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Respiratory Virus Report, Week 48 - ending December 2, 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 48 (week ending December 2, 2023) in Canada, participating RVDSS laboratories reported 7,876 detections of SARS-CoV-2 from 43,385 tests (18.2% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 9,109 to 31,048 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 increased slightly, but trends vary by region.
  • At the national level, activity of influenza is increasing, but is within expected levels for this time of year (3,077 detections; 9.9% 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 (2,032 detections; 7.1% 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 December 2, 2023 (surveillance week 2023-48)
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 749 173 524 0 0 28 28 1 524 27 524 0 6 1 4 0 524 13 524 6 524 34 524 2
Prince Edward Island 229 76 163 0 0 2 2 0 163 5 13 0 0 0 0 0 13 1 13 0 13 3 13 1
Nova Scotia 1476 397 1014 0 0 24 24 2 828 81 33 0 0 0 1 0 33 1 33 0 33 7 33 0
New Brunswick 1081 156 1042 27 0 53 80 0 1034 37 106 1 1 0 2 0 106 7 106 0 106 22 106 2
Atlantic 3535 802 2743 27 0 107 134 3 2549 150 676 1 7 1 7 0 676 22 676 6 676 66 676 5
Région Nord-Est 1492 300 1295 0 0 47 47 0 422 41 64 1 1 1 0 0 64 6 61 6 N.C. N.C. 64 2
Québec-Chaudière-Appalaches 2414 540 1178 0 0 25 25 3 1179 130 577 1 1 1 0 0 598 31 577 16 N.C. N.C. 496 7
Centre-du-Québec 2762 538 1155 0 0 51 51 1 798 122 59 0 0 0 1 0 59 3 59 4 N.C. N.C. 67 0
Montréal-Laval 3750 841 1989 0 0 82 82 2 1583 183 865 5 3 5 1 0 865 17 866 10 N.C. N.C. 865 7
Ouest du Québec 1783 483 432 0 0 16 16 3 431 56 17 0 0 0 0 0 17 3 17 1 N.C. N.C. 17 0
Montérégie 1652 354 1178 0 0 53 53 2 1141 102 11 0 0 0 0 0 11 1 11 0 N.C. N.C. 11 0
Province of Québec 13853 3056 7227 0 0 274 274 11 5554 634 1593 7 5 7 2 0 1614 61 1591 37 N.C. N.C. 1520 16
P.H.O.L. - Ottawa 370 178 243 13 1 1 10 0 243 15 152 0 0 0 0 3 152 1 152 2 152 4 152 0
EORLA 1744 259 762 0 0 77 77 1 762 87 40 0 0 0 0 0 40 0 40 0 40 5 40 0
P.H.O.L. - Kingston 239 107 147 1 0 0 1 0 147 24 116 0 0 0 0 2 116 2 116 0 116 16 116 0
UHN / Mount Sinai Hospital 1428 203 765 13 0 0 13 2 765 16 21 0 0 0 0 0 21 0 21 0 21 0 21 0
