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Respiratory Virus Report, Week 47 - ending November 25, 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 47 (week ending November 25, 2023) in Canada, participating RVDSS laboratories reported 8,137 detections of SARS-CoV-2 from 42,135 tests (19.3% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 8,423 to 28,421 tests), activity of both flu and RSV has increased in recent weeks, as is expected at this time of year.

  • In recent weeks national SARS-CoV-2 percent positivity has increased slightly, but trends vary by region.
  • At the national level, activity of influenza has increased in recent weeks, but is within expected levels for this time of year (2,143 detections; 7.5% positive). Influenza percent positivity currently varies greatly by region.
  • Activity of RSV continues to increase but is within expected levels for this time of year (1,815 detections; 6.9% positive).
  • 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 25, 2023 (surveillance week 2023-47)
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 702 168 482 0 0 43 43 0 482 22 482 1 1 0 5 0 482 10 482 5 482 41 482 2
Prince Edward Island 256 55 117 0 0 1 1 0 117 2 11 0 0 0 1 0 11 0 11 0 11 3 11 0
Nova Scotia 1514 393 953 0 0 16 16 0 821 50 24 1 0 0 0 0 24 0 24 1 24 7 24 0
New Brunswick 1018 164 969 20 0 36 56 1 943 37 103 0 0 0 2 0 103 7 103 0 103 23 103 2
Atlantic 3490 780 2521 20 0 96 116 1 2363 111 620 2 1 0 8 0 620 17 620 6 620 74 620 4
Région Nord-Est 1544 311 1273 0 0 23 23 0 429 39 56 2 0 1 0 0 56 7 51 3 N.C. N.C. 56 0
Québec-Chaudière-Appalaches 2171 462 1118 0 0 8 8 0 1119 125 548 2 1 0 0 0 562 23 549 11 N.C. N.C. 460 4
Centre-du-Québec 2583 513 906 0 0 27 27 2 549 85 47 1 0 0 1 0 47 5 47 2 N.C. N.C. 48 0
Montréal-Laval 3082 649 1732 0 0 37 37 1 1367 180 756 1 3 2 0 0 756 21 760 21 N.C. N.C. 756 9
Ouest du Québec 1631 451 496 0 0 10 10 0 495 68 14 0 0 0 0 0 14 1 14 0 N.C. N.C. 14 0
Montérégie 1856 375 1028 0 0 29 29 1 1004 88 9 0 0 0 0 0 9 1 9 0 N.C. N.C. 9 0
Province of Québec 12867 2761 6553 0 0 134 134 4 4963 585 1430 6 4 3 1 0 1444 58 1430 37 N.C. N.C. 1343 13
P.H.O.L. - Ottawa 352 165 206 16 4 0 5 0 205 8 125 0 0 0 0 0 125 0 125 0 125 8 125 3
EORLA 1431 255 690 0 0 31 31 0 690 116 26 0 0 0 0 0 26 0 26 0 26 7 26 0
P.H.O.L. - Kingston 217 108 153 1 0 0 1 0 153 14 92 0 0 0 0 1 92 1 92 0 92 10 92 0
UHN / Mount Sinai Hospital 1346 194 727 8 0 0 8 1 727 17 30 0 0 0 0 0 30 0 30 0 30 1 30 0
P.H.O.L. - Toronto 841 355 1185 39 10 11 51 0 1185 59 1059 0 0 0 0 33 1063 17 1059 8 1059 69 1059 7
Sick Kids Hospital - Toronto 125 15 125 3 2 5 10 0 125 24 125 0 1 0 4 0 125 2 125 0 125 36 125 3
Shared Hospital Laboratory 2132 261 1659 25 15 6 46 0 1658 129 1644 0 0 0 0 11 1644 17 1652 5 1652 55 1652 6
P.H.O.L. - Sault Ste. Marie 13 9 13 0 0 0 0 0 13 0 10 0 0 0 0 0 10 0 10 0 10 0 10 0
P.H.O.L. - Timmins 26 5 21 0 0 0 0 0 21 5 14 0 0 0 0 0 14 0 14 0 14 0 14 0
