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Respiratory Virus Report, week 42 - ending October 23, 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 42 (October 17 to October 23, 2021):

  • Respiratory syncytial virus (894 detections; 8.7% positive), enterovirus/rhinovirus (688 detections; 21.5% positive), and human parainfluenza virus (309 detections; 8.4% positive) are the most common seasonal respiratory viruses detected in Canada.
    • Activity of respiratory syncytial virus remains well above expected levels. The majority of detections are found in Quebec and Eastern Ontario.
    • Activity of enterovirus/rhinovirus is decreasing and remains near expected levels for this time of year.
    • Activity of human parainfluenza virus remains well above expected levels.
  • Detections of other respiratory viruses are low.
  • The number of tests performed for all viruses are above expected levels.
  • 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 October 23, 2021 (surveillance week 2021-42)
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 275 0 0 0 0 0 275 0 275 0 0 9 0 6 275 0 275 0 275 46 N.C. N.C.
Prince Edward Island 101 0 0 0 0 0 101 0 101 0 0 12 0 0 101 0 101 0 101 25 101 1
Nova Scotia 86 0 0 0 0 0 86 0 65 0 0 4 0 0 65 0 65 0 65 3 65 0
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 462 0 0 0 0 0 462 0 441 0 0 25 0 6 441 0 441 0 441 74 166 1
Région Nord-Est 569 0 0 0 0 0 412 123 178 0 0 1 0 0 178 2 1 0 N.C. N.C. 178 1
Québec-Chaudière-Appalaches 159 0 0 0 0 0 184 63 39 0 0 0 0 0 41 1 39 0 N.C. N.C. 39 0
Centre-du-Québec 164 0 0 0 0 0 242 125 20 0 0 0 0 0 20 0 20 0 N.C. N.C. 20 0
Montréal-Laval 587 0 0 0 0 0 587 138 216 0 0 1 0 0 216 51 216 1 N.C. N.C. 216 0
Ouest du Québec 237 0 0 0 0 0 204 94 1 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Montérégie 160 0 0 0 0 0 160 42 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 1876 0 0 0 0 0 1789 585 454 0 0 2 0 0 455 54 276 1 N.C. N.C. 453 1
P.H.O.L. - Ottawa 517 1 0 0 1 0 517 137 517 0 0 0 0 49 517 24 517 2 517 168 517 12
EORLA 199 0 0 0 0 0 199 29 20 0 0 0 0 0 20 1 0 0 20 6 0 0
P.H.O.L. - Kingston 35 0 0 0 0 0 35 1 35 0 0 0 0 10 35 1 35 0 35 9 35 0
UHN / Mount Sinai Hospital 464 0 0 0 0 0 464 0 8 0 0 0 0 0 8 0 8 0 8 0 8 0
P.H.O.L. - Toronto 321 0 0 0 0 0 321 15 321 0 0 0 0 21 321 0 321 0 321 79 321 3
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 8 0 0 0 0 0 8 0 8 0 0 0 0 0 8 0 8 0 8 1 8 0
P.H.O.L. - Timmins 4 0 0 0 0 0 4 0 4 0 0 0 0 1 4 0 4 0 4 0 4 0
St. Joseph's - London 42 0 0 0 0 0 42 2 40 0 0 0 0 9 40 3 40 0 40 5 40 0
P.H.O.L. - London 93 0 0 0 0 0 93 2 93 0 0 0 0 20 93 2 93 0 93 28 93 1
P.H.O.L. - Orillia 14 0 0 0 0 0 14 2 14 0 0 0 0 0 14 1 14 0 14 5 14 0
P.H.O.L. - Thunder Bay 2 0 0 0 0 0 2 0 2 0 0 0 0 0 2 0 2 0 2 2 2 0
P.H.O.L. - Sudbury 12 0 0 0 0 0 12 0 12 0 0 0 0 1 12 0 12 0 12 1 12 0
P.H.O.L. - Hamilton 50 0 0 0 0 0 49 0 49 0 0 0 0 6 49 0 49 0 49 15 49 0
P.H.O.L. - Peterborough 30 0 0 0 0 0 30 3 30 0 0 0 0 1 30 0 30 0 30 5 30 0
St. Joseph's - Hamilton 411 0 0 0 0 0 411 21 411 0 0 64 0 0 411 4 411 0 411 69 0 0
Province of Ontario 2202 1 0 0 1 0 2201 212 1564 0 0 64 0 118 1564 36 1544 2 1564 393 1133 16
Province of Manitoba 1579 0 0 0 0 0 1579 11 19 1 0 0 0 0 19 1 77 0 19 10 77 1
Province of Saskatchewan 831 0 0 0 0 0 831 5 67 0 0 2 0 0 67 1 67 0 67 9 67 0
Province of Alberta 1878 0 0 0 0 0 637 14 637 0 0 52 1 0 637 4 637 0 637 143 637 12
Prairies 4288 0 0 0 0 0 3047 30 723 1 0 54 1 0 723 6 781 0 723 162 781 13
British Columbia 2437 0 1 0 2 1 2437 67 484 0 0 27 1 10 484 1 484 1 468 56 468 2
Yukon 291 0 0 1 1 1 291 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C.
Northwest Territories 9 0 0 0 0 0 8 0 0 0 0 0 0 0 0 0 0 0 8 1 0 0
Nunavut 3 0 0 0 0 0 2 0 2 0 0 0 0 0 2 0 2 0 2 2 1 0
Territories 303 0 0 1 1 1 301 0 2 0 0 0 0 0 2 0 2 0 10 3 1 0
CANADA 11568 1 1 1 4 2 10237 894 3668 1 0 172 2 134 3669 97 3528 4 3206 688 3002 33

