Influenza News & Resources

FluWatch: Weekly Canadian Influenza Reports 2023 - 2024

FluWatch report: May 12 to May 25, 2024 (weeks 20 and 21)

Highlights: At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year.The percentage of positive tests crossed the seasonal threshold of 5%, indicating the end of the influenza season at the national level in week 19.

Virologic: In week 21, the percentage of tests positive for influenza was 2.0% and a total of 420 laboratory detections (107 influenza A and 313 influenza B) were reported.

FluWatch report: May 5 to May 11, 2024 (week 19)

Weekly Highlights: At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year. The percentage of tests positive for influenza fell below 5% this week. This suggests that Canada is nearing the end of the 2023-2024 influenza season at the national level.

Virologic: In week 19, the percentage of tests positive for influenza was 4.2% and a total of 1,077 laboratory detections (238 influenza A and 839 influenza B) were reported.

FluWatch report: April 28 to May 4, 2024 (week 18)

Weekly Highlights: At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year.

Virologic: In week 18, the percentage of tests positive for influenza was 5.2% and a total of 1,334 laboratory detections (278 influenza A and 1,056 influenza B) were reported.

FluWatch report: April 21 to April 27, 2024 (week 17)

Weekly highlights: At the national level, indicators of influenza activity are decreasing and are  within or below expected levels typical of this time of year.

Virologic: In week 17, the percentage of tests positive for influenza was 5.9% and a total of 1,523 laboratory detections (300 influenza A and 1,223 influenza B) were reported.

FluWatch report: April 14 to April 20, 2024 (week 16)

Weekly highlights: At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year.

Virologic: In week 16, the percentage of tests positive for influenza was 6.4% and a total of 1,647 laboratory detections (348 influenza A and 1,299 influenza B) were reported.

FluWatch report: April 7 to April 13, 2024 (week 15)

Weekly highlights: At the national level, indicators of influenza activity are decreasing and are within or below expected levels typical of this time of year.

Virologic: In week 15, the percentage of tests positive for influenza was 7.8% and a total of 2,254 laboratory detections (525 influenza A and 1,729 influenza B) were reported.

FluWatch report: March 31 to April 6, 2024 (week 14)

Weekly Highlights: At the national level, most indicators of influenza activity are generally decreasing and are within or below expected levels typical of this time of year.

Virologic: In week 14, the percentage of tests positive for influenza was 9.0% and a total of 2,611 laboratory detections (662 influenza A and 1,949 influenza B) were reported.

FluWatch report: March 24 to March 30, 2024 (week 13)

Weekly Highlights: At the national level, most indicators of influenza activity are generally decreasing and are within or below expected levels typical of this time of year.

Virologic: In week 13, the percentage of tests positive for influenza was 9.2% and a total of 2,529 laboratory detections (715 influenza A and 1,814 influenza B) were reported.

FluWatch report: March 17 to March 23, 2024 (week 12)

Weekly Highlights: At the national level, most indicators of influenza activity are generally decreasing and are within or below expected levels typical of this time of year.

Virologic: In week 12, the percentage of tests positive for influenza was 8.9% and a total of 2,448 laboratory detections (897 influenza A and 1,551 influenza B) were reported.

FluWatch report: March 10 to March 16, 2024 (week 11)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 11, the percentage of tests positive for influenza was 9.4% and a total of 2,418 laboratory detections (1,156 influenza A and 1,262 influenza B) were reported.

FluWatch report: March 3 to March 9, 2024 (week 10)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 10, the percentage of tests positive for influenza was 10.7% and a total of 3,134 laboratory detections (1,676 influenza A and 1,458 influenza B) were reported.

FluWatch report: February 25 to March 2, 2024 (week 9)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 9, the percentage of tests positive for influenza was 10.8% and a total of 3,394 laboratory detections (2,144 influenza A and 1,250 influenza B) were reported.

