072 0 0 8 0 0 1072 10 1072 3 1072 42 0 0
Province of Ontario 3607 0 3 4 7 0 3605 366 2687 0 0 8 0 15 2688 39 2687 9 2687 144 723 104
Province of Manitoba 2428 0 3 0 3 0 2428 90 88 0 0 3 0 0 88 3 120 0 88 5 120 6
Province of Saskatchewan 1134 0 0 1 1 0 1134 30 165 0 0 23 2 0 165 5 165 0 165 26 165 20
Province of Alberta 2595 0 1 2 3 1 915 305 915 0 3 8 7 0 915 7 915 2 915 86 915 111
Prairies 6157 0 4 3 7 1 4477 425 1168 0 3 34 9 0 1168 15 1200 2 1168 117 1200 137
British Columbia 13474 0 4 0 10 1 13662 860 520 1 0 8 11 4 520 17 520 3 507 60 507 30
Yukon 214 0 0 0 0 0 214 42 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 31 1 1 0 0 0 0 0 1 0 1 0 31 3 1 0
Nunavut 1719 0 0 0 0 0 1719 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 1965 0 0 0 0 0 1964 43 1 0 0 0 0 0 1 0 1 0 31 3 1 0
CANADA 29141 0 11 19 36 2 26999 1824 4795 1 3 52 21 19 4834 94 4861 49 4525 339 2875 297

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 January 1, 2022 (surveillance weeks 2021-35 to 2021-52)
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 7052 0 0 0 0 0 7051 71 7054 1 3 116 0 154 7060 21 7051 23 7055 1724 N.C. N.C.
Prince Edward Island 1506 0 0 0 0 0 1506 78 1506 0 0 151 0 0 1506 33 1506 1 1506 422 1506 96
Nova Scotia 8511 0 1 10 11 4 8511 192 1002 0 2 37 3 0 1016 8 1016 1 1016 91 1016 25
New Brunswick 7294 0 0 6 6 0 4243 190 2283 0 0 21 0 0 2276 6 2283 3 2283 32 2192 4
Atlantic 24363 0 1 16 17 4 21311 531 11845 1 5 325 3 154 11858 68 11856 28 11860 2269 4714 125
Région Nord-Est 10663 0 0 0 0 2 5310 1397 585 0 0 6 1 0 596 12 23 0 N.C. N.C. 596 6
Québec-Chaudière-Appalaches 3696 0 0 4 4 4 4253 975 590 0 1 6 4 0 823 29 735 31 N.C. N.C. 647 15
Centre-du-Québec 4252 0 0 3 3 4 4422 1063 341 0 0 19 0 0 341 12 349 12 N.C. N.C. 334 7
Montréal-Laval   13321 0 0 31 31 4 13286 2401 3991 3 2 20 4 0 3991 244 3988 291 N.C. N.C. 3988 44
Ouest du Québec 3311 0 1 6 7 0 3268 913 22 0 0 2 0 0 8 1 11 1 N.C. N.C. 11 1
Montérégie 2125 0 0 2 2 0 2118 384 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 37368 0 1 46 47 14 32657 7133 5529 3 3 53 9 0 5759 298 5106 335 N.C. N.C. 5576 73
P.H.O.L. - Ottawa 6116 2 1 0 3 0 6116 1418 6116 0 0 0 0 727 6116 309 6115 38 6116 2201 6115 233
EORLA 3570 0 0 0 0 0 3545 549 477 0 1 17 0 0 477 8 158 2 477 105 154 11
