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Respiratory Virus Report, Week 49 - ending December 9, 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 49 (week ending December 9, 2023) in Canada, participating RVDSS laboratories reported 8,112 detections of SARS-CoV-2 from 46,500 tests (17.5% positive). Among non-SARS-CoV-2 respiratory viruses, where test volumes are lower (range of 8,664 to 32,760 tests), activity of both flu and RSV is increasing, as is expected at this time of year.

  • Following a short period of increase, SARS-CoV-2 national percent positivity in week 49 was slightly lower than the previous 2 weeks. Trends currently vary by region.
  • At the national level, activity of influenza is increasing, but is within expected levels for this time of year (4,635 detections; 14.2% 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 (2,223 detections; 7.5% 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 9, 2023 (surveillance week 2023-49)
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 715 138 523 0 0 49 49 2 523 40 523 0 3 2 4 0 523 15 523 8 523 27 523 3
Prince Edward Island 238 50 115 0 0 4 4 0 115 8 19 0 0 0 0 0 19 0 19 0 19 5 19 0
Nova Scotia 1442 354 983 0 0 48 48 1 864 90 17 0 0 0 0 0 17 1 17 0 17 2 17 0
New Brunswick 1259 195 1196 87 1 83 171 0 1163 67 109 0 1 0 1 0 109 3 109 0 109 11 109 5
Atlantic 3654 737 2817 87 1 184 272 3 2665 205 668 0 4 2 5 0 668 19 668 8 668 45 668 8
Région Nord-Est 1920 347 1739 0 0 143 143 1 668 82 121 0 1 1 0 0 121 11 119 4 N.C. N.C. 121 3
Québec-Chaudière-Appalaches 2239 464 1199 0 0 68 68 3 1162 116 557 0 0 2 0 0 576 27 556 12 N.C. N.C. 445 3
Centre-du-Québec 2933 706 1130 0 0 83 83 0 774 123 51 0 1 1 1 0 51 2 51 2 N.C. N.C. 52 3
Montréal-Laval 3725 845 2237 0 0 145 145 3 1564 170 858 2 2 5 1 0 858 19 866 21 N.C. N.C. 858 15
Ouest du Québec 1844 503 457 1 0 35 36 0 454 66 23 0 0 0 1 0 23 2 23 1 N.C. N.C. 23 0
Montérégie 1488 323 1368 0 0 106 106 3 1305 96 11 0 0 0 0 0 11 0 11 0 N.C. N.C. 11 0
Province of Québec 14149 3188 8130 1 0 580 581 10 5927 653 1621 2 4 9 3 0 1640 61 1626 40 N.C. N.C. 1510 24
P.H.O.L. - Ottawa 396 144 276 28 1 3 21 1 276 9 153 0 0 0 0 3 153 0 153 3 153 8 153 0
EORLA 1740 278 784 0 0 101 101 2 784 71 41 0 0 0 0 0 41 0 41 0 41 7 41 1
P.H.O.L. - Kingston 225 85 116 2 0 0 2 0 116 17 90 0 0 0 0 1 90 0 90 0 90 4 90 0
