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Respiratory Virus Report, Week 43 - ending October 28, 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 43 (week ending October 28, 2023) in Canada, participating RVDSS laboratories reported 6,676 detections of SARS-CoV-2 from 37,246 tests (17.9% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 6,914 to 22,025 tests), activity of RSV is low but increasing.

  • While there has been an observed increase in national SARS-CoV-2 percent positivity since early-July, some jurisdictions are showing early signs of levelling off or decreasing.
  • Activity of RSV is slightly above expected levels for this time of year (676 detections; 3.3% positive) but overall remains low. While activity of RSV is increasing, 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 October 28, 2023 (surveillance week 2023-43)
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 509 95 367 0 0 8 8 0 367 4 367 0 0 1 2 0 367 7 367 3 367 43 367 2
Prince Edward Island 180 34 65 0 0 0 0 0 65 2 10 0 0 0 0 0 10 0 10 0 10 3 10 0
Nova Scotia 1464 298 714 0 0 5 5 0 714 16 27 1 0 0 1 0 27 3 27 0 27 10 26 0
New Brunswick 958 138 833 6 0 0 6 0 824 13 70 0 0 0 2 0 70 3 70 0 70 20 70 0
Atlantic 3111 565 1979 6 0 13 19 0 1970 35 474 1 0 1 5 0 474 13 474 3 474 76 473 2
Région Nord-Est 1604 304 1195 0 0 4 4 0 351 11 64 1 0 0 0 0 64 4 62 0 N.C. N.C. 64 0
Québec-Chaudière-Appalaches 2135 352 689 0 0 3 3 1 689 36 255 0 0 0 2 0 268 9 255 5 N.C. N.C. 255 0
Centre-du-Québec 2407 496 513 0 0 6 6 0 510 25 39 0 2 0 0 0 39 4 39 0 N.C. N.C. 39 0
Montréal-Laval 2687 419 1251 0 0 6 6 1 1100 84 657 4 1 5 2 0 657 20 663 10 N.C. N.C. 657 4
Ouest du Québec 1655 344 581 0 0 1 1 2 580 39 28 2 0 0 0 0 28 2 28 0 N.C. N.C. 28 0
Montérégie 1517 281 852 0 0 12 12 2 813 51 4 0 0 0 0 0 4 0 4 0 N.C. N.C. 4 0
Province of Québec 12005 2196 5081 0 0 32 32 6 4043 246 1047 7 3 5 4 0 1060 39 1051 15 N.C. N.C. 1047 4
P.H.O.L. - Ottawa 400 171 297 1 0 0 1 0 297 0 185 0 0 0 0 2 185 0 185 0 185 36 185 6
EORLA 1360 156 499 0 0 4 4 0 499 70 35 0 0 0 0 0 35 0 35 0 35 9 35 0
P.H.O.L. - Kingston 265 109 184 1 0 0 0 0 184 2 129 0 0 0 0 1 129 0 129 0 129 23 129 0
UHN / Mount Sinai Hospital 1053 106 657 0 0 2 2 1 657 4 20 0 0 1 0 0 20 0 20 0 20 1 20 0