FluWatch report: February 18 to February 24, 2024 (week 8)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 8, the percentage of tests positive for influenza was 11.1% and a total of 3,646 laboratory detections (2,648 influenza A and 998 influenza B) were reported.

FluWatch report: February 11 to February 17, 2024 (week 7)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 7, the percentage of tests positive for influenza was 11.6% and a total of 3,784 laboratory detections (3,099 influenza A and 685 influenza B) were reported.

FluWatch report: February 4 to February 10, 2024 (week 6)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 6, the percentage of tests positive for influenza was 11.8% and a total of 3,840 laboratory detections (3,302 influenza A and 538 influenza B) were reported.

FluWatch report: January 28 to February 3, 2024 (week 5)

Weekly highlights: At the national level, most indicators of influenza activity remained similar compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 5, the percentage of tests positive for influenza was 12.5% and a total of 4,276 laboratory detections (3,783 influenza A and 493 influenza B) were reported.

FluWatch report: January 21 to January 27, 2024 (week 4)

Weekly highlights: At the national level, most indicators of influenza activity remained similar, or slightly increased, compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 4, the percentage of tests positive for influenza was 12.2% and a total of 4,223 laboratory detections (3,863 influenza A and 360 influenza B) were reported.

FluWatch report: January 14 to January 20, 2024 (week 3)

Weekly highlights: At the national level, most indicators of influenza activity remained similar, or decreased slightly, compared to the previous week. All surveillance indicators are within or below expected levels typical of this time of year.

Virologic: In week 3, the percentage of tests positive for influenza was 11.1% and a total of 3,859 laboratory detections (3,590 influenza A and 269 influenza B) were reported.

FluWatch report: January 7, 2023 to January 13, 2024 (week 2)

Weekly highlights: At the national level, influenza activity decreased this week but remain at elevated levels. Most surveillance indicators are decreasing and are within expected levels typical of this time of year.

Virologic: In week 2, the percentage of tests positive for influenza was 11.9% and a total of 4,646 laboratory detections (4,427 influenza A and 219 influenza B) were reported.

FluWatch report: December 31, 2023 to January 6, 2024 (week 1)

Weekly highlights: At the national level, influenza activity decreased this week but remain at elevated levels. Most surveillance indicators are decreasing and are within expected levels typical of this time of year.

Virologic: In week 1, the percentage of tests positive for influenza was 15.0% and a total of 6,215 laboratory detections (5,968 influenza A and 247 influenza B) were reported.

FluWatch report: December 10 to December 30, 2023 (weeks 50-52)

Weekly highlights: At the national level, influenza activity has continued to increase. Most surveillance indicators are increasing but remain within expected levels typical of this time of year.

Virologic: In week 52, the percentage of tests positive for influenza was 18.9% and a total of 7,587 laboratory detections (7,373 influenza A and 214 influenza B) were reported.

FluWatch report: December 3 to December 9, 2023 (week 49)

Weekly highlights: At the national level, influenza activity has continued to increase. Most surveillance indicators are increasing but remain within expected levels typical of this time of year.

Virologic: In week 49, the percentage of tests positive for influenza was 13.2% and a total of 4,323 laboratory detections (4,235 influenza A and 88 influenza B) were reported.

FluWatch report: November 26 to December 2, 2023 (week 48)

Weekly highlights: At the national level, influenza activity has continued to increase. Most surveillance indicators are increasing but remain within expected levels typical of this time of year.

Virologic: In week 48, the percentage of tests positive for influenza was 9.9% and a total of 3,077 laboratory detections (3,009 influenza A and 68 influenza B) were reported.

FluWatch report: November 19 to November 25, 2023 (week 47)

Weekly highlights: At the national level, influenza activity has crossed the seasonal threshold, indicating the start of influenza season. Most surveillance indicators are increasing but remain within expected levels typical of this time of year.

Virologic: In week 47, the percentage of tests positive for influenza was 7.5% and a total of 2,143 laboratory detections (2,115 influenza A and 28 influenza B) were reported.