P.H.O.L. - Kingston 889 0 0 0 0 0 888 89 887 0 0 0 0 129 887 16 886 2 887 271 886 56
UHN / Mount Sinai Hospital 8367 0 0 8 8 0 8367 73 256 0 0 0 0 0 256 0 256 0 256 8 256 2
P.H.O.L. - Toronto   5074 0 11 0 11 0 5062 230 5062 0 0 0 0 257 5064 63 5061 9 5062 811 5062 144
Sick Kids Hospital - Toronto 839 0 0 0 0 0 0 0 839 0 2 68 1 0 839 12 839 1 839 233 839 10
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 161 0 1 0 1 0 159 4 159 0 0 0 0 7 159 1 159 0 159 46 159 1
P.H.O.L. - Timmins 177 0 0 0 0 0 177 6 177 0 0 0 0 15 177 1 177 0 177 28 177 5
St. Joseph's - London   5164 0 0 13 13 0 5167 572 3610 0 0 7 0 81 3610 63 3610 8 3564 321 462 1
P.H.O.L. - London 1879 0 5 0 5 0 1873 369 1873 0 0 0 0 138 1873 44 1873 7 1873 379 1873 108
P.H.O.L. - Orillia 523 0 1 0 1 0 523 83 523 0 0 0 0 41 523 19 521 5 523 153 521 29
P.H.O.L. - Thunder Bay 164 0 0 0 0 0 164 15 164 0 0 0 0 17 164 0 164 0 164 46 164 7
P.H.O.L. - Sudbury 197 0 0 0 0 0 197 7 197 0 0 0 0 6 197 1 197 2 197 27 197 4
P.H.O.L. - Hamilton 825 0 7 0 7 0 818 54 818 0 0 0 0 43 818 7 818 4 818 190 818 39
P.H.O.L. - Peterborough 454 0 0 0 0 0 454 44 453 0 0 0 0 11 453 1 451 0 453 79 451 27
St. Joseph's - Hamilton 10599 0 4 7 11 0 10593 1445 10593 2 0 639 0 0 10593 104 10593 23 10593 1488 0 0
Province of Ontario 44998 2 30 28 60 0 44103 4958 32204 2 3 731 1 1472 32206 649 31878 101 32158 6386 18134 677
Manitoba    32457 1 8 3 12 0 32457 471 626 1 3 62 0 0 626 12 1575 4 626 178 1381 13
Province of Saskatchewan 11017 0 1 3 4 0 10996 83 1878 0 0 154 14 0 1878 35 1878 1 1878 350 1877 69
Province of Alberta 35893 0 7 25 32 2 13599 1356 13599 0 15 621 117 0 13599 130 13599 28 13599 2370 13599 794
Prairies 79367 1 16 31 48 2 57052 1910 16103 1 18 837 131 0 16103 177 17052 33 16103 2898 16857 876
British Columbia 79435 0 34 3 147 79 79408 6352 10676 2 4 990 116 130 10676 179 10672 48 10419 2250 10468 149
Yukon 3718 0 1 0 4 7 3783 161 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 399 0 0 0 0 0 363 1 44 0 0 0 0 0 44 2 44 0 362 74 44 0
Nunavut 6347 0 0 0 0 0 6340 7 11 0 0 0 0 0 11 1 11 0 11 7 11 0
Territories 10464 0 1 0 4 7 10486 169 55 0 0 0 0 0 55 3 55 0 373 81 55 0
CANADA 275995 3 83 124 323 106 245017 21053 76412 9 33 2936 260 1756 76657 1374 76619 545 70913 13884 55804 1900