St. Joseph's - London 897 175 498 0 0 9 9 1 498 61 38 0 0 0 0 0 38 2 38 0 38 3 38 0
P.H.O.L. - London 683 279 453 13 1 0 8 0 453 55 355 0 0 0 0 8 355 3 355 2 355 21 355 1
P.H.O.L. - Orillia 8 2 28 1 0 0 1 0 28 3 28 0 0 0 0 1 28 0 28 1 28 1 28 0
P.H.O.L. - Thunder Bay 87 28 50 0 0 0 0 0 50 0 41 0 0 0 0 6 41 0 41 0 41 1 41 0
P.H.O.L. - Sudbury 32 27 31 0 0 0 0 0 31 0 11 0 0 0 0 0 11 0 11 0 11 2 11 0
P.H.O.L. - Hamilton 357 180 281 3 0 1 2 0 281 20 177 0 0 0 0 4 177 2 177 1 177 16 177 1
P.H.O.L. - Peterborough 92 36 75 3 0 0 3 0 75 19 75 0 0 0 0 6 75 1 75 0 75 10 75 1
St. Joseph's - Hamilton 2018 269 1738 0 0 44 44 0 1738 169 1738 0 0 5 0 0 1738 16 1738 8 1738 84 0 0
Sault Area Hospital 227 50 139 3 2 0 5 0 139 0 111 2 0 1 1 0 111 0 111 0 111 11 111 0
Province of Ontario 10884 2413 8072 115 34 107 224 2 8070 699 5699 2 1 6 5 70 5703 61 5707 25 5707 335 3969 22
Manitoba 1757 411 1368 1 3 80 84 0 1368 28 106 0 0 1 6 0 106 2 143 1 106 12 143 1
Saskatchewan 2983 448 2085 0 0 618 618 4 1925 34 521 0 0 0 1 0 521 10 521 8 521 24 521 0
Alberta 6580 909 4229 611 32 61 704 14 3950 164 999 6 3 4 0 0 998 12 987 4 993 73 999 8
Prairies 11320 1768 7682 612 35 759 1406 18 7243 226 1626 6 3 5 7 0 1625 24 1651 13 1620 109 1663 9
British Columbia 3385 403 3461 84 17 3 218 3 3389 179 852 7 12 2 9 0 856 33 856 26 828 129 828 8
Yukon 64 3 42 0 0 0 1 0 42 2 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 22 1 22 4 0 0 4 0 22 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 22 6 N.C. N.C.
Nunavut 103 8 68 0 0 12 12 0 68 13 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 189 12 132 4 0 12 17 0 132 15 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 22 6 N.C. N.C.
CANADA 42135 8137 28421 835 86 1111 2115 28 26160 1815 10227 23 21 16 30 70 10270 196 10286 108 8797 653 8423 56

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 25, 2023 (surveillance weeks 2023-35 to 2023-47)
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 6816 1314 4485 0 0 122 122 1 4485 70 4485 6 12 6 47 0 4485 80 4485 18 4485 747 4485 16
Prince Edward Island 2517 346 738 0 0 8 8 0 738 5 118 0 0 0 5 0 117 5 107 0 117 52 101 0
Nova Scotia 18562 4635 8219 0 0 68 68 6 8087 180 478 15 2 1 8 0 478 22 471 2 478 157 477 0
New Brunswick 11507 1732 9040 47 4 56 107 2 8873 115 877 6 2 0 16 0 877 24 877 0 877 244 877 3
Atlantic 39402 8027 22482 47 4 254 305 9 22183 370 5958 27 16 7 76 0 5957 131 5940 20 5957 1200 5940 19
Région Nord-Est 21071 4061 15412 0 0 51 51 1 4348 155 787 13 7 3 14 0 787 37 774 17 N.C. N.C. 787 1
Québec-Chaudière-Appalaches 28315 5169 8621 0 0 37 37 7 8627 513 3941 16 7 1 9 0 4114 181 3943 60 N.C. N.C. 3677 8
Centre-du-Québec 29562 6022 7203 0 0 68 68 7 5816 423 480 12 7 5 4 0 480 26 480 10 N.C. N.C. 486 2
Montréal-Laval   40377 6768 17533 0 0 131 131 9 15417 874 9014 77 29 38 19 0 9014 188 9037 132 N.C. N.C. 9014 71
Ouest du Québec 22989 5755 6892 1 0 55 56 8 6874 367 279 9 3 2 5 0 279 19 279 3 N.C. N.C. 279 1
