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Respiratory Virus Report, Week 44 - ending November 4, 2023

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Organization: Public Health Agency of Canada

Please note that the Respiratory Virus Detection Surveillance System (RVDSS) is a sentinel laboratory surveillance system that does not capture all respiratory virus testing performed in Canada; differences may exist between the data presented in this report and provincial/territorial epidemiological reports. SARS-CoV-2 laboratory data is included in this report to facilitate the comparison of positivity with other respiratory viruses. Interpretation should be made with caution as testing practices differ among viruses.

For additional SARS-CoV-2 surveillance information, please refer to the COVID-19 epidemiology update.

Overall summary

In week 44 (week ending November 4, 2023) in Canada, participating RVDSS laboratories reported 6,712 detections of SARS-CoV-2 from 37,956 tests (17.7% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 7,353 to 24,183 tests), activity of RSV is low but increasing.

  • Over the past four surveillance weeks, national SARS-CoV-2 percent positivity has remained stable.
  • Activity of RSV is increasing and slightly above expected levels for this time of year (924 detections; 4.1% positive) but overall remains low. RSV activity is expected to increase at this time of year.
  • Influenza is showing early signs of increasing activity, but is within expected levels for this time of year as overall activity remains low and below seasonal threshold levels (544 detections; 2.3% positive). Influenza activity is expected to increase at this time of year.
  • Activity of all other non-SARS-CoV-2 respiratory viruses is low and near expected levels typical of this time of year.
  • 35/35 sentinel laboratories reported surveillance data

On this page

Abbreviations:
ADV
Adenovirus
Atl
Atlantic Canada
BC
British Columbia
Can
Canada
EORLA
Eastern Ontario Regional Laboratory Association
EV/RV
Enterovirus/Rhinovirus
Flu
Influenza
Flu A(H1)pdm09
Influenza A(H1N1)pdm09
Flu A(H3)
Influenza A(H3N2)
Flu A(UnS)
Influenza A(Unsubtyped)
HCoV
Human coronavirus 229E/OC43/NL63/HKU1
HMPV
Human metapneumovirus
HPIV
Human parainfluenza virus
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
RSV
Respiratory syncytial virus
RVDSS
Respiratory Virus Detection Surveillance System
SARS-CoV-2
Severe acute respiratory syndrome coronavirus 2
Terr
Territories of Canada
UHN
University Health Network