UHN / Mount Sinai Hospital 1462 156 659 3 1 30 34 1 659 21 48 0 0 0 0 0 48 0 48 0 48 0 48 0
P.H.O.L. - Toronto 573 165 1046 49 46 5 53 1 1046 74 976 0 0 0 0 32 977 12 976 14 976 60 976 9
Sick Kids Hospital - Toronto 176 19 137 8 4 0 12 0 137 21 137 2 0 1 0 0 137 4 137 3 137 22 137 1
Shared Hospital Laboratory 2239 320 1743 40 38 14 92 6 1742 103 1722 0 0 0 0 8 1722 16 1728 3 1728 31 1728 7
P.H.O.L. - Sault Ste. Marie 3 2 8 0 0 0 0 0 8 0 8 0 0 0 0 0 8 1 8 0 8 0 8 0
P.H.O.L. - Timmins 47 12 44 3 1 0 4 0 44 8 35 0 0 0 0 1 35 0 35 0 35 1 35 0
St. Joseph's - London 1100 206 637 0 0 33 33 0 637 73 56 0 0 0 0 0 56 1 56 0 56 5 56 0
P.H.O.L. - London 586 224 402 34 1 0 21 1 402 41 319 0 0 0 0 9 319 3 319 1 319 17 319 0
P.H.O.L. - Orillia 41 25 71 1 0 0 1 0 71 8 57 0 0 0 0 1 57 1 57 0 57 3 57 0
P.H.O.L. - Thunder Bay 55 23 23 5 0 1 6 0 23 2 17 0 0 0 0 2 17 0 17 1 17 0 17 0
P.H.O.L. - Sudbury 33 16 46 4 0 0 4 0 46 0 21 0 0 0 0 0 21 0 21 0 21 0 21 0
P.H.O.L. - Hamilton 325 110 230 5 13 9 18 1 230 11 165 0 0 0 0 6 165 5 165 2 165 17 165 5
P.H.O.L. - Peterborough 99 32 85 6 4 0 5 1 85 17 59 0 0 0 0 2 59 3 59 0 59 7 59 0
St. Joseph's - Hamilton 2307 316 2030 0 0 173 173 4 2030 149 2030 0 0 12 0 0 2030 21 2030 10 2030 86 0 0
Sault Area Hospital 241 41 125 12 0 3 15 0 125 1 97 3 0 0 3 0 97 3 97 0 97 4 97 0
Province of Ontario 11648 2174 8462 200 109 372 595 18 8461 626 6031 5 0 13 3 65 6032 70 6037 37 6037 272 4007 23
Manitoba 2055 320 1407 0 14 248 262 2 1407 44 109 0 0 0 1 0 109 7 119 10 109 8 119 3
Saskatchewan 2876 363 2641 0 0 811 811 19 2302 65 532 3 0 1 2 0 532 4 532 28 532 21 532 3
Alberta 7459 860 5452 1051 39 56 1458 32 5089 288 1133 2 4 9 0 0 1133 15 1114 1 1125 71 1133 20
Prairies 12390 1543 9500 1051 53 1115 2531 53 8798 397 1774 5 4 10 3 0 1774 26 1765 39 1766 100 1784 26
British Columbia 4272 440 3590 87 12 4 471 4 3475 325 746 1 6 4 5 0 746 27 746 7 695 123 695 16
Yukon 55 4 41 0 0 0 6 0 41 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 56 4 55 23 0 0 23 0 55 4 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 55 3 N.C. N.C.
Nunavut 276 22 165 0 3 65 68 0 165 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.
Territories 387 30 261 23 3 65 97 0 261 17 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 55 3 N.C. N.C.
CANADA 46500 8112 32760 1449 178 2320 4547 88 29587 2223 10840 13 18 38 19 65 10915 206 10897 131 9221 543 8664 97