FluWatch report: November 12 to November 18, 2023 (week 46)

Weekly highlights: At the national level, influenza activity is increasing and has crossed the seasonal threshold of 5% positivity. If percent positivity remains above this threshold next week, the start of the influenza season will be declared. Most surveillance indicators are increasing but remain within expected levels typical of this time of year.

Virologic: In week 46, the percentage of tests positive for influenza was 6.8% and a total of 1,849 laboratory detections (1,811 influenza A and 38 influenza B) were reported.

FluWatch report: November 5 to November 11, 2023 (week 45)

Weekly highlights: At the national level, influenza activity increased this week but overall activity remains below the seasonal threshold. Sporadic influenza activity continues to be reported in many regions across Canada and the number of regions reporting localized activity is increasing.

Virologic: In week 45, the percentage of tests positive for influenza was 4.3% and a total of 1,071 laboratory detections (1,038 influenza A and 33 influenza B) were reported.

FluWatch report: October 29 to November 4, 2023 (week 44)

Weekly highlights: At the national level, influenza activity increased this week but overall activity remains low and below seasonal threshold levels. Sporadic influenza activity is being reported in many regions across Canada.

Virologic: In week 44, the percentage of tests positive for influenza was 2.3% and a total of 544 laboratory detections (523 influenza A and 21 influenza B) were reported.

FluWatch report: October 15, 2023 to October 28, 2023 (weeks 42-43)

Weekly Highlights: At the national level, influenza activity is stable and at inter-seasonal levels. Sporadic influenza activity is being reported in many regions across Canada.

Virologic: In week 43, the percentage of tests positive for influenza was 1.2% and a total of 254 laboratory detections (233 influenza A and 21 influenza B) were reported.

FluWatch report: October 1, 2023 to October 14, 2023 (weeks 40-41)

Weekly Highlights: At the national level, influenza activity is stable and at inter-seasonal levels. Sporadic influenza activity is being reported in many regions across Canada.

Virologic: In week 39, the percentage of tests positive for influenza was 0.6% and a total of 118 laboratory detections (99 influenza A and 19 influenza B) were reported.

FluWatch report: August 27, 2023 to September 30, 2023 (weeks 35-39)

Weekly Highlights: At the national level, influenza activity is stable and at inter-seasonal levels. Sporadic influenza activity is being reported in many regions across Canada.

Virologic: In week 39, the percentage of tests positive for influenza was 0.6% and a total of 118 laboratory detections (99 influenza A and 19 influenza B) were reported

FluWatch report: July 23 to August 26, 2023 (weeks 30-34)

Weekly Highlights: At the national level, influenza activity has been stable and remains at inter-seasonal levels. Sporadic influenza activity continues to be reported in many regions across Canada.

Virologic: In week 34, the percentage of tests positive for influenza was 0.6% and a total of 72 laboratory detections (66 influenza A and 6 influenza B) were reported.

FluWatch report: June 18 to July 22, 2023 (weeks 25-29)

Weekly Highlights: At the national level, influenza activity has been stable and remains at inter-seasonal levels. Sporadic influenza activity continues to be reported in many regions across Canada.

Virologic: In week 29, the percentage of tests positive for influenza was 0.5% and a total of 56 laboratory detections (49 influenza A and 7 influenza B) were reported.

FluWatch report: May 21, 2023 to June 17, 2023 (weeks 21-24)

Weekly Highlights: At the national level, influenza activity has been stable and remains at inter-seasonal levels. Sporadic influenza activity continues to be reported in many regions across Canada.

Virologic: In week 24, the percentage of tests positive for influenza was 1% and a total of 135 laboratory detections (70 influenza A and 65 influenza B) were reported. 

FluWatch report: April 30 to May 20, 2023 (weeks 18-20)

Weekly Highlights: At the national level, influenza activity has been stable and remains at inter-seasonal levels. Sporadic influenza activity continues to be reported in many regions across Canada.

