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Respiratory Virus Report, Week 42 - ending October 21, 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 42 (week ending October 21, 2023) in Canada, participating RVDSS laboratories reported 6,975 detections of SARS-CoV-2 from 39,259 tests (17.8% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 6,410 to 22,389 tests), activity of enterovirus/rhinovirus is highest.

  • 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 enterovirus/rhinovirus is decreasing and remains below expected levels for this time of year (892 detections; 12.9% 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 October 21, 2023 (surveillance week 2023-42)
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 571 108 387 0 0 4 4 0 387 4 387 0 1 1 5 0 387 3 387 1 387 69 387 1
Prince Edward Island 278 39 117 0 0 1 1 0 117 0 10 0 0 0 0 0 10 0 10 0 10 6 10 0
Nova Scotia 1683 383 713 0 0 6 6 1 713 8 34 1 0 0 1 0 34 3 34 0 34 13 34 0
New Brunswick 961 158 812 3 0 0 3 0 798 2 67 0 1 0 1 0 67 0 67 0 67 22 67 0
Atlantic 3493 688 2029 3 0 11 14 1 2015 14 498 1 2 1 7 0 498 6 498 1 498 110 498 1
Région Nord-Est 1749 317 1311 0 0 4 4 0 285 11 59 2 1 0 0 0 59 0 59 4 N.C. N.C. 59 0
Québec-Chaudière-Appalaches 2084 369 589 0 0 1 1 0 589 30 244 0 1 0 1 0 252 17 244 2 N.C. N.C. 244 0
Centre-du-Québec 2222 435 478 0 0 2 2 1 475 22 36 3 0 0 0 0 36 3 36 1 N.C. N.C. 36 0
Montréal-Laval 3026 450 1307 0 0 5 5 0 1164 75 683 1 2 5 0 0 683 15 683 7 N.C. N.C. 683 5
Ouest du Québec 1951 457 609 0 0 5 5 0 608 21 12 0 0 0 0 0 12 3 12 0 N.C. N.C. 12 0
Montérégie 1556 316 813 0 0 2 2 0 765 27 13 0 0 0 0 0 13 0 13 0 N.C. N.C. 13 0
Province of Québec 12588 2344 5107 0 0 19 19 1 3886 186 1047 6 4 5 1 0 1055 38 1047 14 N.C. N.C. 1047 5
P.H.O.L. - Ottawa 407 145 234 8 0 0 8 0 234 2 149 0 0 0 0 9 149 0 149 1 149 27 149 0
EORLA 1491 202 534 0 0 3 3 3 534 61 34 0 0 1 0 0 34 0 34 1 34 9 34 1
P.H.O.L. - Kingston 250 72 162 0 0 0 0 0 162 1 122 0 0 0 0 3 122 1 122 0 122 21 122 0
UHN / Mount Sinai Hospital 959 98 619 0 0 3 3 1 619 4 27 0 0 1 0 0 27 0 27 0 27 1 27 0