Respiratory virus detections

Table 1: Respiratory virus detections for the week ending November 4, 2023 (surveillance week 2023-44)
Reporting Laboratory SARS-CoV-2 Tested SARS-CoV-2 Positive 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 544 93 351 0 0 15 15 0 351 3 351 1 2 1 1 0 351 7 351 1 351 38 351 1
Prince Edward Island 175 26 74 0 0 0 0 0 74 1 16 0 0 0 1 0 16 0 16 0 16 5 0 0
Nova Scotia 1328 290 660 0 0 6 6 1 660 21 37 1 0 0 2 0 37 2 37 0 37 10 37 0
New Brunswick 918 122 829 2 1 0 3 0 819 16 88 0 0 0 2 0 88 1 88 0 88 31 88 0
Atlantic 2965 531 1914 2 1 21 24 1 1904 41 492 2 2 1 6 0 492 10 492 1 492 84 476 1
Région Nord-Est 1737 387 1239 0 0 0 0 0 472 14 58 1 1 0 1 0 58 4 57 2 N.C. N.C. 58 0
Québec-Chaudière-Appalaches 2032 309 687 0 0 0 0 1 692 54 273 1 0 0 0 0 291 17 273 7 N.C. N.C. 273 0
Centre-du-Québec 2152 429 509 0 0 3 3 0 507 39 38 2 1 2 0 0 38 2 38 0 N.C. N.C. 38 0
Montréal-Laval 2636 361 1322 0 0 9 9 1 1159 96 651 5 3 4 1 0 651 17 655 10 N.C. N.C. 651 3
Ouest du Québec 1629 383 633 0 0 5 5 0 630 42 25 0 0 0 0 0 25 1 25 0 N.C. N.C. 25 0
Montérégie 1617 295 912 0 0 18 18 2 878 48 4 0 0 0 0 0 4 1 4 0 N.C. N.C. 4 0
Province of Québec 11803 2164 5302 0 0 35 35 4 4338 293 1049 9 5 6 2 0 1067 42 1052 19 N.C. N.C. 1049 3
P.H.O.L. - Ottawa 348 119 221 0 0 0 0 0 221 6 132 0 0 0 0 1 132 0 132 0 132 22 132 10
EORLA 1483 170 564 0 0 1 1 0 564 75 36 0 0 0 0 0 36 0 36 0 36 8 36 0
P.H.O.L. - Kingston 193 83 101 0 0 0 0 0 101 5 72 0 0 0 0 1 72 2 72 0 72 10 72 0
UHN / Mount Sinai Hospital 1020 79 640 0 0 1 1 1 640 9 24 0 0 0 0 0 24 0 24 0 24 0 24 0
P.H.O.L. - Toronto 515 202 994 6 3 0 6 1 994 32 895 0 0 0 0 21 895 11 895 6 895 91 895 1
Sick Kids Hospital - Toronto 160 14 115 0 1 1 2 0 115 23 115 1 0 1 1 0 115 5 115 0 115 38 115 0
Shared Hospital Laboratory 1443 145 1443 13 2 2 17 0 1444 78 1447 0 0 0 0 5 1447 13 1450 0 1450 56 1425 3
P.H.O.L. - Sault Ste. Marie 28 20 9 0 0 0 0 0 9 0 8 0 0 0 0 0 8 0 8 0 8 1 8 0
P.H.O.L. - Timmins 55 31 43 0 0 0 0 0 43 0 28 0 0 0 0 1 28 1 28 0 28 5 28 0
St. Joseph's - London 817 131 329 0 0 2 2 1 329 10 109 0 0 0 0 0 109 0 109 1 109 15 109 1
P.H.O.L. - London 485 192 365 3 1 0 0 0 365 22 293 0 0 0 0 9 293 2 293 0 293 33 293 0
P.H.O.L. - Orillia 19 4 61 1 0 0 1 0 61 8 61 0 0 0 0 2 61 3 61 0 61 11 61 0
P.H.O.L. - Thunder Bay 47 22 20 0 0 0 0 0 20 0 14 0 0 0 0 0 14 0 14 0 14 2 14 0
P.H.O.L. - Sudbury 63 39 39 0 0 0 0 0 39 0 14 0 0 0 0 1 14 0 14 0 14 1 14 0
P.H.O.L. - Hamilton 197 59 169 1 0 0 0 0 169 6 131 0 0 0 0 1 131 3 131 1 131 14 131 0
P.H.O.L. - Peterborough 58 33 67 0 0 0 0 0 67 16 54 0 0 0 0 0 54 1 54 0 54 7 54 0
St. Joseph's - Hamilton 1902 177 1685 0 0 7 7 1 1685 114 1685 0 0 5 0 0 1685 12 1685 1 1685 114 0 0
Sault Area Hospital 229 28 133 1 0 0 1 0 133 2 96 0 0 0 2 0 96 1 96 0 96 10 96 0
Province of Ontario 9062 1548 6998 25 7 14 38 4 6999 406 5214 1 0 6 3 42 5214 54 5217 9 5217 438 3507 15
Manitoba 1635 355 1308 0 1 6 7 0 1308 7 97 0 0 0 5 0 97 8 126 0 97 21 126 0
Saskatchewan 2824 460 1139 0 0 164 164 2 1069 14 422 0 0 0 0 0 422 12 422 11 422 42 422 1
Alberta 5825 1044 3920 141 20 5 166 6 3602 79 1128 10 2 5 0 0 1128 14 0 0 1118 128 1128 3
Prairies 10284 1859 6367 141 21 175 337 8 5979 100 1647 10 2 5 5 0 1647 34 548 11 1637 191 1676 4
British Columbia 3648 580 3458 29 5 3 86 4 3458 80 693 5 8 1 12 0 693 18 693 8 645 134 645 6
Yukon 59 13 42 0 0 0 0 0 42 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.
Northwest Territories 24 2 23 2 0 0 2 0 23 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 23 1 N.C. N.C.
Nunavut 111 15 79 0 1 0 1 0 79 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.
Territories 194 30 144 2 1 0 3 0 144 4 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 23 1 N.C. N.C.
CANADA 37956 6712 24183 199 35 248 523 21 22822 924 9095 27 17 19 28 42 9113 158 8002 48 8014 848 7353 29

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.

Some specimens from Yukon (YT) are sent to reference laboratories in British Columbia and reported results reflect specimens identified as originating from YT.

Results from British Columbia comprise of specimens from the following sites: Children's and Women's Hospital Laboratory, Fraser Health Medical Microbiology Laboratory, Island Health, Providence Health Care, Vancouver Coastal Health sites, Victoria General Hospital, BCCDC Public Health Laboratory, Interior Health Authority sites and Northern Health Authority sites.

Due to different testing protocols of laboratories across Canada, influenza A subtype detection counts may not be included in total influenza A detection counts. Total influenza A and B positive counts are used to calculate percentage of tests positive.

Delays in the reporting of data may cause data to change retrospectively.