Virologic: In week 20, the percentage of tests positive for influenza was 2.1% and a total of 345 laboratory detections (213 influenza B and 132 influenza A) were reported. Influenza B detections (62%) are predominant.

FluWatch report: April 16 to April 29, 2023 (weeks 16-17)

Weekly Highlights: At the national level, influenza activity has been stable and remains at inter-seasonal levels. Sporadic influenza activity continues to be reported in many regions across Canada.

Virologic: In week 17, the percentage of tests positive for influenza was 2.2% and a total of 448 laboratory detections (362 influenza B and 86 influenza A) were reported. Influenza B detections (81%) are predominant.

FluWatch report: April 2 to April 15, 2023 (weeks 14-15) 

Weekly Highlights: At the national level, influenza activity has increased slightly in recent weeks but remains at inter-seasonal levels. This increase in influenza activity is due to influenza B. Influenza activity continues to be reported in most provinces.

Virologic: In week 15, the percentage of tests positive for influenza was 2.5% and a total of 578 laboratory detections (439 influenza B and 139 influenza A) were reported. Influenza B detections (76%) are predominant.

FluWatch report: March 19 to April 1, 2023 (weeks 12-13)

Weekly Highlights: At the national level, influenza activity has increased slightly in recent weeks but remains at inter-seasonal levels. This increase in influenza activity is due to influenza B. Influenza activity continues to be reported in most provinces.

Virologic: In week 13, the percentage of tests positive for influenza was 2.4% and a total of 510 laboratory detections (364 influenza B and 146 influenza A) were reported. Influenza B detections (71%) are predominant.

FluWatch report: March 5 to March 18, 2023 (weeks 10-11)

Weekly Highlights: At the national level, influenza activity remains low at levels typically seen in late spring/early summer. Influenza activity continues to be reported in most provinces.

Virologic: In week 11, the percentage of tests positive for influenza was 1.6% and a total of 392 laboratory detections (268 influenza B and 124 influenza A) were reported. Influenza B detections (68%) are predominant. Among subtyped influenza A detections in week 11, 74% (23) were influenza A(H1N1).

FluWatch report: February 26 to March 4, 2023 (week 9)

Weekly Highlights: At the national level, influenza activity remains low at levels typically seen in late spring/early summer. Influenza activity continues to be reported in almost all provinces.

Virologic: In week 9, the percentage of tests positive for influenza was 1.3% and a total of 326 laboratory detections (173 influenza B and 153 influenza A) were reported. Influenza A and B are circulating at similar levels. Among subtyped influenza A detections in week 9, 63% (25) were influenza A(H1N1).

FluWatch report: February 19 to February 25, 2023 (week 8)

Weekly Highlights: At the national level, influenza activity remains low at levels typically seen in late spring/early summer. Influenza activity continues to be reported in almost all provinces.

Virologic: In week 8, the percentage of tests positive for influenza was 1.1% and a total of 268 laboratory detections (144 influenza A and 124 influenza B) were reported. The proportion of influenza B detections (46%) has increased in recent weeks. Among subtyped influenza A detections in week 8, 53% (27) were influenza A(H1N1).

FluWatch report: February 12 to February 18, 2023 (week 7)

Weekly Highlights: At the national level, influenza activity remains low at levels typically seen in late spring/early summer. Influenza activity continues to be reported in almost all provinces.

Virologic: In week 7, the percentage of tests positive for influenza was 0.8% and a total of 216 laboratory detections (141 influenza A and 75 influenza B) were reported. The proportion of influenza B detections (35%) has increased in recent weeks. Among subtyped influenza A detections in week 7, 73% (27) were influenza A(H1N1). The proportion of laboratory detections of influenza A(H1N1) has been increasing in recent weeks.

FluWatch report: February 5 to February 11, 2023 (week 6)

Weekly Highlights: At the national level, influenza activity remains low at levels typically seen in late spring/early summer. Influenza activity continues to be reported in almost all provinces.