P.H.O.L. - Toronto 594 213 1055 8 2 0 8 0 1055 17 931 0 0 0 0 29 931 16 931 6 931 171 931 0
Sick Kids Hospital - Toronto 120 6 112 0 0 0 0 0 112 11 112 4 1 1 0 0 112 3 112 0 112 39 112 0
Shared Hospital Laboratory 1447 124 1447 1 2 0 3 0 1447 61 1447 0 0 0 0 7 1446 6 1452 0 1452 66 1452 1
P.H.O.L. - Sault Ste. Marie 23 22 15 0 0 0 0 0 15 0 9 0 0 0 0 0 9 0 9 0 9 0 9 0
P.H.O.L. - Timmins 24 2 19 0 0 0 0 0 19 0 18 0 0 0 0 1 18 0 18 0 18 1 18 0
St. Joseph's - London 980 156 170 0 0 0 0 0 170 6 170 0 0 0 0 2 170 1 170 0 170 16 170 0
P.H.O.L. - London 549 165 373 0 2 0 2 0 373 2 276 0 0 0 0 2 276 0 276 0 276 29 276 0
P.H.O.L. - Orillia 23 6 55 0 0 0 0 0 55 2 54 0 0 0 0 3 54 2 54 0 54 18 54 0
P.H.O.L. - Thunder Bay 69 28 34 0 0 0 0 0 34 0 30 0 0 0 0 0 30 0 30 0 30 2 30 0
P.H.O.L. - Sudbury 19 5 24 0 0 0 0 0 24 0 23 0 0 0 0 0 23 0 23 0 23 8 23 0
P.H.O.L. - Hamilton 232 87 182 2 0 0 0 0 182 1 147 0 0 0 0 5 147 1 147 4 147 18 147 0
P.H.O.L. - Peterborough 76 23 98 0 0 0 0 0 98 18 77 0 0 0 0 4 77 1 77 0 77 7 77 0
St. Joseph's - Hamilton 1866 197 1591 0 0 5 5 1 1591 68 1591 0 0 6 0 0 1591 8 1591 5 1591 130 0 0
Sault Area Hospital 171 17 110 0 0 0 0 0 110 0 75 0 0 0 0 0 75 1 75 0 75 10 75 0
Province of Ontario 9300 1568 6834 19 6 11 32 5 6834 254 5292 4 1 9 0 65 5291 40 5297 17 5297 573 3706 2
Manitoba 1664 280 1347 0 0 7 7 0 1347 9 90 0 0 0 5 0 90 1 131 1 90 31 131 0
Saskatchewan 2531 404 963 0 0 10 10 0 928 1 402 0 1 0 1 0 402 12 402 1 402 54 402 0
Alberta 5759 1023 2660 29 5 1 35 4 2385 13 30 0 0 0 0 0 30 1 30 0 29 8 30 0
Prairies 9954 1707 4970 29 5 18 52 4 4660 23 522 0 1 0 6 0 522 14 563 2 521 93 563 0
British Columbia 3734 633 3324 18 0 0 36 4 3324 41 634 2 3 2 5 0 634 20 634 6 596 104 596 1
Yukon 36 5 28 0 0 0 0 0 28 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 37 6 32 0 0 0 0 0 32 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 32 12 N.C. N.C.
Nunavut 117 24 65 0 0 0 0 0 65 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 190 35 125 0 0 0 0 0 125 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 32 12 N.C. N.C.
CANADA 39259 6975 22389 69 11 59 153 15 20844 518 7993 13 11 17 19 65 8000 118 8039 40 6944 892 6410 9