P.H.O.L. - Toronto 743 283 1072 9 1 0 8 0 1073 17 941 0 0 0 0 21 941 4 941 8 941 129 941 2
Sick Kids Hospital - Toronto 127 6 103 0 1 0 1 0 103 15 103 1 1 1 0 0 103 6 103 2 103 34 103 0
Shared Hospital Laboratory 1340 107 1340 6 1 0 7 0 1340 57 1344 0 0 0 0 2 1344 11 1321 3 1348 58 1348 2
P.H.O.L. - Sault Ste. Marie 10 10 5 0 0 0 0 0 5 0 3 0 0 0 0 1 3 0 3 0 3 0 3 0
P.H.O.L. - Timmins 73 39 58 0 0 0 0 0 58 1 40 0 0 0 0 1 40 0 40 0 40 4 40 0
St. Joseph's - London 942 183 247 0 0 1 1 0 247 18 248 0 0 0 0 1 248 2 248 0 248 26 247 1
P.H.O.L. - London 619 216 337 0 1 0 1 0 337 10 272 0 0 0 0 7 272 1 272 0 272 35 272 0
P.H.O.L. - Orillia 25 7 62 0 0 0 0 0 62 5 62 0 0 0 0 1 62 2 62 0 62 13 62 0
P.H.O.L. - Thunder Bay 79 38 46 0 0 0 0 0 46 0 24 0 0 0 0 0 24 0 24 0 24 1 24 0
P.H.O.L. - Sudbury 16 13 16 0 0 0 0 0 16 0 15 0 0 0 0 0 15 0 15 0 15 0 15 0
P.H.O.L. - Hamilton 217 111 176 1 0 0 1 1 176 10 128 0 0 0 0 1 128 2 128 1 128 16 128 0
P.H.O.L. - Peterborough 45 12 85 0 0 1 1 0 85 12 84 0 0 0 0 3 84 3 84 0 84 23 84 0
St. Joseph's - Hamilton 1754 198 1519 0 0 7 7 2 1519 66 1519 0 0 5 0 0 1519 5 1519 2 1519 108 0 0
Sault Area Hospital 207 29 110 0 0 0 0 0 110 0 67 0 0 0 0 0 67 0 67 0 67 4 67 0
Province of Ontario 9275 1794 6813 18 4 15 34 4 6814 287 5219 1 1 7 0 41 5219 36 5196 16 5223 520 3703 11
Manitoba 1504 280 1083 0 0 4 4 0 1083 8 80 0 1 0 3 0 80 5 118 1 80 25 118 0
Saskatchewan 2355 417 885 0 0 37 37 1 849 8 302 3 0 1 0 0 302 6 302 1 302 48 302 0
Alberta 5528 900 3042 48 13 1 62 7 2852 40 643 2 1 0 0 0 643 8 42 0 634 104 643 3
Prairies 9387 1597 5010 48 13 42 103 8 4784 56 1025 5 2 1 3 0 1025 19 462 2 1016 177 1063 3
British Columbia 3268 483 3028 18 2 0 44 3 3028 52 660 6 3 1 8 0 660 20 660 5 628 145 628 3
Yukon 43 3 30 0 0 0 0 0 30 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 17 3 15 1 0 0 1 0 15 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 15 2 N.C. N.C.
Nunavut 140 35 69 0 0 0 0 0 69 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 200 41 114 1 0 0 1 0 114 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 15 2 N.C. N.C.
CANADA 37246 6676 22025 91 19 102 233 21 20753 676 8425 20 9 15 20 41 8438 127 7843 41 7356 920 6914 23

