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Respiratory Virus Report, Week 46 - ending November 18, 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 46 (week ending November 18, 2023) in Canada, participating RVDSS laboratories reported 7,772 detections of SARS-CoV-2 from 41,355 tests (18.8% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 7,997 to 27,368 tests), activity of both flu and RSV is increasing, as is expected at this time of year.

  • In recent weeks national SARS-CoV-2 percent positivity has remained relatively stable, but trends vary by region.
  • At the national level, activity of influenza is increasing, but is within expected levels for this time of year (1,849 detections; 6.8% positive). Influenza percent positivity currently varies greatly by region.
  • Activity of RSV continues to increase but is now within expected levels for this time of year (1,502 detections; 5.9% 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 18, 2023 (surveillance week 2023-46)
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 506 122 367 0 0 26 26 1 367 10 367 1 1 0 6 0 367 17 367 2 367 33 367 1
Prince Edward Island 185 31 94 0 0 1 1 0 94 0 7 0 0 0 1 0 7 1 7 0 7 2 7 0
Nova Scotia 1466 392 789 0 0 13 13 1 789 24 42 0 0 0 1 0 42 0 42 0 42 15 42 0
New Brunswick 1029 171 969 13 2 14 29 0 945 19 84 0 0 0 1 0 84 5 84 0 84 21 84 0
Atlantic 3186 716 2219 13 2 54 69 2 2195 53 500 1 1 0 9 0 500 23 500 2 500 71 500 1
Région Nord-Est 1679 354 1356 0 0 7 7 0 472 24 80 0 0 0 0 0 80 7 78 1 N.C. N.C. 80 0
Québec-Chaudière-Appalaches 2301 473 768 0 0 5 5 1 768 85 297 2 2 0 0 0 305 19 297 6 N.C. N.C. 297 1
Centre-du-Québec 2573 486 901 0 0 17 17 1 556 95 55 0 0 1 0 0 55 3 55 2 N.C. N.C. 57 1
Montréal-Laval 3137 591 1603 0 0 24 24 2 1342 142 735 8 1 3 0 0 735 29 736 22 N.C. N.C. 735 11
Ouest du Québec 1698 445 634 0 0 15 15 2 630 59 35 1 0 1 0 0 35 2 35 0 N.C. N.C. 35 0
Montérégie 1797 315 931 0 0 20 20 0 888 72 3 0 0 0 0 0 3 0 3 0 N.C. N.C. 3 0
Province of Québec 13185 2664 6193 0 0 88 88 6 4656 477 1205 11 3 5 0 0 1213 60 1204 31 N.C. N.C. 1207 13
P.H.O.L. - Ottawa 326 130 231 6 1 2 3 0 231 11 146 0 0 0 0 3 146 1 146 4 146 12 146 2
EORLA 1747 288 669 0 0 33 33 4 699 92 33 2 0 0 2 0 33 2 33 0 33 10 33 1
P.H.O.L. - Kingston 253 106 145 0 0 0 0 0 145 13 132 0 0 0 0 1 132 0 132 0 132 18 132 0