P.H.O.L. - Toronto 733 280 1248 50 20 0 60 3 1248 97 1136 0 0 0 0 40 1136 21 1136 8 1136 76 1136 8
Sick Kids Hospital - Toronto 147 18 134 4 5 9 18 0 134 27 134 0 0 2 2 0 134 2 134 1 134 19 134 1
Shared Hospital Laboratory 2214 301 1791 39 20 11 70 5 1792 116 1787 0 0 0 0 6 1787 22 1790 4 1790 31 1790 6
P.H.O.L. - Sault Ste. Marie 5 3 5 0 0 0 0 0 5 0 5 0 0 0 0 0 5 0 5 0 5 1 5 0
P.H.O.L. - Timmins 19 1 26 1 0 0 1 0 26 7 22 0 0 0 0 0 22 0 22 0 22 1 22 0
St. Joseph's - London 951 204 580 0 0 28 28 0 580 64 51 0 0 0 0 1 51 2 51 0 51 6 51 0
P.H.O.L. - London 576 202 448 29 3 7 20 1 447 47 366 0 0 0 0 7 366 3 366 2 366 9 366 2
P.H.O.L. - Orillia 16 8 45 0 0 0 0 0 45 8 42 0 0 0 0 0 42 0 42 0 42 2 42 0
P.H.O.L. - Thunder Bay 48 15 23 1 0 0 1 0 23 0 22 0 0 0 0 2 22 1 22 1 22 2 22 0
P.H.O.L. - Sudbury 36 20 41 0 0 0 0 0 41 0 23 0 0 0 0 0 23 0 23 0 23 0 23 0
P.H.O.L. - Hamilton 249 83 170 1 0 0 1 0 170 21 122 0 0 0 0 2 122 4 122 2 122 10 122 1
P.H.O.L. - Peterborough 140 51 129 5 3 0 8 0 129 27 93 0 0 0 0 3 93 5 93 2 93 11 93 0
St. Joseph's - Hamilton 1966 259 1724 0 0 76 76 2 1724 155 1724 0 0 9 0 0 1724 15 1724 6 1724 105 0 0
Sault Area Hospital 304 48 173 4 0 4 8 0 173 7 117 3 0 0 1 0 117 3 117 0 117 12 117 0
Province of Ontario 11185 2240 8454 161 52 213 392 14 8454 718 5973 3 0 11 3 66 5973 81 5976 28 5976 310 4252 18
Manitoba 1845 314 1436 0 9 137 146 2 1436 35 109 0 0 1 4 0 109 11 132 1 109 19 132 2
Saskatchewan 2912 327 2483 0 0 806 806 9 2268 58 549 3 0 0 0 0 549 12 549 8 549 29 549 3
Alberta 6170 747 4881 729 30 71 830 21 4589 196 1170 5 5 2 0 0 1170 14 1156 0 1152 75 1170 7
Prairies 10927 1388 8800 729 39 1014 1782 32 8293 289 1828 8 5 3 4 0 1828 37 1837 9 1810 123 1851 12
British Columbia 3636 371 3675 85 21 4 384 8 3622 231 834 9 10 2 5 0 834 26 834 22 810 129 810 17
Yukon 45 2 32 1 0 0 3 0 32 1 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C.
Northwest Territories 43 3 36 11 0 0 11 0 36 3 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 36 3 N.C. N.C.
Nunavut 161 14 81 0 3 26 29 0 81 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 249 19 149 12 3 26 43 0 149 10 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 36 3 N.C. N.C.
CANADA 43385 7876 31048 1014 115 1638 3009 68 28621 2032 10904 28 27 24 21 66 10961 234 10950 103 9308 631 9109 68