Table 2: Cumulative respiratory virus detections from August 27, 2023 to November 4, 2023 (surveillance weeks 2023-35 to 2023-44)
Reporting Laboratory SARS-CoV-2 Tested SARS-CoV-2 Positive 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 5089 911 3291 0 0 28 28 0 3291 25 3291 3 8 6 34 0 3291 45 3291 10 3291 627 3291 9
Prince Edward Island 1845 226 409 0 0 2 2 0 409 3 91 0 0 0 3 0 90 4 80 0 90 43 74 0
Nova Scotia 14147 3508 5733 0 0 30 30 2 5733 73 364 14 1 1 6 0 364 19 357 1 364 122 363 0
New Brunswick 8523 1258 6240 12 1 5 18 1 6134 48 625 6 2 0 7 0 625 11 625 0 625 185 625 1
Atlantic 29604 5903 15673 12 1 65 78 3 15567 149 4371 23 11 7 50 0 4370 79 4353 11 4370 977 4353 10
Région Nord-Est 16240 3053 11345 0 0 16 16 1 2794 71 592 10 5 2 14 0 592 20 587 12 N.C. N.C. 592 0
Québec-Chaudière-Appalaches 21874 3877 5599 0 0 18 18 4 5604 216 2427 9 2 1 8 0 2558 119 2427 33 N.C. N.C. 2427 2
Centre-du-Québec 21765 4510 3941 0 0 15 15 4 3927 153 309 11 5 4 3 0 309 16 309 4 N.C. N.C. 309 1
Montréal-Laval 31621 5092 12785 0 0 57 57 5 11489 440 6845 63 23 30 18 0 6845 126 6863 70 N.C. N.C. 6845 47
Ouest du Québec 17919 4397 5118 1 0 25 26 6 5108 184 197 7 3 1 4 0 197 13 197 3 N.C. N.C. 197 1
Montérégie 15395 3019 8057 0 0 42 42 9 7495 225 61 1 0 0 1 0 61 1 61 0 N.C. N.C. 61 0
Province of Québec 124814 23948 46845 1 0 173 174 29 36417 1289 10431 101 38 38 48 0 10562 295 10444 122 N.C. N.C. 10431 51
P.H.O.L. - Ottawa 3962 1456 2276 10 0 1 11 0 2276 16 1358 0 0 0 0 20 1358 0 1358 1 1358 264 1358 16
EORLA 12538 1398 4385 0 0 15 15 4 4385 342 310 0 3 2 1 0 285 1 310 1 310 81 310 1
P.H.O.L. - Kingston 2703 802 1267 1 0 0 0 0 1267 9 957 0 0 0 0 24 957 4 957 0 957 205 957 1
UHN / Mount Sinai Hospital 9856 796 5650 0 0 10 10 7 5650 28 222 0 0 4 0 0 222 1 222 0 222 13 222 0
P.H.O.L. - Toronto 5927 2009 9212 67 25 2 67 1 9212 103 8309 0 0 0 0 243 8310 82 8306 41 8309 1679 8306 21
Sick Kids Hospital - Toronto 1130 76 966 9 8 7 24 1 966 86 966 10 4 6 5 0 966 28 966 6 966 176 966 4
Shared Hospital Laboratory 11896 1166 11896 28 17 2 47 2 11898 344 11903 0 0 0 0 81 11901 88 11897 11 11924 768 11899 18
P.H.O.L. - Sault Ste. Marie 153 117 129 0 0 0 0 0 129 0 71 0 0 0 0 1 71 0 71 0 71 13 71 0
P.H.O.L. - Timmins 330 104 263 0 0 0 0 0 263 3 214 0 0 0 0 11 214 3 214 0 214 28 214 0
St. Joseph's - London 7978 1166 1128 0 0 3 3 1 1128 42 885 0 0 0 0 9 902 6 902 1 902 133 902 3
P.H.O.L. - London 4900 1618 3250 3 4 0 3 1 3250 47 2577 0 0 0 0 60 2577 13 2577 0 2577 437 2577 0
P.H.O.L. - Orillia 191 30 423 2 1 0 3 0 422 18 409 0 0 0 0 11 409 11 409 2 409 105 409 0
P.H.O.L. - Thunder Bay 623 250 327 0 0 0 0 0 327 0 247 0 0 0 0 5 247 1 247 1 247 37 247 1
P.H.O.L. - Sudbury 213 98 209 0 0 0 0 0 207 0 146 0 0 0 0 2 147 1 146 0 146 33 146 0
P.H.O.L. - Hamilton 2505 779 1931 5 1 0 2 1 1931 32 1383 0 0 0 0 41 1383 17 1383 13 1383 311 1383 1
P.H.O.L. - Peterborough 698 239 673 0 0 1 1 1 673 71 591 0 0 0 0 16 591 9 591 1 591 153 591 2
St. Joseph's - Hamilton 16814 1800 14281 0 0 36 36 12 14281 379 14281 0 0 40 0 0 14281 82 14281 33 14281 1319 0 0
Sault Area Hospital 1307 158 881 1 1 0 2 0 874 4 675 0 0 2 2 0 675 7 675 0 675 115 685 0
Province of Ontario 83724 14062 59147 126 57 77 224 31 59139 1524 45504 10 7 54 8 524 45496 354 45512 111 45542 5870 31243 68
Manitoba 14884 2622 11547 0 2 32 34 5 11547 42 701 0 5 4 26 0 701 41 1097 2 701 277 1097 3
Saskatchewan 19119 2584 8256 0 0 233 233 6 7987 49 3270 6 5 1 6 0 3270 95 3265 31 3255 640 3270 8
Alberta 49264 7643 33703 404 69 14 487 38 31287 241 10536 44 33 15 3 0 10534 118 5237 0 10338 1622 10535 49
Prairies 83267 12849 53506 404 71 279 754 49 50821 332 14507 50 43 20 35 0 14505 254 9599 33 14294 2539 14902 60
British Columbia 34575 6594 31306 283 51 17 469 19 31289 304 7063 35 29 17 70 0 7063 171 7063 64 6708 1462 6685 27
Yukon 567 77 326 0 1 0 2 0 326 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.
Northwest Territories 201 29 162 3 0 0 3 0 162 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 162 47 N.C. N.C.
Nunavut 949 144 615 0 1 0 1 0 615 4 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 1717 250 1103 3 2 0 6 0 1103 5 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 162 47 N.C. N.C.
CANADA 357701 63606 207580 829 182 611 1705 131 194336 3603 81876 219 128 136 211 524 81996 1153 76971 341 71076 10895 67614 216