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 9, 2023 (surveillance weeks 2023-35 to 2023-49)
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 8280 1625 5532 0 0 199 199 4 5532 137 5532 6 21 9 55 0 5532 108 5532 32 5532 808 5532 21
Prince Edward Island 3097 472 1016 0 0 14 14 0 1016 18 150 0 0 0 5 0 149 6 139 0 149 60 133 1
Nova Scotia 21480 5386 10216 0 0 140 140 9 9779 351 528 15 2 1 9 0 528 24 521 2 528 166 527 0
New Brunswick 13847 2083 11278 161 5 192 358 2 11070 219 1092 7 4 0 19 0 1092 34 1092 0 1092 277 1092 10
Atlantic 46704 9566 28042 161 5 545 711 15 27397 725 7302 28 27 10 88 0 7301 172 7284 34 7301 1311 7284 32
Région Nord-Est 24490 4715 18446 0 0 241 241 2 5438 278 972 14 9 5 14 0 972 54 954 27 N.C. N.C. 972 6
Québec-Chaudière-Appalaches 32968 6173 10976 0 0 128 128 13 10947 759 5059 17 8 4 9 0 5282 240 5060 88 N.C. N.C. 4609 18
Centre-du-Québec 35257 7266 9485 0 0 202 202 8 7385 668 591 12 8 6 6 0 591 31 591 16 N.C. N.C. 606 5
Montréal-Laval 47949 8478 21769 0 0 358 358 14 18584 1230 10757 85 34 48 21 0 10757 224 10789 163 N.C. N.C. 10757 93
Ouest du Québec 26608 6739 7781 2 0 106 108 11 7759 490 318 9 3 2 6 0 318 24 318 5 N.C. N.C. 318 1
Montérégie 23677 4668 13471 0 0 266 266 16 12682 644 95 1 0 0 1 0 95 3 95 0 N.C. N.C. 95 0
Province of Québec 190949 38039 81928 2 0 1301 1303 64 62795 4069 17792 138 62 65 57 0 18015 576 17807 299 N.C. N.C. 17357 123
P.H.O.L. - Ottawa 5698 2183 3445 73 8 7 51 1 3444 70 2062 0 0 0 0 30 2062 3 2062 13 2062 316 2062 24
EORLA 20730 2712 7908 0 0 268 268 11 7908 813 494 2 3 2 3 0 469 4 494 1 494 120 494 3
P.H.O.L. - Kingston 3839 1284 1944 5 0 0 4 0 1944 84 1484 0 0 0 0 30 1484 8 1484 0 1484 267 1484 1
UHN / Mount Sinai Hospital 16362 1595 9236 37 1 44 82 16 9236 102 372 0 0 4 1 0 372 1 372 0 372 18 372 1
P.H.O.L. - Toronto 9455 3270 14915 290 140 19 327 8 14914 417 13486 0 0 0 0 392 13492 153 13481 84 13486 2046 13481 53
Sick Kids Hospital - Toronto 1894 145 1633 31 25 20 76 1 1633 225 1633 13 7 12 13 0 1633 41 1633 10 1633 327 1633 9
Shared Hospital Laboratory 22209 2561 19995 141 103 26 270 14 19997 933 19941 0 0 0 0 120 19939 166 19955 26 19982 1001 19957 46
P.H.O.L. - Sault Ste. Marie 209 156 171 0 0 0 0 0 171 1 104 0 0 0 0 1 104 1 104 0 104 16 104 0
P.H.O.L. - Timmins 536 184 417 4 1 0 5 0 417 25 335 0 0 0 0 13 335 4 335 0 335 36 335 0
St. Joseph's - London 12528 2029 3741 0 0 82 82 4 3741 331 1125 0 0 0 0 13 1142 13 1142 1 1142 161 1142 4
P.H.O.L. - London 7873 2740 5281 91 15 8 62 3 5280 245 4154 0 0 0 0 90 4154 24 4154 5 4154 542 4154 3
P.H.O.L. - Orillia 293 88 668 4 1 0 5 0 667 48 637 0 0 0 0 17 637 12 637 3 637 126 637 0
P.H.O.L. - Thunder Bay 952 348 477 6 0 1 7 0 477 2 389 0 0 0 0 19 389 3 389 3 389 45 389 1
P.H.O.L. - Sudbury 371 193 372 4 0 0 4 0 370 1 243 0 0 0 0 4 244 1 243 0 243 36 243 0
P.H.O.L. - Hamilton 3981 1367 3128 20 14 9 26 2 3128 112 2249 0 0 0 0 62 2249 35 2249 19 2249 393 2249 9
P.H.O.L. - Peterborough 1184 439 1149 14 7 1 17 2 1149 176 978 0 0 0 0 28 978 22 978 4 978 208 978 3
St. Joseph's - Hamilton 26882 3108 23077 0 0 384 384 20 23077 1137 23077 0 0 76 0 0 23077 158 23077 63 23077 1799 0 0
Sault Area Hospital 2506 371 1600 23 3 7 33 0 1593 13 1191 13 0 3 11 0 1191 17 1191 0 1191 159 1201 0
Province of Ontario 137502 24773 99157 743 318 876 1703 82 99146 4735 73954 28 10 97 28 819 73951 666 73980 232 74012 7616 50915 157
Manitoba 23910 4508 18326 1 29 603 633 9 18326 174 1179 0 5 6 39 0 1179 66 1726 16 1179 348 1726 10
Saskatchewan 33942 4583 20178 49 5 3809 3863 49 18936 269 6556 14 5 3 11 0 6556 168 6556 97 6556 848 6556 17
Alberta 82841 12257 58774 4491 255 239 5551 154 54553 1235 17023 72 51 52 3 0 17019 203 16798 8 16712 2142 17022 116
Prairies 140693 21348 97278 4541 289 4651 10047 212 91815 1678 24758 86 61 61 53 0 24754 437 25080 121 24447 3338 25304 143
British Columbia 52656 8722 49071 950 184 57 1840 43 48813 1330 11393 73 82 38 105 0 11397 309 11282 147 10858 2195 10835 79
Yukon 850 97 511 2 3 0 14 0 511 16 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 369 40 312 43 4 0 47 0 312 7 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 312 64 N.C. N.C.
Nunavut 1723 206 1068 0 7 103 110 0 1068 43 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 2942 343 1891 45 14 103 171 0 1891 66 N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. 312 64 N.C. N.C.
CANADA 571446 102791 357367 6442 810 7533 15775 416 331857 12603 135199 353 242 271 331 819 135531 2173 135546 835 116930 14524 111695 534