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 October 28, 2023 (surveillance weeks 2023-35 to 2023-43)
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 4545 818 2940 0 0 13 13 0 2940 22 2940 2 6 5 33 0 2940 38 2940 9 2940 589 2940 8
Prince Edward Island 1686 216 335 0 0 2 2 0 335 2 75 0 0 0 2 0 74 4 64 0 74 38 74 0
Nova Scotia 12819 3218 5073 0 0 24 24 1 5073 52 327 13 1 1 4 0 327 17 320 1 327 112 326 0
New Brunswick 7605 1136 5411 10 0 5 15 1 5315 32 537 6 2 0 5 0 537 10 537 0 537 154 537 1
Atlantic 26655 5388 13759 10 0 44 54 2 13663 108 3879 21 9 6 44 0 3878 69 3861 10 3878 893 3877 9
Région Nord-Est 14503 2666 10102 0 0 16 16 1 2318 56 531 9 4 2 13 0 531 16 527 10 N.C. N.C. 531 0
Québec-Chaudière-Appalaches 19842 3568 4911 0 0 18 18 3 4911 162 2153 8 2 1 8 0 2265 102 2153 26 N.C. N.C. 2153 2
Centre-du-Québec 19614 4082 3432 0 0 12 12 4 3420 114 271 9 4 2 3 0 271 14 271 4 N.C. N.C. 271 1
Montréal-Laval 28984 4730 11464 0 0 48 48 4 10328 344 6192 58 20 25 17 0 6192 109 6207 60 N.C. N.C. 6192 44
Ouest du Québec 16292 4014 4485 1 0 20 21 6 4478 142 172 7 3 1 4 0 172 12 172 3 N.C. N.C. 172 1
Montérégie 13778 2724 7146 0 0 24 24 7 6618 177 57 1 0 0 1 0 57 0 57 0 N.C. N.C. 57 0
Province of Québec 113013 21784 41540 1 0 138 139 25 32073 995 9376 92 33 31 46 0 9488 253 9387 103 N.C. N.C. 9376 48
P.H.O.L. - Ottawa 3614 1337 2055 10 0 1 11 0 2055 10 1226 0 0 0 0 19 1226 0 1226 1 1226 242 1226 6
EORLA 11055 1228 3821 0 0 14 14 4 3821 267 274 0 3 2 1 0 249 1 274 1 274 73 274 1
P.H.O.L. - Kingston 2510 719 1166 1 0 0 0 0 1166 4 885 0 0 0 0 23 885 2 885 0 885 195 885 1
UHN / Mount Sinai Hospital 8836 717 5010 0 0 9 9 6 5010 19 198 0 0 4 0 0 198 1 198 0 198 13 198 0
P.H.O.L. - Toronto 5412 1807 8217 61 22 2 61 0 8218 71 7414 0 0 0 0 222 7415 71 7411 35 7414 1588 7411 20
Sick Kids Hospital - Toronto 970 62 851 9 7 6 22 1 851 63 851 9 4 5 4 0 851 23 851 6 851 138 851 4
Shared Hospital Laboratory 10453 1021 10453 15 15 0 30 2 10454 266 10456 0 0 0 0 76 10454 75 10447 11 10474 712 10474 15
P.H.O.L. - Sault Ste. Marie 125 97 120 0 0 0 0 0 120 0 63 0 0 0 0 1 63 0 63 0 63 12 63 0
P.H.O.L. - Timmins 275 73 220 0 0 0 0 0 220 3 186 0 0 0 0 10 186 2 186 0 186 23 186 0
St. Joseph's - London 7161 1035 799 0 0 1 1 0 799 32 776 0 0 0 0 9 793 6 793 0 793 118 793 2
P.H.O.L. - London 4414 1425 2885 0 3 0 3 1 2885 25 2284 0 0 0 0 51 2284 11 2284 0 2284 404 2284 0
P.H.O.L. - Orillia 172 26 362 1 1 0 2 0 361 10 348 0 0 0 0 9 348 8 348 2 348 94 348 0
P.H.O.L. - Thunder Bay 576 228 307 0 0 0 0 0 307 0 229 0 0 0 0 5 229 1 229 1 229 35 229 1
P.H.O.L. - Sudbury 150 59 170 0 0 0 0 0 168 0 132 0 0 0 0 1 133 1 132 0 132 32 132 0
P.H.O.L. - Hamilton 2308 720 1762 4 1 0 2 1 1762 26 1252 0 0 0 0 40 1252 14 1252 12 1252 297 1252 1
P.H.O.L. - Peterborough 640 206 606 0 0 1 1 1 606 55 537 0 0 0 0 16 537 8 537 1 537 146 537 2
St. Joseph's - Hamilton 14912 1623 12596 0 0 29 29 11 12596 265 12596 0 0 35 0 0 12596 70 12596 32 12596 1205 0 0
Sault Area Hospital 1078 130 748 0 1 0 1 0 741 2 579 0 0 2 0 0 579 6 579 0 579 105 589 0
Province of Ontario 74661 12513 52148 101 50 63 186 27 52140 1118 40286 9 7 48 5 482 40278 300 40291 102 40321 5432 27732 53
Manitoba 13249 2267 10239 0 1 26 27 5 10239 35 604 0 5 4 21 0 604 33 971 2 604 256 971 3
Saskatchewan 16295 2124 7039 0 0 65 65 4 6841 35 2803 6 5 1 6 0 2803 83 2798 20 2788 591 2803 7
Alberta 43375 6584 29013 237 44 9 290 30 26985 150 8809 32 31 9 3 0 8807 96 5240 0 8644 1424 8808 40
Prairies 72919 10975 46291 237 45 100 382 39 44065 220 12216 38 41 14 30 0 12214 212 9009 22 12036 2271 12582 50
British Columbia 30928 6012 27837 242 42 14 383 15 27820 223 6361 30 21 16 58 0 6361 153 6361 56 6054 1325 6031 21
Yukon 508 64 284 0 1 0 2 0 284 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 177 27 139 1 0 0 1 0 139 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 139 46 N.C. N.C.
Nunavut 838 135 536 0 0 0 0 0 536 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 1523 226 959 1 1 0 3 0 959 1 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 139 46 N.C. N.C.
CANADA 319699 56898 182534 592 138 359 1147 108 170720 2665 72118 190 111 115 183 482 72219 987 68909 293 62428 9967 59598 181

