In Week 02 (week ending January 11, 2025) In Canada, percent positivity is currently highest for influenza, RSV and SARS-CoV-2 (the virus that causes COVID-19).

• COVID-19: Nationally, indicators of COVID-19 activity have been stable.
• Influenza: Nationally, most indicators of influenza activity remained stable from the previous week.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is stable.
• The percent positivity of all other respiratory viruses is following historically observed trends.

In Week 01 (week ending January 4, 2025) In Canada, percent positivity is currently highest for influeza, RSV and SARS-CoV-2 (the virus that causes COVID-19).

• COVID-19: Nationally, indicators of COVID-19 activity have been stable.
• Influenza: Nationally, indicators of influenza activity are increasing.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is stable.
• The percent positivity of all other respiratory viruses is following historically observed trends.

Canadian Respiratory Virus Surveillance Reports - 2024

For more information: https://health-infobase.canada.ca/respiratory-virus-surveillance/#summary

In Week 52 (week ending December 28, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus, SARS-CoV-2 (the virus that causes COVID-19), and RSV.

• COVID-19: Nationally, indicators of COVID-19 activity were stable in week 52.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are increasing.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing
• Enterovirus/rhinovirus percent positivity is decreasing. The percent positivity of all other respiratory viruses is following historically observed trends.

The 2024-2025 Canadian influenza epidemic officially began in week 51 (week ending December 21, 2024)

In Week 51 (week ending December 21, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus, SARS-CoV-2 (the virus that causes COVID-19), and RSV.

• COVID-19: Nationally, indicators of COVID-19 activity were stable in week 1.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are increasing.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing
• Enterovirus/rhinovirus percent positivity is decreasing. The percent positivity of all other respiratory viruses is following historically observed trends.

In Week 50 (week ending December 14, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus, SARS-CoV-2 (the virus that causes COVID-19), and RSV.

• COVID-19: Nationally, indicators of COVID-19 activity were stable in week 50.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are increasing.
  • The threshold to declare the start of a seasonal influenza epidemic in Canada is a 5% positivity rate. Based on historical epidemiological data, Canada will likely reach this threshold in the coming weeks.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing
• Enterovirus/rhinovirus percent positivity is decreasing. The percent positivity of all other respiratory viruses is following historically observed trends.

Report Week 49 (week ending December 7, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19).

• COVID-19: Nationally, indicators of COVID-19 activity continue to decrease.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are increasing.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing.
• Enterovirus/rhinovirus percent positivity is decreasing. The percent positivity of all other respiratory viruses is following historically observed trends.

Report Week 48 (week ending November 30, 2024) in Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19).

• COVID-19: Nationally, indicators of COVID-19 activity are decreasing.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are showing signs of increase.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing.
• Enterovirus/rhinovirus percent positivity is currently stable. The percent positivity of all other respiratory viruses is following historically observed trends.

Report Week 47 (week ending November 23, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19).

• COVID-19: Nationally, indicators of COVID-19 activity are decreasing.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are showing signs of increase.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing.
• Enterovirus/rhinovirus percent positivity is currently stable. The percent positivity of all other respiratory viruses is following historically observed trends.

Report Week 46 (week ending November 16, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19).

• COVID-19: Nationally, indicators of COVID-19 activity are decreasing.
• Influenza: Nationally, indicators of influenza activity remain at interseasonal levels but are showing signs of increase.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is increasing.
• The percent positivity of all other respiratory viruses is following historically observed trends.

Report week 45 (week ending November 9, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

• COVID-19: Nationally, indicators of COVID-19 activity are decreasing; however, trends vary across the provinces and territories.
• Influenza: Nationally, indicators of influenza activity are stable and remain at inter-seasonal levels.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is slowly increasing but remains low.
• The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. Enterovirus/rhinovirus percent positivity is currently stable.