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 19.31 11.76 8.47 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 17.98 12.12 11.29 24.04 0.19 18.07 0.76 9.40 0.24 0.03 0.15 3.18 0.08 1.20 7.09 6.87 8.92 9.47 3.11 6.08
49 2023-12-09 17.45 12.61 13.88 21.12 0.23 19.13 1.43 11.34 0.27 0.06 0.05 4.21 0.19 1.60 7.51 7.29 10.09 12.26 5.40 7.54
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 6.84 4.74 16.64 16.72 12.69 13.84 1.50 3.04 5.78 6.14 3.03 4.18 2.17 1.87 1.89 3.34 1.66 2.49 0.93 1.86 1.48 1.94 0.31 1.09 0.77 3.94 4.94 4.30 1.00 2.04
49 2023-12-09 5.89 4.09 14.57 16.32 10.72 13.07 1.41 3.03 3.97 5.65 2.94 4.19 1.89 1.68 2.48 3.03 1.84 2.50 1.20 1.93 1.22 2.80 0.49 1.48 1.12 4.48 6.58 5.19 0.84 2.53

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 42304 19.31 3490 22.35 12938 21.52 10880 22.17 11422 15.57 3385 11.96 189 6.35
48 2023-12-02 44499 17.98 3648 21.98 13878 22.06 11175 20.05 11910 12.60 3639 10.31 249 7.63
49 2023-12-09 46500 17.45 3654 20.17 14149 22.53 11648 18.66 12390 12.45 4272 10.30 387 7.75

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 29078 8.47 0.11 2521 4.60 0.04 6561 2.04 0.06 8070 2.69 0.02 8277 21.18 0.28 3517 6.43 0.09 132 12.88 0.00
48 2023-12-02 31926 11.29 0.24 2743 4.89 0.11 7199 3.78 0.15 8443 4.41 0.17 9556 24.80 0.42 3836 10.79 0.21 149 29.53 0.00
49 2023-12-09 32760 13.88 0.27 2817 9.66 0.11 8130 7.15 0.12 8462 7.03 0.21 9500 26.64 0.56 3590 13.12 0.11 261 37.16 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 26749 6.88 2363 4.70 4975 11.82 8068 8.66 7766 3.17 3445 5.28 132 11.36
48 2023-12-02 29411 7.09 2549 5.88 5533 11.46 8443 8.49 8954 3.57 3783 6.66 149 8.05
49 2023-12-09 29587 7.51 2665 7.69 5927 11.02 8461 7.40 8798 4.51 3475 9.35 261 6.51

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 10619 1.56 620 1.77 1442 1.04 5708 1.47 1942 1.24 907 3.53
48 2023-12-02 11440 1.50 676 2.37 1587 1.32 5963 1.39 2231 1.03 983 2.95
49 2023-12-09 10840 1.41 668 1.65 1621 1.11 6031 1.43 1774 1.24 746 2.14

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 10667 1.91 620 2.74 1461 3.97 5712 1.07 1941 1.55 911 3.84
48 2023-12-02 11501 2.17 676 3.25 1613 3.84 5963 1.36 2230 2.11 983 3.05
49 2023-12-09 10915 1.89 668 2.84 1640 3.72 6032 1.16 1774 1.47 746 3.62

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 10668 1.02 620 0.97 1442 2.57 5715 0.44 1958 0.66 911 2.96
48 2023-12-02 11473 0.93 676 0.89 1585 2.33 5966 0.47 2227 0.54 983 2.34
49 2023-12-09 10897 1.20 668 1.20 1626 2.46 6037 0.61 1765 2.21 746 0.94

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 9175 7.54 620 11.94 - - 5716 5.86 1934 7.19 883 15.63
48 2023-12-02 9834 6.84 676 9.76 - - 5966 5.20 2197 6.65 959 15.43
49 2023-12-09 9221 5.89 668 6.74 - - 6037 4.51 1766 5.66 695 17.70

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 8816 0.67 620 0.65 1357 0.96 3977 0.55 1979 0.61 883 0.91
48 2023-12-02 9649 0.77 676 0.74 1518 1.05 4242 0.42 2254 0.75 959 1.88
49 2023-12-09 8664 1.12 668 1.20 1510 1.59 4007 0.57 1784 1.46 695 2.30

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