UHN / Mount Sinai Hospital 1184 151 749 13 0 1 14 3 749 15 32 0 0 0 1 0 32 0 32 0 32 4 32 1
P.H.O.L. - Toronto 742 250 1212 56 18 8 68 1 1210 50 1076 0 0 0 0 22 1076 11 1076 10 1076 74 1076 7
Sick Kids Hospital - Toronto 158 8 136 3 4 5 12 0 136 34 136 0 1 1 1 0 136 4 136 0 136 33 136 0
Shared Hospital Laboratory 1969 287 1483 8 12 5 25 1 1483 132 1481 0 0 0 0 7 1481 13 1482 2 1482 53 1482 5
P.H.O.L. - Sault Ste. Marie 13 7 10 0 0 0 0 0 10 1 4 0 0 0 0 0 4 0 4 0 4 1 4 0
P.H.O.L. - Timmins 57 33 40 0 0 0 0 0 40 2 30 0 0 0 0 0 30 1 30 0 30 4 30 0
St. Joseph's - London 862 160 489 0 0 6 6 2 489 52 46 0 0 0 0 2 46 2 46 0 46 5 46 0
P.H.O.L. - London 523 211 346 7 6 1 5 0 346 18 253 0 0 0 0 3 253 0 253 0 253 24 253 0
P.H.O.L. - Orillia 17 8 47 0 0 0 0 0 47 5 47 0 0 0 0 0 47 0 47 0 47 4 47 0
P.H.O.L. - Thunder Bay 68 19 23 0 0 0 0 0 23 0 17 0 0 0 0 2 17 0 17 0 17 0 17 0
P.H.O.L. - Sudbury 26 14 19 0 0 0 0 0 19 1 19 0 0 0 0 2 19 0 19 0 19 1 19 0
P.H.O.L. - Hamilton 306 136 279 1 0 0 0 0 279 22 195 0 0 0 0 6 195 1 195 0 195 14 195 0
P.H.O.L. - Peterborough 70 27 112 0 0 0 0 0 112 26 95 0 0 0 0 0 95 1 95 0 95 11 95 0
St. Joseph's - Hamilton 1941 265 1667 0 0 42 42 1 1667 142 1667 0 0 8 0 0 1667 12 1667 4 1667 97 0 0
Sault Area Hospital 209 32 141 2 0 0 2 0 141 1 90 3 0 0 1 0 90 3 90 0 90 9 90 0
Province of Ontario 10471 2132 7798 96 41 103 210 12 7826 617 5499 5 1 9 5 48 5499 51 5500 20 5500 374 3833 16
Manitoba 1771 443 1386 0 0 77 77 0 1386 11 85 0 0 0 1 0 85 5 127 1 85 16 127 0
Saskatchewan 3009 411 1915 0 0 590 590 4 1780 28 596 1 0 1 0 0 596 16 596 5 596 45 596 0
Alberta 6281 1012 4604 590 22 51 663 11 4355 178 1070 6 0 7 0 0 1070 10 1021 0 1046 92 1070 14
Prairies 11061 1866 7905 590 22 718 1330 15 7521 217 1751 7 0 8 1 0 1751 31 1744 6 1727 153 1793 14
British Columbia 3237 383 3132 39 14 5 111 3 3132 129 704 10 7 3 5 0 704 32 704 17 664 127 664 4
Yukon 67 4 36 0 0 0 1 0 36 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 22 1 12 0 2 0 2 0 12 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 12 0 N.C. N.C.
Nunavut 126 6 73 0 0 0 0 0 73 6 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 215 11 121 0 2 0 3 0 121 9 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 12 0 N.C. N.C.
CANADA 41355 7772 27368 738 81 968 1811 38 25451 1502 9659 34 12 25 20 48 9667 197 9652 76 8403 725 7997 48