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 17.92 15.78 1.06 5.47 0.03 5.19 0.68 2.59 0.10 0.03 0.02 0.55 0.06 0.23 3.26 6.76 8.11 2.16 0.55 1.41
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 1.60 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 12.51 11.05 19.64 28.73 21.67 24.95 1.25 4.41 9.38 3.98 3.18 3.54 1.51 1.79 1.15 2.42 1.63 1.96 0.52 1.79 0.36 1.64 0.12 0.58 0.33 1.86 1.05 2.35 0.27 0.75

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 39349 17.78 3493 19.70 12589 18.62 9300 16.86 10040 17.16 3737 17.13 190 18.42
43 2023-10-28 37246 17.92 3111 18.16 12005 18.29 9275 19.34 9387 17.01 3268 14.78 200 20.50

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 24044 0.73 0.08 2029 0.69 0.05 5110 0.37 0.02 6834 0.47 0.07 6347 1.13 0.13 3599 1.06 0.11 125 0.00 0.00
43 2023-10-28 22025 1.06 0.10 1979 0.96 0.00 5081 0.63 0.12 6813 0.50 0.06 5010 2.06 0.16 3028 1.45 0.10 114 0.88 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
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 22457 2.38 2015 0.69 3889 4.78 6834 3.72 5995 0.60 3599 1.25 125 0.00
43 2023-10-28 20753 3.26 1970 1.78 4043 6.08 6814 4.21 4784 1.17 3028 1.72 114 0.00

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 9271 1.60 498 2.21 1050 1.52 5293 1.51 1697 1.47 733 2.18
43 2023-10-28 8425 1.25 474 1.48 1047 1.81 5219 0.96 1025 1.07 660 2.73

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 9276 1.43 498 1.20 1058 3.59 5292 0.76 1695 1.47 733 3.27
43 2023-10-28 8438 1.51 474 2.74 1060 3.68 5219 0.69 1025 1.85 660 3.03

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 8152 0.52 498 0.20 1050 1.33 5298 0.32 573 0.35 733 1.09
43 2023-10-28 7843 0.52 474 0.63 1051 1.43 5196 0.31 462 0.43 660 0.76

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 8194 13.12 498 22.09 - - 5298 10.82 1671 13.52 695 22.16
43 2023-10-28 7356 12.51 474 16.03 - - 5223 9.96 1016 17.42 628 23.09

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 7687 0.17 498 0.20 1050 0.48 3707 0.05 1737 0.23 695 0.14
43 2023-10-28 6914 0.33 473 0.42 1047 0.38 3703 0.30 1063 0.28 628 0.48

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