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 21, 2023 (surveillance weeks 2023-35 to 2023-42)
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 4036 723 2573 0 0 5 5 0 2573 18 2573 2 6 4 31 0 2573 31 2573 6 2573 546 2573 6
Prince Edward Island 1506 182 270 0 0 2 2 0 270 0 65 0 0 0 2 0 64 4 54 0 64 35 64 0
Nova Scotia 11355 2920 4359 0 0 19 19 1 4359 36 300 12 1 1 3 0 300 14 293 1 300 102 300 0
New Brunswick 6647 998 4578 4 0 5 9 1 4491 19 467 6 2 0 3 0 467 7 467 0 467 134 467 1
Atlantic 23544 4823 11780 4 0 31 35 2 11693 73 3405 20 9 5 39 0 3404 56 3387 7 3404 817 3404 7
Région Nord-Est 12893 2362 8907 0 0 12 12 1 1967 45 467 8 4 2 13 0 467 12 465 10 N.C. N.C. 467 0
Québec-Chaudière-Appalaches 17708 3216 4222 0 0 15 15 2 4222 126 1898 8 2 1 6 0 1997 93 1898 21 N.C. N.C. 1898 2
Centre-du-Québec 17207 3586 2919 0 0 6 6 4 2910 89 232 9 2 2 3 0 232 10 232 4 N.C. N.C. 232 1
Montréal-Laval 26299 4311 10210 0 0 42 42 3 9225 260 5532 54 19 20 15 0 5532 89 5541 50 N.C. N.C. 5532 40
Ouest du Québec 14639 3670 3904 1 0 19 20 4 3898 103 144 5 3 1 4 0 144 10 144 3 N.C. N.C. 144 1
Montérégie 12262 2443 6294 0 0 12 12 5 5805 126 53 1 0 0 1 0 53 0 53 0 N.C. N.C. 53 0
Province of Québec 101008 19588 36456 1 0 106 107 19 28027 749 8326 85 30 26 42 0 8425 214 8333 88 N.C. N.C. 8326 44
P.H.O.L. - Ottawa 3214 1166 1758 9 0 1 10 0 1758 10 1041 0 0 0 0 17 1041 0 1041 1 1041 206 1041 0
EORLA 9695 1072 3322 0 0 10 10 4 3322 197 239 0 3 2 1 0 214 1 239 1 239 64 239 1
P.H.O.L. - Kingston 2245 610 982 0 0 0 0 0 982 2 756 0 0 0 0 22 756 2 756 0 756 172 756 1
UHN / Mount Sinai Hospital 7783 611 4353 0 0 7 7 5 4353 15 178 0 0 3 0 0 178 1 178 0 178 12 178 0
P.H.O.L. - Toronto 4669 1524 7145 52 21 2 53 0 7145 54 6472 0 0 0 0 200 6473 67 6469 27 6472 1459 6469 18
Sick Kids Hospital - Toronto 843 56 748 9 6 6 21 1 748 48 748 8 3 4 4 0 748 17 748 4 748 104 748 4
Shared Hospital Laboratory 9113 914 9113 9 14 0 23 2 9114 209 9112 0 0 0 0 74 9110 64 9126 8 9126 654 9126 13
P.H.O.L. - Sault Ste. Marie 115 87 115 0 0 0 0 0 115 0 60 0 0 0 0 0 60 0 60 0 60 12 60 0
P.H.O.L. - Timmins 202 34 162 0 0 0 0 0 162 2 146 0 0 0 0 9 146 2 146 0 146 19 146 0
St. Joseph's - London 6219 852 552 0 0 0 0 0 552 14 528 0 0 0 0 8 545 4 545 0 545 92 546 1
P.H.O.L. - London 3795 1209 2548 0 2 0 2 1 2548 15 2012 0 0 0 0 44 2012 10 2012 0 2012 369 2012 0
P.H.O.L. - Orillia 147 19 300 1 1 0 2 0 299 5 286 0 0 0 0 8 286 6 286 2 286 81 286 0
P.H.O.L. - Thunder Bay 497 190 261 0 0 0 0 0 261 0 205 0 0 0 0 5 205 1 205 1 205 34 205 1
P.H.O.L. - Sudbury 134 46 154 0 0 0 0 0 152 0 117 0 0 0 0 1 118 1 117 0 117 32 117 0
P.H.O.L. - Hamilton 2091 609 1586 3 1 0 1 0 1586 16 1124 0 0 0 0 39 1124 12 1124 11 1124 281 1124 1
P.H.O.L. - Peterborough 595 194 521 0 0 0 0 1 521 43 453 0 0 0 0 13 453 5 453 1 453 123 453 2
St. Joseph's - Hamilton 13158 1425 11077 0 0 22 22 9 11077 199 11077 0 0 30 0 0 11077 65 11077 30 11077 1097 0 0
Sault Area Hospital 871 101 638 0 1 0 1 0 631 2 512 0 0 2 0 0 512 6 512 0 512 101 522 0
Province of Ontario 65386 10719 45335 83 46 48 152 23 45326 831 35066 8 6 41 5 440 35058 264 35094 86 35097 4912 24028 42
Manitoba 11745 1987 9156 0 1 22 23 5 9156 27 524 0 4 4 18 0 524 28 853 1 524 231 853 3
Saskatchewan 13940 1707 6071 0 0 26 26 3 5911 27 2489 3 5 0 6 0 2489 73 2468 16 2439 520 2489 7
Alberta 37761 5669 22922 156 27 7 190 15 21118 83 5203 13 15 5 3 0 5203 51 5187 0 5114 942 5203 24
Prairies 63446 9363 38149 156 28 55 239 23 36185 137 8216 16 24 9 27 0 8216 152 8508 17 8077 1693 8545 34
British Columbia 27658 5522 24534 216 37 14 337 12 24517 167 5602 22 18 15 48 0 5602 129 5602 49 5327 1130 5304 18
Yukon 465 61 254 0 1 0 2 0 254 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 160 24 124 0 0 0 0 0 124 0 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 124 44 N.C. N.C.
Nunavut 698 100 467 0 0 0 0 0 467 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 1323 185 845 0 1 0 2 0 845 1 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 124 44 N.C. N.C.
CANADA 282365 50200 157099 460 112 254 872 79 146593 1958 60615 151 87 96 161 440 60705 815 60924 247 52029 8596 49607 145