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 December 2, 2023 (surveillance weeks 2023-35 to 2023-48)
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 7565 1487 5009 0 0 150 150 2 5009 97 5009 6 18 7 51 0 5009 93 5009 24 5009 781 5009 18
Prince Edward Island 2746 422 901 0 0 10 10 0 901 10 131 0 0 0 5 0 130 6 120 0 130 55 114 1
Nova Scotia 20038 5032 9233 0 0 92 92 8 8915 261 511 15 2 1 9 0 511 23 504 2 511 164 510 0
New Brunswick 12588 1888 10082 74 4 109 187 2 9907 152 983 7 3 0 18 0 983 31 983 0 983 266 983 5
Atlantic 42937 8829 25225 74 4 361 439 12 24732 520 6634 28 23 8 83 0 6633 153 6616 26 6633 1266 6616 24
Région Nord-Est 22563 4361 16707 0 0 98 98 1 4770 196 851 14 8 4 14 0 851 43 835 23 N.C. N.C. 851 3
Québec-Chaudière-Appalaches 30729 5709 9790 0 0 62 62 10 9798 643 4512 17 8 2 9 0 4711 212 4514 76 N.C. N.C. 4170 15
Centre-du-Québec 32324 6560 8359 0 0 119 119 8 6615 545 540 12 7 5 5 0 540 29 540 14 N.C. N.C. 554 2
Montréal-Laval 44128 7610 19535 0 0 213 213 11 17016 1060 9895 83 32 43 20 0 9895 205 9919 142 N.C. N.C. 9895 78
Ouest du Québec 24767 6237 7324 1 0 71 72 11 7305 424 295 9 3 2 5 0 295 22 295 4 N.C. N.C. 295 1
Montérégie 22189 4345 12110 0 0 160 160 13 11384 548 84 1 0 0 1 0 84 3 84 0 N.C. N.C. 84 0
Province of Québec 176700 34822 73825 1 0 723 724 54 56888 3416 16177 136 58 56 54 0 16376 514 16187 259 N.C. N.C. 15849 99
P.H.O.L. - Ottawa 5302 2039 3169 45 7 4 30 0 3168 61 1909 0 0 0 0 27 1909 3 1909 10 1909 308 1909 24
EORLA 18990 2434 7124 0 0 167 167 9 7124 742 453 2 3 2 3 0 428 4 453 1 453 113 453 2
P.H.O.L. - Kingston 3614 1199 1828 3 0 0 2 0 1828 67 1394 0 0 0 0 29 1394 8 1394 0 1394 263 1394 1
UHN / Mount Sinai Hospital 14900 1439 8577 34 0 14 48 15 8577 81 324 0 0 4 1 0 324 1 324 0 324 18 324 1
P.H.O.L. - Toronto 8882 3105 13869 241 93 14 273 7 13868 344 12510 0 0 0 0 360 12515 141 12506 70 12510 1986 12506 44
Sick Kids Hospital - Toronto 1718 126 1496 23 21 34 78 1 1496 204 1496 11 7 11 13 0 1496 37 1496 7 1496 305 1496 8
Shared Hospital Laboratory 19982 2241 18264 103 65 22 190 8 18267 830 18230 0 0 0 0 112 18228 150 18238 23 18265 970 18240 39
P.H.O.L. - Sault Ste. Marie 206 154 163 0 0 0 0 0 163 1 96 0 0 0 0 1 96 0 96 0 96 16 96 0
P.H.O.L. - Timmins 489 172 373 1 0 0 1 0 373 17 300 0 0 0 0 12 300 4 300 0 300 35 300 0
St. Joseph's - London 11428 1823 3104 0 0 49 49 4 3104 258 1069 0 0 0 0 13 1086 12 1086 1 1086 156 1086 4
P.H.O.L. - London 7287 2516 4879 57 14 8 41 2 4878 204 3835 0 0 0 0 81 3835 21 3835 4 3835 525 3835 3
P.H.O.L. - Orillia 252 63 597 3 1 0 4 0 596 40 580 0 0 0 0 16 580 11 580 3 580 123 580 0
P.H.O.L. - Thunder Bay 897 325 454 1 0 0 1 0 454 0 372 0 0 0 0 17 372 3 372 2 372 45 372 1
P.H.O.L. - Sudbury 338 177 326 0 0 0 0 0 324 1 222 0 0 0 0 4 223 1 222 0 222 36 222 0
P.H.O.L. - Hamilton 3656 1257 2898 15 1 0 8 1 2898 101 2084 0 0 0 0 56 2084 30 2084 17 2084 376 2084 4
P.H.O.L. - Peterborough 1085 407 1064 8 3 1 12 1 1064 159 919 0 0 0 0 26 919 19 919 4 919 201 919 3
St. Joseph's - Hamilton 24575 2792 21047 0 0 211 211 16 21047 988 21047 0 0 64 0 0 21047 137 21047 53 21047 1713 0 0
Sault Area Hospital 2265 329 1475 11 3 5 19 0 1468 12 1094 10 0 3 8 0 1094 14 1094 0 1094 155 1104 0
Province of Ontario 125866 22598 90707 545 208 529 1134 64 90697 4110 67934 23 10 84 25 754 67930 596 67955 195 67986 7344 46920 134
Manitoba 21855 4188 16919 1 15 355 371 7 16919 130 1070 0 5 6 38 0 1070 59 1607 6 1070 340 1607 7
Saskatchewan 31066 4220 17352 49 5 2902 2956 29 16452 201 5914 11 4 2 9 0 5914 161 5914 66 5914 826 5914 12
Alberta 74399 11285 52748 3161 209 191 3561 115 48982 919 15594 69 47 42 3 0 15591 181 15401 7 15307 2049 15593 93
Prairies 127320 19693 87019 3211 229 3448 6888 151 82353 1250 22578 80 56 50 50 0 22575 401 22922 79 22291 3215 23114 112
British Columbia 48384 8279 45320 708 145 42 1339 39 45177 984 10498 72 74 34 99 0 10502 278 10387 139 10014 2053 9991 62
Yukon 795 92 470 2 3 0 7 0 470 11 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 313 36 257 20 4 0 24 0 257 3 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 257 61 N.C. N.C.
Nunavut 1447 184 903 0 4 38 42 0 903 33 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 2555 312 1630 22 11 38 73 0 1630 47 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 257 61 N.C. N.C.
CANADA 523762 94533 323726 4561 597 5141 10597 320 301477 10327 123821 339 221 232 311 754 124074 1952 124125 700 107181 13939 102490 431