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.

Some specimens from Yukon (YT) are sent to reference laboratories in British Columbia and reported results reflect specimens identified as originating from YT.

Results from British Columbia comprise of specimens from the following sites: Children's and Women's Hospital Laboratory, Fraser Health Medical Microbiology Laboratory, Island Health, Providence Health Care, Vancouver Coastal Health sites, Victoria General Hospital, BCCDC Public Health Laboratory, Interior Health Authority sites and Northern Health Authority sites.

Due to different testing protocols of laboratories across Canada, influenza A subtype detection counts may not be included in total influenza A detection counts. Total influenza A and B positive counts are used to calculate percentage of tests positive.

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.

Positive respiratory virus tests historical comparison

Figure 1: Positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), influenza, and respiratory syncytial 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: Changes to testing practices during the COVID-19 pandemic may cause substantial changes to indicator estimates from previous years. Collection of laboratory testing practice meta-data to understand these changes is ongoing. Interpret trends with caution.

Note: SARS-CoV-2 surveillance was integrated into RVDSS at the beginning of the 2022-2023 season; no prior data is available for historical comparison.

Note: Data from week 11 of the 2019-2020 season onwards are excluded from the historical comparison due to the COVID-19 pandemic.

Figure 1: Positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), influenza, and respiratory syncytial 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 2023-2024 SARS-CoV-2% 2022-2023 SARS-CoV-2% 2023-2024 A% 2022-2023 A% 2021-2022 A% Max A% Base Min A% Base Av A% Base 2023-2024 B% 2022-2023 B% 2021-2022 B% Max B% Base Min B% Base Av B% Base 2023-2024 RSV% 2022-2023 RSV% 2021-2022 RSV% Max RSV% Base Min RSV% Base Av RSV% Base
35 2023-09-02 14.42 13.40 0.69 0.18 0.04 1.60 0.11 0.67 0.06 0.02 0.00 0.28 0.00 0.14 0.58 1.12 4.43 1.34 0.38 0.61
36 2023-09-09 15.88 13.07 0.43 0.14 0.01 2.11 0.23 0.99 0.06 0.04 0.00 0.55 0.00 0.15 0.71 1.12 6.61 1.09 0.22 0.62
37 2023-09-16 16.47 12.74 0.48 0.23 0.03 1.59 0.35 0.87 0.03 0.01 0.00 0.19 0.04 0.12 0.81 1.06 7.59 1.37 0.38 0.65
38 2023-09-23 18.61 13.62 0.51 0.48 0.00 2.15 0.43 1.17 0.02 0.02 0.00 0.21 0.00 0.14 1.15 1.47 7.16 1.24 0.37 0.67
39 2023-09-30 19.60 14.44 0.52 0.67 0.01 2.65 0.50 1.52 0.09 0.03 0.00 0.29 0.09 0.18 1.14 2.14 8.48 1.29 0.51 0.72
40 2023-10-07 19.81 15.06 0.63 0.96 0.00 2.17 1.01 1.58 0.04 0.03 0.02 0.20 0.05 0.11 1.39 2.54 8.53 1.39 0.34 0.71
41 2023-10-14 17.55 16.59 0.51 1.42 0.03 2.66 1.05 1.56 0.03 0.01 0.03 0.36 0.03 0.16 1.80 3.65 9.54 1.74 0.58 1.03
42 2023-10-21 17.78 15.39 0.73 2.36 0.03 2.96 0.77 1.92 0.08 0.05 0.02 0.45 0.05 0.25 2.38 4.63 8.18 2.11 0.63 1.25
43 2023-10-28 17.89 15.78 1.17 5.47 0.03 5.19 0.68 2.59 0.10 0.03 0.02 0.55 0.06 0.23 3.20 6.76 8.11 2.16 0.55 1.41
44 2023-11-04 17.68 13.91 2.16 10.75 0.10 8.32 1.08 3.35 0.09 0.03 0.10 0.71 0.12 0.31 4.05 7.77 7.82 3.35 0.83 2.07
Figure 2: Positive tests (%) of other respiratory viruses reported by participating laboratories in Canada by surveillance week compared to average and range from 2014-2015 to 2019-2020 season
Figure 2