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

Results from British Columbia 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 British Columbia, 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 October 23, 2021 (surveillance weeks 2021-35 to 2021-42)
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 4433 0 0 0 0 0 4433 8 4433 0 3 54 0 47 4436 12 4433 1 4433 1402 N.C. N.C.
Prince Edward Island 647 0 0 0 0 0 647 0 647 0 0 125 0 0 647 10 647 0 647 198 647 7
Nova Scotia 512 0 0 0 0 0 512 3 401 0 2 23 0 0 401 3 401 0 401 44 401 0
New Brunswick 785 0 0 0 0 0 738 2 588 0 0 15 0 0 581 0 588 0 588 14 497 0
Atlantic 6377 0 0 0 0 0 6330 13 6069 0 5 217 0 47 6065 25 6069 1 6069 1658 1545 7
Région Nord-Est 3683 0 0 0 0 0 1800 695 292 0 0 4 0 0 292 9 9 0 N.C. N.C. 292 2
Québec-Chaudière-Appalaches 534 0 0 0 0 2 971 416 211 0 0 4 0 0 209 6 131 0 N.C. N.C. 133 0
Centre-du-Québec 744 0 0 0 0 0 1050 550 167 0 0 9 0 0 167 4 167 0 N.C. N.C. 160 0
Montréal-Laval 5068 0 0 1 1 3 5073 1907 1309 1 0 10 0 0 1309 84 1309 18 N.C. N.C. 1309 3
Ouest du Québec 1068 0 0 0 0 0 1036 469 4 0 0 0 0 0 0 0 3 0 N.C. N.C. 3 0
Montérégie 650 0 0 0 0 0 650 267 0 0 0 0 0 0 0 0 0 0 N.C. N.C. 0 0
Province of Québec 11747 0 0 1 1 5 10580 4304 1983 1 0 27 0 0 1977 103 1619 18 N.C. N.C. 1897 5
P.H.O.L. - Ottawa 3064 1 1 0 2 0 3064 630 3064 0 0 0 0 402 3064 107 3063 13 3064 1255 3063 52
EORLA 1016 0 0 0 0 0 991 113 201 0 0 6 0 0 201 1 1 0 201 45 25 1
P.H.O.L. - Kingston 365 0 0 0 0 0 365 10 364 0 0 0 0 94 364 6 363 1 364 144 363 7
UHN / Mount Sinai Hospital 3276 0 0 1 1 0 3276 6 123 0 0 0 0 0 123 0 123 0 123 5 123 0
P.H.O.L. - Toronto 1854 0 1 0 1 0 1853 35 1853 0 0 0 0 128 1854 11 1853 2 1853 356 1854 14
Sick Kids Hospital - Toronto 222 0 0 0 0 0 0 0 222 0 0 17 0 0 222 1 222 1 222 59 222 0
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 26 0 0 0 0 0 26 0 26 0 0 0 0 0 26 0 26 0 26 8 26 0
P.H.O.L. - Timmins 55 0 0 0 0 0 55 2 55 0 0 0 0 4 55 0 55 0 55 9 55 0
St. Joseph's - London 276 0 0 0 0 0 276 9 273 0 0 7 0 38 273 8 273 1 277 60 276 0
P.H.O.L. - London 439 0 0 0 0 0 439 5 439 0 0 0 0 63 439 5 439 0 439 131 439 1
P.H.O.L. - Orillia 106 0 0 0 0 0 106 3 106 0 0 0 0 13 106 2 104 1 106 39 104 0
P.H.O.L. - Thunder Bay 58 0 0 0 0 0 58 0 58 0 0 0 0 0 58 0 58 0 58 29 58 0
P.H.O.L. - Sudbury 118 0 0 0 0 0 118 0 118 0 0 0 0 2 118 0 118 0 118 22 118 0
P.H.O.L. - Hamilton 242 0 1 0 1 0 239 1 239 0 0 0 0 21 239 2 239 4 239 75 239 0
P.H.O.L. - Peterborough 130 0 0 0 0 0 130 6 130 0 0 0 0 5 130 1 129 0 130 27 129 0
St. Joseph's - Hamilton 2581 0 0 0 0 0 2575 76 2575 0 0 379 0 0 2575 13 2575 3 2575 545 0 0
Province of Ontario 13828 1 3 1 5 0 13571 896 9846 0 0 409 0 770 9847 157 9641 26 9850 2809 7094 75
Manitoba 12471 1 0 1 2 0 12471 37 206 1 0 8 0 0 206 4 641 2 206 89 641 2
Province of Saskatchewan 1978 0 0 0 0 0 1950 8 628 0 0 15 2 0 628 9 628 0 628 143 627 0
Province of Alberta 14084 0 1 2 3 0 5503 60 5503 0 3 221 19 0 5503 37 5503 1 5503 1119 5503 78
Prairies 28533 1 1 3 5 0 19924 105 6337 1 3 244 21 0 6337 50 6772 3 6337 1351 6771 80
British Columbia 11906 0 1 2 4 1 11906 185 3561 0 0 208 19 27 3561 28 3557 9 3497 798 3493 11
Yukon 1745 0 0 1 1 1 1817 3 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 144 0 0 0 0 0 133 0 24 0 0 0 0 0 24 2 24 0 132 21 24 0
Nunavut 8 0 0 0 0 0 6 0 6 0 0 0 0 0 6 0 6 0 6 4 5 0
Territories 1897 0 0 1 1 1 1956 3 30 0 0 0 0 0 30 2 30 0 138 25 29 0
CANADA 74288 2 5 8 16 7 64267 5506 27826 2 8 1105 40 844 27817 365 27688 57 25891 6641 20829 178