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 7.37 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 19.30 11.76 8.21 24.27 0.13 15.25 1.25 6.91 0.11 0.04 0.07 2.13 0.13 0.80 6.88 6.66 8.10 8.69 1.79 4.79
48 2023-12-02 18.15 12.12 9.69 24.04 0.19 18.07 0.76 9.40 0.22 0.03 0.15 3.18 0.08 1.20 7.10 6.87 8.92 9.47 3.11 6.08
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 7.54 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 1.02 1.78 1.01 2.02 0.09 0.90 0.67 3.24 3.90 3.26 0.37 1.25
48 2023-12-02 6.78 4.74 16.64 16.72 12.69 13.84 1.52 3.04 5.78 6.14 3.03 4.18 2.13 1.87 1.89 3.34 1.66 2.49 0.94 1.86 1.48 1.94 0.31 1.09 0.75 3.94 4.94 4.30 1.00 2.04

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 41432 18.80 3186 22.47 13182 20.21 10470 20.36 11134 16.80 3245 12.14 215 5.12
47 2023-11-25 42234 19.30 3490 22.35 12863 21.46 10882 22.17 11422 15.58 3388 11.98 189 6.35
48 2023-12-02 43385 18.15 3535 22.69 13853 22.06 11185 20.03 10927 12.70 3636 10.20 249 7.63

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 28577 7.37 0.16 2219 3.11 0.09 6454 1.36 0.09 7797 2.68 0.15 8728 18.56 0.26 3258 3.59 0.12 121 2.48 0.00
47 2023-11-25 29075 8.21 0.11 2521 4.60 0.04 6560 2.04 0.06 8071 2.76 0.02 8274 20.18 0.28 3517 6.43 0.09 132 12.88 0.00
48 2023-12-02 31048 9.69 0.22 2743 4.89 0.11 7227 3.79 0.15 8454 4.64 0.17 8800 20.25 0.36 3675 10.45 0.22 149 28.86 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 26512 5.85 2195 2.41 4910 10.14 7796 7.91 8232 2.87 3258 4.27 121 7.44
47 2023-11-25 26746 6.88 2363 4.70 4974 11.82 8069 8.66 7763 3.17 3445 5.28 132 11.36
48 2023-12-02 28621 7.10 2549 5.88 5554 11.42 8454 8.49 8293 3.48 3622 6.38 149 6.71

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 1426 1.33 5505 1.24 2186 0.87 819 3.42
47 2023-11-25 10617 1.56 620 1.77 1442 1.04 5709 1.47 1939 1.24 907 3.53
48 2023-12-02 10904 1.52 676 2.37 1593 1.32 5973 1.39 1828 1.09 834 3.12

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 1437 4.31 5505 0.94 2186 1.92 819 4.03
47 2023-11-25 10665 1.91 620 2.74 1461 3.97 5713 1.07 1938 1.55 911 3.84
48 2023-12-02 10961 2.13 676 3.25 1614 3.78 5973 1.36 1828 2.02 834 3.12

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 10310 0.80 500 0.40 1426 2.38 5505 0.36 2175 0.37 704 2.56
47 2023-11-25 10667 1.02 620 0.97 1442 2.57 5717 0.44 1955 0.66 911 2.96
48 2023-12-02 10950 0.94 676 0.89 1591 2.33 5976 0.47 1837 0.49 834 2.64

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 8953 8.65 500 14.20 - - 5506 6.79 2156 8.44 779 18.87
47 2023-11-25 9173 7.54 620 11.94 - - 5717 5.86 1931 7.20 883 15.63
48 2023-12-02 9308 6.78 676 9.76 - - 5976 5.19 1810 6.80 810 15.93

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 1324 0.98 3838 0.42 2228 0.99 779 0.51
47 2023-11-25 8815 0.67 620 0.65 1357 0.96 3979 0.55 1976 0.61 883 0.91
48 2023-12-02 9109 0.75 676 0.74 1520 1.05 4252 0.42 1851 0.65 810 2.10

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