Shaded area represents the maximum and minimum % of respiratory virus tests positive reported by week from seasons 2014-2015 to 2019-2020

Note: Changes to testing practices during the COVID-19 pandemic may cause substantial changes to indicator estimates from previous years. Collection of laboratory testing practice meta-data to understand these changes is ongoing. Interpret trends with caution.

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

Figure 2: Positive tests (%) of other respiratory viruses reported by participating laboratories in Canada by surveillance week compared to average and range from 2014-2015 to 2019-2020 season
Week Week end 2023-2024 EV/RV% 2022-2023 EV/RV% 2021-2022 EV/RV% Max EV/RV% Base Min EV/RV% Base Av EV/RV% Base 2023-2024 HPIV% 2022-2023 HPIV% 2021-2022 HPIV% Max HPIV% Base Min HPIV% Base Av HPIV% Base 2023-2024 ADV% 2022-2023 ADV% 2021-2022 ADV% Max ADV% Base Min ADV% Base Av ADV% Base 2023-2024 HMPV% 2022-2023 HMPV% 2021-2022 HMPV% Max HMPV% Base Min HMPV% Base Av HMPV% Base 2023-2024 HCoV% 2022-2023 HCoV% 2021-2022 HCoV% Max HCoV% Base Min HCoV% Base Av HCoV% Base
35 2023-09-02 12.52 15.47 21.96 27.19 22.44 24.71 2.00 2.80 5.99 3.16 1.15 2.44 1.61 2.28 1.18 1.74 0.99 1.43 0.33 1.80 0.23 2.04 0.10 0.78 0.30 0.53 1.05 0.76 0.18 0.45
36 2023-09-09 14.84 16.22 18.59 30.69 23.30 26.31 1.49 3.21 4.93 3.31 1.35 2.32 1.50 2.18 1.15 2.85 1.42 1.87 0.38 1.81 0.24 0.84 0.10 0.48 0.42 0.38 0.62 0.38 0.12 0.22
37 2023-09-16 18.29 21.73 27.46 33.58 27.74 31.69 1.61 3.02 5.97 3.26 1.65 2.40 1.47 2.10 0.81 2.44 1.38 1.86 0.38 1.38 0.17 1.61 0.00 0.51 0.23 0.28 0.44 0.56 0.00 0.26
38 2023-09-23 19.99 23.50 33.19 39.57 32.80 35.83 1.76 2.42 4.73 2.87 1.92 2.33 0.93 1.58 0.82 2.04 1.11 1.63 0.38 1.61 0.37 1.43 0.06 0.48 0.45 0.32 0.67 1.36 0.06 0.43
39 2023-09-30 18.56 22.89 30.01 40.59 34.87 37.68 1.32 3.09 8.12 3.01 1.70 2.24 1.15 2.21 1.14 2.27 1.04 1.66 0.51 1.43 0.17 0.72 0.05 0.29 0.27 0.59 0.62 0.66 0.07 0.45
40 2023-10-07 17.65 19.32 26.26 41.29 33.00 35.43 1.40 3.69 8.19 3.28 1.90 2.43 1.36 1.79 1.31 2.25 1.39 1.82 0.32 1.49 0.16 0.92 0.05 0.34 0.27 0.93 0.57 1.08 0.22 0.59
41 2023-10-14 15.74 16.70 22.91 33.62 26.94 29.93 1.28 3.52 10.46 3.70 1.96 2.75 1.38 2.03 1.37 1.91 1.28 1.70 0.42 1.66 0.20 0.95 0.04 0.46 0.32 0.99 1.69 0.70 0.00 0.34
42 2023-10-21 13.12 12.95 22.16 32.62 24.54 27.86 1.59 4.22 10.01 3.89 2.64 3.21 1.43 1.65 2.54 2.39 1.47 1.86 0.52 1.58 0.15 0.89 0.15 0.40 0.17 1.16 1.07 1.18 0.20 0.49
43 2023-10-28 12.53 11.05 19.64 28.73 21.67 24.95 1.20 4.41 9.38 3.98 3.18 3.54 1.49 1.79 1.15 2.42 1.63 1.96 0.52 1.79 0.36 1.64 0.12 0.58 0.38 1.86 1.05 2.35 0.27 0.75
44 2023-11-04 10.58 10.23 21.45 23.82 16.75 21.38 1.46 4.14 10.28 4.81 2.94 3.72 1.73 2.02 1.42 2.88 1.18 2.21 0.60 1.79 0.77 1.08 0.23 0.48 0.39 2.54 2.21 2.59 0.21 0.88

Positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) tests

Figure 3: Positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) tests (%) in Canada by region by surveillance week
Figure 3

Note: Differences in positivity between jurisdictions can reflect differences in testing practices. Please interpret with caution.

Figure 3: Positive severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) tests (%) in Canada by region by surveillance week
Week Week end Can Tests SARS-CoV-2% Atl Tests SARS-CoV-2% QC Tests SARS-CoV-2% ON Tests SARS-CoV-2% Pr Tests SARS-CoV-2% BC Tests SARS-CoV-2% Terr Tests SARS-CoV-2%
35 2023-09-02 25622 14.42 2110 16.92 9351 16.30 6230 12.39 5158 10.66 2651 18.03 122 11.48
36 2023-09-09 28248 15.88 2346 20.20 10215 17.37 6939 15.46 5979 11.76 2640 16.70 129 17.05
37 2023-09-16 31751 16.47 2567 18.62 11678 18.11 7337 15.66 6909 12.03 3111 20.64 149 10.07
38 2023-09-23 36263 18.61 2775 18.38 13455 20.48 8514 18.38 7968 14.23 3377 22.59 174 12.64
39 2023-09-30 40587 19.60 3126 22.65 15431 21.30 9291 17.86 8658 15.65 3895 23.59 186 13.98
40 2023-10-07 42171 19.81 3544 24.41 15684 22.19 9349 17.61 9196 15.96 4202 20.75 196 12.24
41 2023-10-14 38464 17.56 3583 20.74 12606 18.30 8426 15.27 9624 16.78 4048 19.12 177 15.25
42 2023-10-21 39259 17.77 3493 19.70 12588 18.62 9300 16.86 9954 17.15 3734 16.95 190 18.42
41 2023-10-14 38462 17.55 3583 20.74 12605 18.30 8426 15.27 9624 16.77 4047 19.13 177 15.25
42 2023-10-21 39350 17.78 3493 19.70 12590 18.63 9300 16.86 10040 17.16 3737 17.13 190 17.89
43 2023-10-28 37290 17.89 3095 17.74 12002 18.29 9276 19.35 9450 17.06 3267 14.85 200 18.00
44 2023-11-04 37956 17.68 2965 17.91 11803 18.33 9062 17.08 10284 18.08 3648 15.90 194 15.46

Positive influenza (Flu) tests

Figure 4: Positive influenza (Flu) tests (%) in Canada by region by surveillance week
Figure 4
Figure 4: 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 2023-09-02 14536 0.69 0.06 984 0.00 0.00 3339 0.24 0.15 4324 0.39 0.09 3647 0.58 0.00 2158 2.46 0.00 84 2.38 0.00
36 2023-09-09 15421 0.43 0.06 1047 0.00 0.00 3649 0.19 0.03 4455 0.31 0.09 4060 0.37 0.05 2117 1.46 0.09 93 0.00 0.00
37 2023-09-16 18030 0.48 0.03 1216 0.08 0.00 4174 0.41 0.07 5145 0.29 0.00 4700 0.38 0.04 2703 1.29 0.04 92 0.00 0.00
38 2023-09-23 20116 0.51 0.02 1388 0.07 0.00 4734 0.30 0.00 5652 0.21 0.05 5320 0.62 0.02 2928 1.47 0.00 94 0.00 0.00
39 2023-09-30 21513 0.52 0.09 1403 0.14 0.07 4847 0.21 0.08 6186 0.37 0.11 5354 0.50 0.11 3598 1.36 0.06 125 0.00 0.00
40 2023-10-07 22988 0.63 0.04 1775 0.34 0.00 5628 0.37 0.04 6456 0.31 0.00 5133 0.70 0.12 3878 1.60 0.05 118 0.00 0.00
41 2023-10-14 23191 0.51 0.03 1938 0.57 0.00 4978 0.22 0.06 6283 0.30 0.00 6050 0.81 0.05 3828 0.73 0.03 114 0.00 0.00
42 2023-10-21 24054 0.73 0.08 2029 0.69 0.05 5110 0.37 0.02 6834 0.47 0.07 6357 1.13 0.13 3599 1.06 0.11 125 0.00 0.00
43 2023-10-28 22873 1.17 0.10 1979 0.96 0.00 5084 0.63 0.12 6814 0.50 0.06 5843 2.36 0.17 3039 1.45 0.10 114 0.88 0.00
44 2023-11-04 24183 2.16 0.09 1914 1.25 0.05 5302 0.66 0.08 6998 0.54 0.06 6367 5.29 0.13 3458 2.49 0.12 144 2.08 0.00