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 0.20 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 2021-12-11 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 2021-12-18 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
51 2021-12-25 0.18 0.00 28.53 2.27 16.81 0.02 0.01 10.44 0.19 3.30 9.25 0.07 15.23 6.52 9.27 3.03 0.04 6.71 2.94 3.95 2.55 0.58 3.20 1.36 2.04 1.20 0.04 4.39 0.37 2.44 9.92 5.65 14.18 8.81 10.48 8.21 0.05 6.68 1.87 3.72
52 2022-01-01 0.12 0.00 33.97 3.30 20.41 0.01 0.00 12.73 0.23 4.07 6.76 0.01 17.80 6.83 10.39 2.00 0.03 5.08 2.87 3.75 1.94 0.48 2.59 1.20 1.76 1.01 0.11 3.81 0.41 2.44 7.49 6.53 14.41 6.24 9.23 10.33 0.07 6.73 2.78 4.75

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
49 219 139 69 758 252 1 849 55
50 189 163 64 684 278 2 268 62
51 165 139 66 504 255 2 410 58
52 96 94 49 339 297 1 824 38

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 16923 0.16 0.07 2042 0.05 0.05 2584 0.12 0.04 2985 0.30 0.00 4842 0.00 0.00 4200 0.33 0.24 270 0.00 0.00
48 2021-12-04 18563 0.00 0.00 3195 0.00 0.00 2471 0.00 0.00 3069 0.00 0.00 4731 0.00 0.00 4846 0.00 0.01 251 0.00 0.00
49 2021-12-11 19982 0.00 0.00 3417 0.00 0.00 2880 0.00 0.00 3420 0.00 0.00 4778 0.00 0.00 5172 0.00 0.00 315 0.00 0.00
50 2021-12-18 22550 0.00 0.00 1860 0.00 0.00 2759 0.00 0.00 3889 0.00 0.00 4879 0.00 0.00 8638 0.00 0.00 525 0.00 0.00
51 2021-12-25 28454 0.00 0.00 1238 0.00 0.00 3049 0.01 0.00 4005 0.00 0.00 5332 0.00 0.00 14257 0.00 0.00 573 0.00 0.00
52 2022-01-01 29141 0.00 0.00 1378 0.00 0.00 2560 0.00 0.00 3607 0.00 0.00 6157 0.00 0.00 13474 0.00 0.00 1965 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 16376 9.32 2884 2.67 2164 8.27 3002 14.69 3272 4.68 4806 13.82 248 4.84
49 2021-12-11 17598 10.51 2979 3.63 2519 6.95 3354 19.11 3309 6.20 5134 13.63 303 6.60
50 2021-12-18 20240 11.21 1442 8.18 2354 5.61 3813 15.53 3496 7.44 8611 13.10 524 7.25
51 2021-12-25 26048 9.25 947 6.65 2467 4.82 4004 13.71 3806 9.67 14257 8.86 567 8.47
52 2022-01-01 26999 6.76 1378 4.43 1913 3.61 3605 10.15 4477 9.49 13662 6.29 1964 2.19

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 4768 5.77 668 3.29 355 1.13 2055 3.94 960 7.60 723 13.14
49 2021-12-11 5520 3.97 684 1.02 317 0.63 2722 2.94 1063 7.34 733 7.09
50 2021-12-18 5852 3.23 677 2.51 356 1.69 3058 1.60 1020 6.18 741 7.29
51 2021-12-25 5451 3.03 311 0.64 383 3.39 3006 1.56 997 6.12 751 5.59
52 2022-01-01 4795 2.00 132 1.52 287 0.35 2687 0.86 1168 3.94 520 4.62

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 4816 1.89 668 0.75 403 4.71 2055 1.95 960 1.46 723 1.80
49 2021-12-11 5614 2.48 684 0.88 411 4.87 2722 3.23 1063 1.03 733 1.91
50 2021-12-18 5999 2.72 677 0.74 503 6.56 3058 2.88 1020 1.67 741 2.70
51 2021-12-25 5449 2.55 314 1.59 378 7.41 3006 2.20 997 1.20 751 3.73
52 2022-01-01 4834 1.94 133 3.76 324 5.56 2688 1.45 1168 1.28 520 3.27

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 4875 1.48 668 0.45 403 12.90 2055 0.44 1019 0.29 723 0.69
49 2021-12-11 5658 1.22 684 0.88 411 9.98 2721 0.55 1108 0.54 733 0.14
50 2021-12-18 5920 1.08 677 0.30 397 11.08 3057 0.46 1048 0.38 741 0.00
51 2021-12-25 5483 1.20 311 2.89 378 12.17 3006 0.13 1034 0.29 751 0.53
52 2022-01-01 4861 1.01 132 1.52 321 10.28 2687 0.33 1200 0.17 520 0.58

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 4431 16.61 668 10.93 N.A. N.A. 2053 18.56 960 15.31 708 17.23
49 2021-12-11 5206 14.56 684 11.11 N.A. N.A. 2713 14.19 1063 14.77 716 18.30
50 2021-12-18 5522 12.39 677 7.68 N.A. N.A. 3058 10.99 1020 13.24 734 20.57
51 2021-12-25 5079 9.92 311 9.00 N.A. N.A. 3006 6.99 997 12.04 733 18.55
52 2022-01-01 4525 7.49 132 11.36 N.A. N.A. 2687 5.36 1168 10.02 507 11.83

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 3792 4.96 368 4.89 465 1.94 1225 4.90 1019 8.93 708 1.41
49 2021-12-11 3830 6.58 369 5.42 356 1.97 1281 7.18 1108 11.01 715 1.54
50 2021-12-18 3815 7.29 356 6.18 496 3.02 1181 9.31 1048 10.21 734 3.27
51 2021-12-25 3106 8.21 69 10.14 378 2.91 889 11.02 1034 10.15 733 4.64
52 2022-01-01 2875 10.33 124 14.52 320 2.50 723 14.38 1200 11.42 507 5.92
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