COVID-19 epidemiology update: Outbreaks:

This page was last updated on .

Change in report

As of October 4, 2024, this webpage will no longer be updated. Information on COVID-19 can now be found on the Canadian respiratory virus surveillance report, where it is presented along other respiratory viruses including Influenza, and RSV.

The Public Health Agency of Canada (PHAC) regularly receives COVID-19 outbreak data from health authorities in the provinces and territories. This page summarizes outbreaks in Canada by setting and by size, and is updated every 4 weeks. Data may change retroactively if there are changes to:

• provincial or territorial COVID-19 testing strategies
• provincial or territorial reporting of outbreaks
• data collection methods, or
• outbreak management methods

What is an outbreak?

Outbreak definitions vary across the country, but we use a national outbreak definition for all outbreaks. An outbreak is 2 or more test-confirmed cases of COVID-19 which are epidemiologically linked to a specific setting or location. It does not include:

• households (since household cases may not be declared or managed as an outbreak if the risk of transmission is contained)
• cases that are geographically clustered (such as in a region, city, or town) but not epidemiologically linked
• cases attributed to community transmission

Test-confirmed cases include positive COVID-19 results from nucleic acid amplification tests (NAAT) or rapid antigen tests (RAT).

In December 2021, the highly contagious Omicron variant caused a rapid increase in cases. This surge affected public health and testing capacity, which led to a change in testing strategies and limited contact tracing. This made it harder for provinces and territories to link cases. As a result, outbreaks were undercounted. The provinces and territories still consistently report cases of COVID-19 in high-priority settings. However, most no longer report cases in community settings, such as schools, recreational facilities and stores.

Three high-priority settings

• Acute care: Hospital or similar setting where patients receive short-term treatment for an injury or severe episode of illness, an urgent medical condition, or during recovery from surgery. Acute care settings include:
  • hospitals
  • emergency departments
  • urgent care
  • transitional care
  • convalescent care
  • short-term inpatient rehabilitation centres
• Congregate living includes:
  • retirement residences
  • assisted/supportive living
  • group homes
  • residential treatment centres
  • transition centres
  • shelters
  • student dormitories
• Long-term care facilities include both public and private facilities that provide living accommodations for people who require full-time supervised care, including professional health services, personal care, and other services (meals, laundry, cleaning)

Showing outbreaks data from to .

We analyzed data for outbreaks occurring between January 02, 2022 and . You can select a narrower date range using the slider below. The data displayed on the rest of this page will change to reflect your date range.

The shaded area on the far right of Figure 1 and Figure 2 represents a period of accumulating data. This is the period of time before the latest outbreaks are reported to PHAC. This delay is a result of the time required to identify cases and declare outbreaks. We update this figure as more data becomes available.

Figure 1. Weekly number of outbreaks by setting

Figure 1: Text description

Figure 2. Weekly number of outbreaks by outbreak size for Select specific outbreak setting:

Figure 2: Text description

Between January 2, 2022 and :

• Acute care accounted for X% of outbreaks.
• Congregate living accounted for X% of outbreaks.
• Long-term care facilities accounted for X% of outbreaks.

Table 1. Summary statistics of COVID-19 outbreak size by setting, all time 2022 2023