Virologic: In week 6, the percentage of tests positive for influenza was 1.0% and a total of 282 laboratory detections (190 influenza A and 92 influenza B) were reported. The proportion of influenza B detections (33%) has increased in recent weeks. Among subtyped influenza A detections in week 6, 69% (27) were influenza A(H1N1). The proportion of laboratory detections of influenza A(H1N1) has been increasing in recent weeks. Among detections for which age information (207) was reported in week 6, 56 (27%) of detections were in individuals aged 20-44 years.

FluWatch report: January 29, 2023 to February 4, 2023 (week 5)

Weekly Highlights: Nationally, influenza activity remains low at levels typically seen in late spring and early summer.

Virological: In week 5, the percentage of tests positive for influenza was 1.0% and a total of 285 laboratory detections (206 influenza A cases and 79 influenza B cases) were reported. The proportion of influenza B detections (28%) has increased in recent weeks. Of the influenza A subtyped detections, 60% (34) were influenza A(H1N1). The proportion of laboratory detections of influenza A(H1N1) has increased in recent weeks. Of the detections with age information (213) reported at week 5, 59 (28%) were in people aged 20-44 years.

FluWatch report: January 22 to January 28, 2023 (week 4)

Weekly Highlights: At the national level, influenza activity is low and continues to decline. Influenza activity is at levels typically seen in late spring/early summer.

Virologic: In week 4, the percentage of tests positive for influenza was 1.0% and a total of 290 laboratory detections (249 influenza A and 41 influenza B) were reported. Among subtyped influenza A detections, 54% (34) were influenza A(H3N2) and 46% (29) were influenza A(H1N1). Among detections for which age information was reported in week 4, similar proportions of detections (26%) were in individuals aged 20 to 44 years old and 65+ years old.

FluWatch report: January 15 to January 21, 2023 (week 3)

Weekly Highlights: At the national level, influenza activity continues to decline. Influenza activity is now at levels typically seen in late spring/early summer.

Virologic: In week 3, the percentage of tests positive for influenza was 1.5% and a total of 449 laboratory detections (410 influenza A and 39 influenza B) were reported. Among subtyped influenza A detections in week 3, 52% (44) were influenza A(H1N1) and 48% (41) were influenza A(H3N2). Among detections for which age information was reported in week 3, 33% (119) of detections were in individuals aged 65+ years old.

FluWatch report: January 8 to January 14, 2023 (week 2)

Weekly Highlights: At the national level, influenza activity continues to decline. Influenza activity is now at levels typically seen in late spring/early summer.

Virologic: In week 2, a total of 798 laboratory detections (779 influenza A and 19 influenza B) were reported. Among subtyped influenza A detections in week 2, 71% (116) were influenza A(H3N2) and 29% (47) were influenza A(H1N1). Among detections for which age information was reported in week 2 (495), 47% (234) of detections were in individuals aged 65+ years old.

FluWatch report: January 1 to January 7, 2023 (week 1)

Weekly Highlights: At the national level, influenza continues to circulate but has declined sharply from the peak that occurred in week 47 (end of November) and is now below expected pre-pandemic levels. All surveillance indicators are decreasing and almost all indicators are within expected levels typical of this time of year.

Virologic: In week 1, a total of 1,749 laboratory detections (1,721 influenza A and 28 influenza B) were reported. Among subtyped influenza A detections in week 1, 77% (266) were influenza A(H3N2) and 23% (80) were influenza A(H1N1). Among detections for which age information was reported in week 1 (1,181), 48% (561) of detections were in individuals aged 65+ years old, an increase from 40% (784) in week 52.

FluWatch Reports - Public Health Agency of Canada provides updates on flu activity across the country. Subscriptions to the service are free-of-charge. Reports indicate type of Influenza virus that is circulating in all major regions of the country. Influenza and other respiratory viruses are monitored weekly and results reported every Thursday in the Respiratory Virus Detections in Canada Report. More information is available through the following link: https://www.canada.ca/en/public-health/services/diseases/flu-influenza/influenza-surveillance.html

 

 

 

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