Montérégie 20537 3991 10932 0 0 107 107 11 10243 446 73 1 0 0 1 0 73 2 73 0 N.C. N.C. 73 0
Province of Québec 162851 31766 66593 1 0 449 450 43 51325 2778 14574 128 53 49 52 0 14747 453 14586 222 N.C. N.C. 14316 83
P.H.O.L. - Ottawa 4932 1861 2926 32 6 3 20 0 2925 46 1757 0 0 0 0 24 1757 2 1757 8 1757 304 1757 24
EORLA 17246 2175 6362 0 0 90 90 8 6362 655 413 2 3 2 3 0 388 4 413 1 413 108 413 2
P.H.O.L. - Kingston 3375 1092 1681 2 0 0 1 0 1681 43 1273 0 0 0 0 27 1273 6 1273 0 1273 247 1273 1
UHN / Mount Sinai Hospital 13472 1236 7812 21 0 14 35 13 7812 65 303 0 0 4 1 0 303 1 303 0 303 18 303 1
P.H.O.L. - Toronto   8149 2825 12621 191 60 22 213 4 12619 247 11373 0 0 0 0 320 11378 120 11370 62 11373 1910 11370 36
Sick Kids Hospital - Toronto 1571 108 1362 19 16 25 60 1 1362 177 1362 11 7 9 11 0 1362 35 1362 6 1362 286 1362 7
Shared Hospital Laboratory 17770 1941 16474 64 45 12 121 3 16476 714 16444 0 0 0 0 106 16442 128 16449 19 16476 939 16451 33
P.H.O.L. - Sault Ste. Marie 201 151 158 0 0 0 0 0 158 1 91 0 0 0 0 1 91 0 91 0 91 15 91 0
P.H.O.L. - Timmins 470 171 347 0 0 0 0 0 347 10 278 0 0 0 0 12 278 4 278 0 278 34 278 0
St. Joseph's - London   10477 1619 2524 0 0 21 21 4 2524 194 1018 0 0 0 0 12 1035 10 1035 1 1035 150 1035 4
P.H.O.L. - London 6711 2314 4431 28 11 1 21 1 4431 157 3469 0 0 0 0 74 3469 18 3469 2 3469 516 3469 1
P.H.O.L. - Orillia 236 55 552 3 1 0 4 0 551 32 538 0 0 0 0 16 538 11 538 3 538 121 538 0
P.H.O.L. - Thunder Bay 849 310 431 0 0 0 0 0 431 0 344 0 0 0 0 15 344 2 344 1 344 43 344 1
P.H.O.L. - Sudbury 302 157 285 0 0 0 0 0 283 1 199 0 0 0 0 4 200 1 199 0 199 36 199 0
P.H.O.L. - Hamilton 3407 1174 2728 13 1 1 7 1 2728 80 1962 0 0 0 0 54 1962 26 1962 15 1962 366 1962 3
P.H.O.L. - Peterborough 945 356 935 3 0 1 4 1 935 132 826 0 0 0 0 23 826 14 826 2 826 190 826 3
St. Joseph's - Hamilton 22609 2533 19323 0 0 135 135 14 19323 833 19323 0 0 55 0 0 19323 122 19323 47 19323 1608 0 0
Sault Area Hospital 1961 281 1302 7 3 1 11 0 1295 5 977 7 0 3 7 0 977 11 977 0 977 143 987 0
Province of Ontario 114683 20359 82254 383 143 326 743 50 82243 3392 61950 20 10 73 22 688 61946 515 61969 167 61999 7034 42658 116
Manitoba    20010 3874 15483 1 6 218 225 5 15483 95 961 0 5 5 34 0 961 48 1475 5 961 321 1475 5
Saskatchewan 28154 3893 14588 23 4 2054 2081 20 13916 141 5280 8 4 2 9 0 5280 147 5280 58 5280 793 5280 9
Alberta 68130 10530 47413 2222 169 175 2566 89 44010 704 14194 63 42 38 3 0 14191 163 14024 7 13927 1947 14193 83
Prairies 116294 18297 77484 2246 179 2447 4872 114 73409 940 20435 71 51 45 46 0 20432 358 20779 70 20168 3061 20948 97
British Columbia 44745 7905 41589 575 109 34 947 31 41499 750 9609 62 64 31 94 0 9613 250 9498 116 9149 1915 9126 45
Yukon 750 90 438 0 2 0 4 0 438 10 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 270 33 221 9 4 0 13 0 221 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 221 58 N.C. N.C.