Positive respiratory syncytial virus (RSV) tests

Figure 5: Positive respiratory syncytial virus (RSV) tests (%) in Canada by region by surveillance week
Figure 5
Figure 5: Positive respiratory syncytial virus (RSV) tests (%) in Canada by region by surveillance week
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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 2023-09-02 13603 0.58 969 0.00 2540 1.14 4324 0.81 3528 0.20 2158 0.32 84 1.19
36 2023-09-09 14352 0.71 1047 0.57 2750 1.64 4455 0.88 3906 0.18 2101 0.24 93 0.00
37 2023-09-16 16803 0.81 1201 0.25 3181 1.67 5138 1.01 4489 0.38 2702 0.41 92 0.00
38 2023-09-23 18777 1.15 1381 1.30 3652 2.27 5652 1.43 5070 0.37 2928 0.51 94 0.00
39 2023-09-30 20201 1.14 1392 0.79 3788 2.38 6186 1.42 5112 0.43 3598 0.56 125 0.00
40 2023-10-07 21369 1.39 1761 0.28 4333 2.75 6456 1.95 4823 0.37 3878 0.72 118 0.00
41 2023-10-14 21732 1.80 1927 0.83 3897 3.70 6281 2.48 5685 0.63 3828 1.04 114 0.00
42 2023-10-21 22467 2.38 2015 0.69 3889 4.78 6834 3.72 6005 0.60 3599 1.25 125 0.00
43 2023-10-28 21532 3.20 1970 1.78 4049 6.10 6814 4.21 5546 1.23 3039 1.74 114 0.00
44 2023-11-04 22822 4.05 1904 2.15 4338 6.75 6999 5.80 5979 1.67 3458 2.31 144 2.78

Positive human parainfluenza virus (HPIV) tests

Figure 6: Positive human parainfluenza virus (HPIV) tests (%) in Canada by region by surveillance week
Figure 6
Figure 6: 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 2023-09-02 6254 2.00 362 1.38 847 3.90 3406 1.85 1004 1.10 635 2.05
36 2023-09-09 6321 1.49 355 1.69 868 2.19 3420 1.43 1133 0.97 545 1.65
37 2023-09-16 7407 1.61 401 2.49 1053 2.18 3886 1.34 1314 1.07 753 2.66
38 2023-09-23 8182 1.76 430 2.79 1122 2.85 4366 1.74 1488 0.87 776 1.42
39 2023-09-30 8615 1.32 401 1.25 1117 1.88 4948 1.33 1403 1.07 746 0.94
40 2023-10-07 8098 1.40 467 3.43 1178 2.04 4850 1.20 848 0.12 755 1.85
41 2023-10-14 8876 1.28 491 1.63 1094 1.37 4898 1.16 1635 1.04 758 2.24
42 2023-10-21 9280 1.59 498 2.21 1050 1.52 5293 1.51 1706 1.47 733 2.18
43 2023-10-28 9074 1.20 474 1.48 1053 1.90 5223 0.96 1655 0.85 669 2.69
44 2023-11-04 9095 1.46 492 2.24 1049 2.10 5214 1.00 1647 1.34 693 3.75

Positive adenovirus (ADV) tests

Figure 7: Positive adenovirus (ADV) tests (%) in Canada by region by surveillance week
Figure 7
Figure 7: 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 2023-09-02 6258 1.61 362 1.93 851 2.70 3406 0.91 1004 2.39 635 2.52
36 2023-09-09 6332 1.50 355 1.97 879 2.28 3420 0.82 1133 1.94 545 3.30
37 2023-09-16 7426 1.47 401 2.00 1071 2.43 3887 0.90 1314 1.98 753 1.86
38 2023-09-23 8192 0.93 429 1.17 1134 1.06 4365 0.62 1488 1.55 776 1.16
39 2023-09-30 8602 1.15 401 1.00 1129 2.04 4923 0.69 1403 1.64 746 2.01
40 2023-10-07 8116 1.36 467 2.36 1195 2.85 4851 0.66 848 1.42 755 2.78
41 2023-10-14 8910 1.38 491 1.63 1111 3.42 4915 0.75 1635 1.47 758 2.11
42 2023-10-21 9285 1.43 498 1.20 1058 3.59 5292 0.76 1704 1.47 733 3.27
43 2023-10-28 9088 1.49 474 2.74 1067 3.66 5223 0.69 1655 1.63 669 2.99
44 2023-11-04 9113 1.73 492 2.03 1067 3.94 5214 1.04 1647 2.06 693 2.60