Report week 44 (week ending November 2, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

• COVID-19: Nationally, indicators of COVID-19 activity are stable; however, trends vary across the provinces and territories.
• Influenza: Nationally, indicators of influenza activity are stable and remain at inter-seasonal levels.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is slowly increasing but remains low.
• The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. Enterovirus/rhinovirus percent positivity is decreasing.

For more information: https://health-infobase.canada.ca/respiratory-virus-surveillance/#summary

Report week 43 (week ending October 26, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

• COVID-19: Nationally, indicators of COVID-19 activity are stable; however, trends vary across the provinces and territories.
• Influenza: Nationally, indicators of influenza activity are stable and remain at inter-seasonal levels.
• RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is slowly increasing but remains low.
• The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. Enterovirus/rhinovirus percent positivity is decreasing.

Report week 42 (week ending October 19, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

COVID-19: Nationally, indicators of COVID-19 activity are stable; however trends vary across the provinces and territories.

Influenza: Nationally, indicators of influenza activity are stable and remain at inter-seasonal levels.

RSV: Nationally, respiratory syncytial virus (RSV) percent positivity is slowly increasing but remains low.

The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. Enterovirus/rhinovirus percent positivity is decreasing.

Report week 41 (week ending October 12, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

COVID-19: Nationally, indicators of COVID-19 activity are stable; however trends vary across the provinces and territories.

Influenza: Nationally, indicators of influenza activity are stable and remain at interseasonal levels.

RSV: Nationally, indicators of respiratory syncytial virus (RSV) activity are stable and low.

The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. Enterovirus/rhinovirus percent positivity is stable and is currently similar to levels observed in the same period in previous seasons.

Report: week 40 (week ending October 5, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

COVID-19: Nationally, indicators of COVID-19 activity are stable; however trends vary across the provinces and territories.

Influenza: Nationally, indicators of influenza activity are stable and remain at interseasonal levels.

RSV: Nationally, indicators of respiratory syncytial virus (RSV) activity are stable and low.

The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. 

For more information: https://health-infobase.canada.ca/respiratory-virus-surveillance/#summary

Report: Week 39 (week ending September 28, 2024) In Canada, percent positivity is currently highest for enterovirus/rhinovirus and SARS-CoV-2 (the virus that causes COVID-19). All other respiratory viruses are currently circulating at low levels.

COVID-19: Nationally, indicators of COVID-19 activity are stable; however trends vary across the provinces and territories.

Influenza: Nationally, indicators of influenza activity are stable and remain at inter-seasonal levels.

RSV: Nationally, indicators of respiratory syncytial virus (RSV) activity are stable and low.

The percent positivity of all other respiratory viruses is near expected levels typical of this time of year. Enterovirus/rhinovirus percent positivity is increasing and currently similar to levels observed in the same period in previous seasons.

This is the final FluWatch report which has been replaced by the Canadian respiratory virus surveillance report

FluWatch report: July 21 to August 24, 2024 (week 30-34) (Final)

Weekly highlights: At the national level, indicators of influenza activity are decreasing and remain at inter-seasonal levels.

Virologic: In week 34, the percentage of tests positive for influenza was 0.3% and a total of 57 laboratory detections (47 influenza A and 10 influenza B) were reported.

FluWatch report: June 23, 2024 to July 20, 2024 (week 26-29)

Highlights: At the national level, indicators of influenza activity are decreasing and remain at inter-seasonal levels.

Virologic: In week 29, the percentage of tests positive for influenza was 0.6% and a total of 82 laboratory detections (73 influenza A and 9 influenza B) were reported.

FluWatch report: May 26, 2024 to June 22, 2024 (weeks 22-25)

Weekly highlights: At the national level, indicators of influenza activity are decreasing and remain at inter-seasonal levels.

Virologic: In week 25, the percentage of tests positive for influenza was 1.0% and a total of 160 laboratory detections (114 influenza A and 46 influenza B) were reported.

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 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