Nunavut 1286 170 822 0 1 12 13 0 822 27 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 2306 293 1481 9 7 12 30 0 1481 37 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 221 58 N.C. N.C.
CANADA 480281 86647 291883 3261 442 3522 7347 247 272140 8267 112526 308 194 205 290 688 112717 1710 112794 596 97494 13268 92988 360

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 14.40 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 15.92 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 16.49 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 0.66 0.96 0.00 2.17 1.01 1.58 0.05 0.03 0.02 0.20 0.05 0.11 1.35 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 1.18 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
44 2023-11-04 17.74 13.91 2.66 10.75 0.10 8.32 1.08 3.35 0.10 0.03 0.10 0.71 0.12 0.31 4.06 7.77 7.82 3.35 0.83 2.07
45 2023-11-11 18.17 12.43 4.79 16.19 0.07 9.83 1.18 4.19 0.14 0.04 0.06 0.97 0.22 0.44 5.16 7.68 7.03 4.43 1.29 2.71
46 2023-11-18 18.80 11.96 7.47 20.23 0.10 13.89 1.42 5.43 0.16 0.05 0.06 1.49 0.09 0.57 5.85 7.54 7.18 6.33 1.38 3.60
47 2023-11-25 19.31 11.76 7.44 24.27 0.13 15.25 1.25 6.91 0.10 0.04 0.07 2.13 0.13 0.80 6.94 6.66 8.10 8.69 1.79 4.79
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 12.50 15.47 21.96 27.19 22.44 24.71 1.99 2.80 5.99 3.16 1.15 2.44 1.62 2.28 1.18 1.74 0.99 1.43 0.34 1.80 0.23 2.04 0.10 0.78 0.28 0.53 1.05 0.76 0.18 0.45
36 2023-09-09 14.85 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 1.60 3.02 5.97 3.26 1.65 2.40 1.47 2.10 0.81 2.44 1.38 1.86 0.39 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 20.25 23.50 33.19 39.57 32.80 35.83 1.77 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 0.46 0.32 0.67 1.36 0.06 0.43
39 2023-09-30 18.51 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 0.28 0.59 0.62 0.66 0.07 0.45
40 2023-10-07 17.45 19.32 26.26 41.29 33.00 35.43 1.34 3.69 8.19 3.28 1.90 2.43 1.41 1.79 1.31 2.25 1.39 1.82 0.32 1.49 0.16 0.92 0.05 0.34 0.26 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 0.37 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 0.46 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 1.21 4.41 9.38 3.98 3.18 3.54 1.48 1.79 1.15 2.42 1.63 1.96 0.46 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 10.81 10.23 21.45 23.82 16.75 21.38 1.44 4.14 10.28 4.81 2.94 3.72 1.76 2.02 1.42 2.88 1.18 2.21 0.55 1.79 0.77 1.08 0.23 0.48 0.37 2.54 2.21 2.59 0.21 0.88
45 2023-11-11 10.70 7.77 22.39 23.08 15.17 20.56 1.65 3.90 9.97 5.42 2.53 4.01 1.46 1.99 1.63 2.68 2.02 2.42 0.61 2.06 0.64 1.30 0.04 0.77 0.42 3.00 2.57 2.74 0.52 0.96
46 2023-11-18 8.65 6.93 21.37 22.77 15.28 19.24 1.39 3.97 8.29 5.72 1.62 4.14 2.03 1.87 2.51 2.90 1.99 2.52 0.80 1.89 0.99 1.43 0.18 0.81 0.65 3.54 2.99 3.32 0.46 1.25