Positive human metapneumovirus (HMPV) tests

Figure 8: Positive human metapneumovirus (HMPV) tests (%) in Canada by region by surveillance week
Figure 8
Figure 8: 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 2023-09-02 6270 0.33 362 0.00 848 1.42 3407 0.21 1018 0.10 635 0.16
36 2023-09-09 6338 0.38 355 0.28 867 1.38 3423 0.20 1148 0.17 545 0.37
37 2023-09-16 7443 0.38 401 0.50 1053 0.76 3886 0.36 1350 0.00 753 0.53
38 2023-09-23 8237 0.38 429 0.00 1124 1.07 4365 0.14 1543 0.13 776 1.42
39 2023-09-30 8668 0.51 401 0.25 1118 0.89 4948 0.36 1455 0.34 746 1.34
40 2023-10-07 8138 0.32 457 0.44 1180 0.76 4853 0.14 893 0.34 755 0.66
41 2023-10-14 7815 0.42 484 0.00 1096 1.00 4915 0.20 562 0.36 758 1.32
42 2023-10-21 8151 0.52 498 0.20 1050 1.33 5298 0.32 572 0.35 733 1.09
43 2023-10-28 7906 0.52 474 0.63 1056 1.42 5200 0.31 507 0.39 669 0.75
44 2023-11-04 8002 0.60 492 0.20 1052 1.81 5217 0.17 548 2.01 693 1.15

Positive enterovirus/rhinovirus (EV/RV) tests

Figure 9: Positive enterovirus/rhinovirus (EV/RV) tests (%) in Canada by region by surveillance week
Figure 9
Figure 9: 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 2023-09-02 5350 12.52 362 20.72 - - 3409 10.44 971 14.73 608 15.79
36 2023-09-09 5398 14.84 355 25.35 - - 3423 12.80 1103 16.77 516 17.05
37 2023-09-16 6300 18.29 401 23.69 - - 3887 16.08 1283 22.45 722 19.81
38 2023-09-23 7034 19.99 429 27.51 - - 4365 17.11 1471 23.73 747 24.63
39 2023-09-30 7467 18.56 401 26.43 - - 4948 15.74 1386 22.44 715 25.31
40 2023-10-07 6883 17.65 467 23.55 - - 4853 14.77 839 25.51 706 23.80
41 2023-10-14 7759 15.74 491 23.01 - - 4915 13.77 1609 15.97 717 23.15
42 2023-10-21 8203 13.12 498 22.09 - - 5298 10.82 1680 13.51 695 22.16
43 2023-10-28 7976 12.53 474 16.03 - - 5227 9.95 1623 15.59 637 23.23
44 2023-11-04 8014 10.58 492 17.07 - - 5217 8.40 1637 11.67 645 20.78

Positive human coronavirus (HCoV) tests

Figure 10: Positive human coronavirus (HCoV) tests (%) in Canada by region by surveillance week
Figure 10
Figure 10: 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 2023-09-02 5074 0.30 362 0.00 847 0.47 2230 0.13 1027 0.68 608 0.16
36 2023-09-09 5195 0.42 355 0.56 868 0.81 2285 0.09 1171 0.77 516 0.39
37 2023-09-16 6162 0.23 401 0.50 1053 0.47 2636 0.23 1350 0.00 722 0.14
38 2023-09-23 6839 0.45 429 0.00 1122 0.80 2995 0.40 1546 0.39 747 0.54
39 2023-09-30 7014 0.27 401 0.00 1117 0.45 3325 0.21 1456 0.41 715 0.14
40 2023-10-07 6612 0.27 467 0.21 1178 0.08 3390 0.18 894 0.34 683 1.02
41 2023-10-14 7432 0.32 491 0.20 1094 0.73 3461 0.12 1669 0.60 717 0.14
42 2023-10-21 7696 0.17 498 0.20 1050 0.48 3707 0.05 1746 0.23 695 0.14
43 2023-10-28 7563 0.38 473 0.42 1053 0.38 3707 0.30 1693 0.53 637 0.47
44 2023-11-04 7353 0.39 476 0.21 1049 0.29 3507 0.43 1676 0.24 645 0.93

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