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 17.56 16.59 0.48 1.42 0.03 2.66 1.05 1.56 0.03 0.01 0.03 0.36 0.03 0.16 1.84 3.65 9.54 1.74 0.58 1.03
42 2023-10-21 17.77 15.39 0.68 2.36 0.03 2.96 0.77 1.92 0.07 0.05 0.02 0.45 0.05 0.25 2.49 4.63 8.18 2.11 0.63 1.25
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 16.14 16.70 22.91 33.62 26.94 29.93 1.30 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 0.27 0.99 1.69 0.70 0.00 0.34
42 2023-10-21 12.85 12.95 22.16 32.62 24.54 27.86 1.56 4.22 10.01 3.89 2.64 3.21 1.48 1.65 2.54 2.39 1.47 1.86 0.50 1.58 0.15 0.89 0.15 0.40 0.14 1.16 1.07 1.18 0.20 0.49

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

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 22106 0.48 0.03 1938 0.57 0.00 4978 0.22 0.06 6283 0.30 0.00 4965 0.75 0.04 3828 0.73 0.03 114 0.00 0.00
42 2023-10-21 22389 0.68 0.07 2029 0.69 0.05 5107 0.37 0.02 6834 0.47 0.07 4970 1.05 0.08 3324 1.08 0.12 125 0.00 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 20644 1.84 1927 0.83 3897 3.70 6281 2.48 4597 0.52 3828 1.04 114 0.00
42 2023-10-21 20844 2.49 2015 0.69 3886 4.79 6834 3.72 4660 0.49 3324 1.23 125 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 7745 1.30 491 1.63 1094 1.37 4898 1.16 504 0.79 758 2.24
42 2023-10-21 7993 1.56 498 2.21 1047 1.53 5292 1.49 522 1.34 634 1.89

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 7779 1.38 491 1.63 1111 3.42 4915 0.75 504 1.59 758 2.11
42 2023-10-21 8000 1.48 498 1.20 1055 3.60 5291 0.76 522 2.68 634 3.15

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 7791 0.42 484 0.00 1096 1.00 4915 0.20 538 0.37 758 1.32
42 2023-10-21 8039 0.50 498 0.20 1047 1.34 5297 0.32 563 0.36 634 0.95

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 6653 16.14 491 23.01 - - 4915 13.77 503 21.87 717 23.15
42 2023-10-21 6944 12.85 498 22.09 - - 5297 10.82 521 17.85 596 17.45

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 6301 0.27 491 0.20 1094 0.73 3461 0.12 538 0.56 717 0.14
42 2023-10-21 6410 0.14 498 0.20 1047 0.48 3706 0.05 563 0.00 596 0.17

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