47 2023-11-25 7.42 4.88 18.54 20.84 12.15 16.09 1.56 3.63 7.04 7.00 2.36 4.72 1.91 1.89 1.94 2.95 1.83 2.35 1.05 1.78 1.01 2.02 0.09 0.90 0.66 3.24 3.90 3.26 0.37 1.25

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 25656 14.40 2110 16.92 9351 16.30 6230 12.39 5192 10.59 2651 18.03 122 11.48
36 2023-09-09 28237 15.92 2346 20.20 10215 17.37 6939 15.46 5968 11.90 2640 16.70 129 17.05
37 2023-09-16 31790 16.49 2567 18.62 11678 18.11 7337 15.66 6948 12.12 3111 20.64 149 10.07
38 2023-09-23 36264 18.61 2775 18.38 13455 20.48 8514 18.38 7969 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 42173 19.81 3544 24.41 15684 22.19 9349 17.61 9198 15.96 4202 20.75 196 12.24
41 2023-10-14 38463 17.55 3583 20.74 12605 18.30 8426 15.27 9625 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 37286 17.89 3095 17.74 12003 18.29 9276 19.35 9450 17.05 3262 14.87 200 18.00
44 2023-11-04 38183 17.74 2965 17.91 11975 18.42 9060 17.09 10341 18.12 3648 15.98 194 15.46
45 2023-11-11 38722 18.17 3122 20.12 11815 19.90 9607 18.24 10448 16.98 3545 14.41 185 10.81
46 2023-11-18 41435 18.80 3186 22.47 13182 20.21 10470 20.36 11137 16.83 3245 12.14 215 5.12
47 2023-11-25 42135 19.31 3490 22.35 12867 21.46 10884 22.17 11320 15.62 3385 11.91 189 6.35

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 18031 0.48 0.03 1216 0.08 0.00 4174 0.41 0.07 5145 0.29 0.00 4701 0.38 0.04 2703 1.29 0.04 92 0.00 0.00
38 2023-09-23 20119 0.51 0.02 1388 0.07 0.00 4734 0.30 0.00 5652 0.21 0.05 5323 0.62 0.02 2928 1.47 0.00 94 0.00 0.00
39 2023-09-30 21521 0.52 0.09 1403 0.14 0.07 4847 0.21 0.08 6186 0.37 0.11 5362 0.50 0.11 3598 1.36 0.06 125 0.00 0.00
40 2023-10-07 23652 0.66 0.05 1775 0.34 0.00 5628 0.37 0.04 6456 0.31 0.00 5797 0.79 0.16 3878 1.60 0.05 118 0.00 0.00
41 2023-10-14 23195 0.51 0.03 1938 0.57 0.00 4978 0.22 0.06 6283 0.30 0.00 6054 0.81 0.05 3828 0.73 0.03 114 0.00 0.00
42 2023-10-21 24050 0.73 0.08 2029 0.69 0.05 5110 0.37 0.02 6834 0.47 0.07 6353 1.13 0.13 3599 1.06 0.11 125 0.00 0.00
43 2023-10-28 23241 1.18 0.10 1979 0.96 0.00 5450 0.64 0.11 6814 0.50 0.06 5845 2.41 0.17 3039 1.45 0.10 114 0.88 0.00
44 2023-11-04 25300 2.66 0.10 1914 1.25 0.05 5705 0.63 0.07 6996 0.51 0.06 6979 6.89 0.17 3562 2.58 0.11 144 2.08 0.00
45 2023-11-11 25837 4.79 0.14 2069 2.03 0.14 5970 0.84 0.07 7240 1.22 0.07 6973 13.14 0.29 3460 3.96 0.14 125 3.20 0.00
46 2023-11-18 28559 7.47 0.16 2219 3.11 0.09 6456 1.36 0.09 7797 2.68 0.15 8708 18.91 0.26 3258 3.59 0.12 121 2.48 0.00
47 2023-11-25 28421 7.44 0.10 2521 4.60 0.04 6553 2.04 0.06 8072 2.78 0.02 7682 18.30 0.23 3461 6.30 0.09 132 12.88 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 16804 0.81 1201 0.25 3181 1.67 5138 1.01 4490 0.38 2702 0.41 92 0.00