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 18, 2023 (surveillance weeks 2023-35 to 2023-46)
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 6114 1146 4003 0 0 79 79 1 4003 48 4003 5 11 6 42 0 4003 70 4003 13 4003 706 4003 14
Prince Edward Island 2261 291 621 0 0 7 7 0 621 3 107 0 0 0 4 0 106 5 96 0 106 49 90 0
Nova Scotia 17048 4242 7266 0 0 52 52 6 7266 130 454 14 2 1 8 0 454 22 447 1 454 150 453 0
New Brunswick 10489 1568 8071 27 4 20 51 1 7930 78 774 6 2 0 14 0 774 17 774 0 774 221 774 1
Atlantic 35912 7247 19961 27 4 158 189 8 19820 259 5338 25 15 7 68 0 5337 114 5320 14 5337 1126 5320 15
Région Nord-Est 19527 3750 14129 0 0 28 28 1 3913 115 731 11 7 2 14 0 731 30 723 14 N.C. N.C. 731 1
Québec-Chaudière-Appalaches 26144 4707 7039 0 0 27 27 7 7046 358 2993 14 6 1 9 0 3151 153 2993 44 N.C. N.C. 2993 3
Centre-du-Québec 26979 5509 6301 0 0 41 41 5 5271 338 433 11 7 5 3 0 433 21 433 8 N.C. N.C. 438 2
Montréal-Laval 37295 6119 15788 0 0 94 94 8 14036 691 8242 76 26 36 19 0 8242 167 8261 111 N.C. N.C. 8242 62
Ouest du Québec 21360 5304 6396 1 0 45 46 8 6379 299 265 9 3 2 5 0 265 18 265 3 N.C. N.C. 265 1
Montérégie 18681 3616 9904 0 0 78 78 10 9239 358 64 1 0 0 1 0 64 1 64 0 N.C. N.C. 64 0
Province of Québec 149986 29005 59557 1 0 313 314 39 45884 2159 12728 122 49 46 51 0 12886 390 12739 180 N.C. N.C. 12733 69
P.H.O.L. - Ottawa 4580 1696 2720 16 2 3 15 0 2720 38 1632 0 0 0 0 24 1632 2 1632 8 1632 296 1632 21
EORLA 15815 1920 5672 0 0 59 59 8 5702 539 387 2 3 2 3 0 362 4 387 1 387 101 387 2
P.H.O.L. - Kingston 3158 984 1528 1 0 0 0 0 1528 29 1181 0 0 0 0 26 1181 5 1181 0 1181 237 1181 1
UHN / Mount Sinai Hospital 12126 1042 7085 13 0 14 27 12 7085 48 273 0 0 4 1 0 273 1 273 0 273 17 273 1
P.H.O.L. - Toronto 7308 2470 11436 152 50 11 162 4 11434 188 10314 0 0 0 0 287 10315 103 10311 54 10314 1841 10311 29
Sick Kids Hospital - Toronto 1446 93 1237 16 14 20 50 1 1237 153 1237 11 6 9 7 0 1237 33 1237 6 1237 250 1237 4
Shared Hospital Laboratory 15639 1680 14816 39 30 7 76 3 14819 585 14801 0 0 0 0 95 14799 111 14798 14 14825 884 14800 27
P.H.O.L. - Sault Ste. Marie 188 142 145 0 0 0 0 0 145 1 81 0 0 0 0 1 81 0 81 0 81 15 81 0
P.H.O.L. - Timmins 444 166 326 0 0 0 0 0 326 5 264 0 0 0 0 12 264 4 264 0 264 34 264 0
St. Joseph's - London 9580 1444 2026 0 0 12 12 3 2026 133 980 0 0 0 0 12 997 8 997 1 997 147 997 4
P.H.O.L. - London 6028 2035 3978 15 10 1 13 1 3978 102 3114 0 0 0 0 66 3114 15 3114 0 3114 495 3114 0
P.H.O.L. - Orillia 228 53 524 2 1 0 3 0 523 29 510 0 0 0 0 15 510 11 510 2 510 120 510 0
P.H.O.L. - Thunder Bay 762 282 381 0 0 0 0 0 381 0 297 0 0 0 0 9 297 1 297 1 297 42 297 1
P.H.O.L. - Sudbury 270 130 254 0 0 0 0 0 252 1 188 0 0 0 0 4 189 1 188 0 188 34 188 0
P.H.O.L. - Hamilton 3050 994 2447 10 1 0 5 1 2447 60 1785 0 0 0 0 50 1785 24 1785 14 1785 350 1785 2
P.H.O.L. - Peterborough 853 320 860 0 0 1 1 1 860 113 751 0 0 0 0 17 751 13 751 2 751 180 751 2
St. Joseph's - Hamilton 20591 2264 17585 0 0 91 91 14 17585 664 17585 0 0 50 0 0 17585 106 17585 39 17585 1524 0 0
Sault Area Hospital 1734 231 1163 4 1 1 6 0 1156 5 866 5 0 2 6 0 866 11 866 0 866 132 876 0
Province of Ontario 103800 17946 74183 268 109 220 520 48 74204 2693 56246 18 9 67 17 618 56238 453 56257 142 56287 6699 38684 94
Manitoba 18253 3463 14115 0 3 138 141 5 14115 67 855 0 5 4 28 0 855 46 1332 4 855 309 1332 4
Saskatchewan 25171 3445 12247 23 4 1355 1382 14 11727 107 4585 8 4 2 8 0 4585 131 4585 48 4585 757 4585 8
Alberta 61473 9614 42639 1393 132 95 1620 69 39626 523 12935 56 38 33 3 0 12933 146 12781 3 12680 1857 12934 68
Prairies 104897 16522 69001 1416 139 1588 3143 88 65468 697 18375 64 47 39 39 0 18373 323 18698 55 18120 2923 18851 80
British Columbia 41357 7491 38002 451 80 27 723 27 37984 561 8642 54 50 29 85 0 8642 216 8642 89 8206 1766 8183 37
Yukon 686 87 396 0 1 0 3 0 396 8 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 248 32 199 5 4 0 9 0 199 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 199 52 N.C. N.C.
Nunavut 1183 162 754 0 1 0 1 0 754 14 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 2117 281 1349 5 6 0 13 0 1349 22 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 199 52 N.C. N.C.
CANADA 438069 78492 262053 2168 338 2306 4902 210 244709 6391 101329 283 170 188 260 618 101476 1496 101656 480 88149 12566 83771 295