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.

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

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

Results from British Columbia 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 British Columbia, 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 10.40 0.10 1.74 0.58 0.98 10.30 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 22.68 15.48 33.62 26.94 29.81 1.69 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 8.73 0.07 2.11 0.63 1.14 8.42 0.06 3.89 2.64 3.20 2.64 0.47 2.38 1.47 1.86 0.11 0.06 0.89 0.15 0.38 21.46 13.60 32.62 24.54 27.82 1.10 0.00 1.18 0.20 0.49

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 7 722 48 932 6
42 309 97 4 688 33 894 6

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 10019 0.03 0.03 614 0.00 0.00 1704 0.00 0.18 1893 0.05 0.00 3628 0.03 0.00 1903 0.05 0.00 277 0.00 0.00
42 2021-10-23 11568 0.03 0.02 462 0.00 0.00 1876 0.00 0.00 2202 0.05 0.00 4288 0.00 0.00 2437 0.08 0.04 303 0.33 0.33

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 8963 10.40 608 0.16 1676 42.78 1867 8.36 2633 0.72 1903 2.00 276 0.36
42 2021-10-23 10237 8.73 462 0.00 1789 32.70 2201 9.63 3047 0.98 2437 2.75 301 0.00

Positive human parainfluenza virus (HPIV) tests

Figure 5: Positive human parainfluenza virus (HPIV) tests (%) in Canada by region by surveillance week
Figure 5
Figure 5: Positive human parainfluenza virus (HPIV) tests (%) in Canada by region by surveillance week
Week Week End Can Tests HPIV% Atl Tests HPIV% QC Tests HPIV% ON Tests HPIV% Pr Tests HPIV% BC Tests HPIV%
35 2021-09-04 2637 5.99 580 1.38 138 5.07 857 14.47 739 1.89 315 1.59
36 2021-09-11 2884 4.92 653 2.91 149 4.03 805 11.55 955 1.57 317 2.84
37 2021-09-18 3465 5.97 978 3.89 139 0.72 1099 10.74 857 3.03 386 6.22
38 2021-09-25 3783 4.73 1083 3.69 222 0.45 1113 8.18 857 2.33 506 5.34
39 2021-10-02 4050 8.12 1070 4.86 232 1.72 1461 13.07 765 5.88 517 7.16
40 2021-10-09 3822 8.19 721 6.38 314 1.27 1542 12.39 717 5.58 524 6.11
41 2021-10-16 3515 10.30 543 6.45 335 0.90 1404 13.46 723 7.33 510 16.08
42 2021-10-23 3668 8.42 441 7.03 454 0.44 1564 11.64 723 7.75 484 7.85

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 3515 1.39 543 0.18 335 5.07 1404 1.64 723 0.97 510 0.20
42 2021-10-23 3669 2.64 441 0.00 455 11.87 1564 2.30 723 0.83 484 0.21

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 3436 0.20 543 0.18 229 0.87 1379 0.07 775 0.00 510 0.59
42 2021-10-23 3528 0.11 441 0.00 276 0.36 1544 0.13 781 0.00 484 0.21

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 3184 22.68 543 16.21 N.A. N.A. 1404 26.85 723 15.21 502 28.88
42 2021-10-23 3206 21.46 441 16.78 N.A. N.A. 1564 25.13 723 22.41 468 11.97

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 2837 1.69 250 1.60 335 0.90 975 1.64 775 2.71 502 0.80
42 2021-10-23 3002 1.10 166 0.60 453 0.22 1133 1.41 781 1.66 468 0.43

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