38 2023-09-23 18780 1.15 1381 1.30 3652 2.27 5652 1.43 5073 0.37 2928 0.51 94 0.00
39 2023-09-30 20209 1.14 1392 0.79 3788 2.38 6186 1.42 5120 0.43 3598 0.56 125 0.00
40 2023-10-07 22036 1.35 1761 0.28 4333 2.75 6456 1.95 5490 0.36 3878 0.72 118 0.00
41 2023-10-14 21735 1.80 1927 0.83 3897 3.70 6281 2.48 5688 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 0.58 3599 1.25 125 0.00
43 2023-10-28 21718 3.26 1970 1.78 4234 6.24 6814 4.21 5547 1.23 3039 1.74 114 0.00
44 2023-11-04 23641 4.06 1904 2.15 4506 6.88 6997 5.80 6528 1.78 3562 2.36 144 2.78
45 2023-11-11 24136 5.16 2058 2.77 4680 7.97 7241 7.62 6573 2.01 3459 3.58 125 6.40
46 2023-11-18 26499 5.85 2195 2.41 4912 10.12 7795 7.92 8218 2.86 3258 4.27 121 7.44
47 2023-11-25 26160 6.94 2363 4.70 4963 11.79 8070 8.66 7243 3.12 3389 5.28 132 11.36

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 6234 1.99 362 1.38 847 3.90 3406 1.85 984 1.02 635 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 7419 1.60 401 2.49 1053 2.18 3886 1.34 1326 1.06 753 2.66
38 2023-09-23 8139 1.77 430 2.79 1122 2.85 4366 1.74 1445 0.90 776 1.42
39 2023-09-30 8626 1.32 401 1.25 1117 1.88 4948 1.33 1414 1.06 746 0.94
40 2023-10-07 8791 1.34 467 3.43 1178 2.04 4850 1.20 1541 0.39 755 1.85
41 2023-10-14 8879 1.28 491 1.63 1094 1.37 4898 1.16 1638 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 9084 1.21 474 1.48 1063 1.98 5223 0.96 1655 0.85 669 2.69
44 2023-11-04 9489 1.44 492 2.24 1067 2.06 5215 1.00 1931 1.24 784 3.57
45 2023-11-11 9601 1.65 467 2.78 1257 1.83 5242 1.11 1851 1.30 784 5.10
46 2023-11-18 10436 1.39 500 2.20 1428 1.33 5504 1.24 2185 0.87 819 3.42
47 2023-11-25 10227 1.56 620 1.77 1430 0.98 5699 1.47 1626 1.29 852 3.52

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 6238 1.62 362 1.93 851 2.70 3406 0.91 984 2.44 635 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 7438 1.47 401 2.00 1071 2.43 3887 0.90 1326 1.96 753 1.86
38 2023-09-23 8149 0.93 429 1.17 1134 1.06 4365 0.62 1445 1.59 776 1.16
39 2023-09-30 8613 1.15 401 1.00 1129 2.04 4923 0.69 1414 1.63 746 2.01
40 2023-10-07 8809 1.41 467 2.36 1195 2.85 4851 0.66 1541 1.69 755 2.78
41 2023-10-14 8913 1.38 491 1.63 1111 3.42 4915 0.75 1638 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 9098 1.48 474 2.74 1077 3.62 5223 0.69 1655 1.63 669 2.99
44 2023-11-04 9507 1.76 492 2.03 1085 3.87 5215 1.04 1931 2.12 784 2.55
45 2023-11-11 9618 1.46 467 2.57 1274 2.98 5242 0.92 1851 1.67 784 1.40
46 2023-11-18 10447 2.03 500 4.60 1439 4.31 5504 0.94 2185 1.92 819 4.03
47 2023-11-25 10270 1.91 620 2.74 1444 4.02 5703 1.07 1625 1.48 856 3.86