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 3.26 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 4.81 16.19 0.07 9.83 1.18 4.19 0.14 0.04 0.06 0.97 0.22 0.44 5.15 7.68 7.03 4.43 1.29 2.71
46 2023-11-18 18.79 11.96 6.62 20.23 0.10 13.89 1.42 5.43 0.14 0.05 0.06 1.49 0.09 0.57 5.90 7.54 7.18 6.33 1.38 3.60
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 1.21 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 1.68 3.90 9.97 5.42 2.53 4.01 1.45 1.99 1.63 2.68 2.02 2.42 0.61 2.06 0.64 1.30 0.04 0.77 0.41 3.00 2.57 2.74 0.52 0.96
46 2023-11-18 8.63 6.93 21.37 22.77 15.28 19.24 1.44 3.97 8.29 5.72 1.62 4.14 2.04 1.87 2.51 2.90 1.99 2.52 0.79 1.89 0.99 1.43 0.18 0.81 0.60 3.54 2.99 3.32 0.46 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 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 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 38725 18.17 3122 20.12 11814 19.90 9607 18.24 10447 16.99 3550 14.39 185 10.81
46 2023-11-18 41355 18.79 3186 22.47 13185 20.20 10471 20.36 11061 16.87 3237 11.83 215 5.12

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 23241 1.17 0.10 1979 0.96 0.00 5450 0.64 0.11 6814 0.50 0.06 5845 2.36 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 25616 4.81 0.14 2069 2.03 0.14 5750 0.83 0.07 7240 1.22 0.07 6972 13.10 0.29 3460 3.96 0.14 125 3.20 0.00
46 2023-11-18 27368 6.62 0.14 2219 3.11 0.09 6193 1.42 0.10 7798 2.69 0.15 7905 16.82 0.19 3132 3.54 0.10 121 2.48 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 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 21719 3.26 1970 1.78 4234 6.24 6814 4.21 5548 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 23913 5.15 2058 2.77 4458 8.05 7241 7.62 6572 2.01 3459 3.58 125 6.40
46 2023-11-18 25451 5.90 2195 2.41 4656 10.24 7826 7.88 7521 2.89 3132 4.12 121 7.44

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 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 9408 1.68 467 2.78 1064 2.16 5242 1.11 1851 1.30 784 5.10
46 2023-11-18 9659 1.44 500 2.20 1205 1.58 5499 1.24 1751 0.91 704 3.55

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 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 9427 1.45 467 2.57 1083 3.23 5242 0.92 1851 1.67 784 1.40
46 2023-11-18 9667 2.04 500 4.60 1213 4.95 5499 0.93 1751 1.77 704 4.55

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 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 9409 0.61 467 0.21 1063 2.35 5244 0.21 1851 0.70 784 0.89
46 2023-11-18 9652 0.79 500 0.40 1204 2.57 5500 0.36 1744 0.34 704 2.41

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 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 8403 8.63 500 14.20 - - 5500 6.80 1727 8.86 664 19.13

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 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 7772 0.41 467 0.86 1065 0.47 3607 0.28 1890 0.37 743 0.81
46 2023-11-18 7997 0.60 500 0.20 1207 1.08 3833 0.42 1793 0.78 664 0.60

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