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 6260 0.34 362 0.00 848 1.42 3407 0.21 1008 0.10 635 0.16
36 2023-09-09 6354 0.38 355 0.28 867 1.38 3423 0.20 1164 0.17 545 0.37
37 2023-09-16 7455 0.39 401 0.50 1053 0.76 3886 0.36 1362 0.07 753 0.53
38 2023-09-23 8194 0.38 429 0.00 1124 1.07 4365 0.14 1500 0.13 776 1.42
39 2023-09-30 8679 0.51 401 0.25 1118 0.89 4948 0.36 1466 0.34 746 1.34
40 2023-10-07 8828 0.32 457 0.44 1180 0.76 4853 0.14 1583 0.32 755 0.66
41 2023-10-14 8911 0.37 484 0.00 1096 1.00 4915 0.20 1658 0.12 758 1.32
42 2023-10-21 9320 0.46 498 0.20 1050 1.33 5298 0.32 1741 0.17 733 1.09
43 2023-10-28 9082 0.46 474 0.63 1066 1.41 5200 0.31 1673 0.18 669 0.75
44 2023-11-04 9512 0.55 492 0.20 1070 1.96 5218 0.17 1948 0.62 784 1.15
45 2023-11-11 9602 0.61 467 0.21 1256 2.15 5244 0.21 1851 0.70 784 0.89
46 2023-11-18 10311 0.80 500 0.40 1428 2.38 5505 0.36 2174 0.37 704 2.56
47 2023-11-25 10286 1.05 620 0.97 1430 2.59 5707 0.44 1651 0.79 856 3.04

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 5345 12.50 362 20.72 - - 3409 10.44 966 14.60 608 15.79
36 2023-09-09 5414 14.85 355 25.35 - - 3423 12.80 1119 16.80 516 17.05
37 2023-09-16 6331 18.29 401 23.69 - - 3887 16.08 1314 22.37 722 19.81
38 2023-09-23 6991 20.25 429 27.51 - - 4365 17.11 1428 25.14 747 24.63
39 2023-09-30 7478 18.51 401 26.43 - - 4948 15.74 1397 22.12 715 25.31
40 2023-10-07 7559 17.45 467 23.55 - - 4853 14.77 1515 20.99 706 23.80
41 2023-10-14 7762 15.74 491 23.01 - - 4915 13.77 1612 16.00 717 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 8379 10.81 492 17.07 - - 5218 8.39 1910 12.15 736 20.52
45 2023-11-11 8308 10.70 467 16.70 - - 5244 8.68 1829 10.44 743 21.53
46 2023-11-18 8951 8.65 500 14.20 - - 5505 6.79 2155 8.45 779 18.87
47 2023-11-25 8797 7.42 620 11.94 - - 5707 5.87 1620 6.73 828 15.58

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 5054 0.28 362 0.00 847 0.47 2230 0.13 1007 0.60 608 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 6174 0.23 401 0.50 1053 0.47 2636 0.23 1362 0.00 722 0.14
38 2023-09-23 6796 0.46 429 0.00 1122 0.80 2995 0.40 1503 0.40 747 0.54
39 2023-09-30 7025 0.28 401 0.00 1117 0.45 3325 0.21 1467 0.48 715 0.14
40 2023-10-07 7305 0.26 467 0.21 1178 0.08 3390 0.18 1587 0.25 683 1.02
41 2023-10-14 7435 0.32 491 0.20 1094 0.73 3461 0.12 1672 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 7575 0.38 473 0.42 1065 0.38 3707 0.30 1693 0.53 637 0.47
44 2023-11-04 7747 0.37 476 0.21 1067 0.28 3508 0.43 1960 0.20 736 0.82
45 2023-11-11 7894 0.42 467 0.86 1187 0.51 3607 0.28 1890 0.37 743 0.81
46 2023-11-18 8669 0.65 500 0.20 1325 0.98 3838 0.42 2227 0.99 779 0.51
47 2023-11-25 8423 0.66 620 0.65 1343 0.97 3969 0.55 1663 0.54 828 0.97

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