A unique ID assigned to cases by Toronto Public Health for the purposes of posting to Open Data, to allow for tracking of specific cases. Please note, cases may be reclassified or removed from posted datasets over time. This can occur due to duplicate resolution, or other ongoing data cleaning initiatives. In such instances, the Assigned ID of that case will no longer appear on the list and will not get assigned to another case.

Outbreak associated cases are associated with outbreaks of COVID-19 in Toronto healthcare institutions and healthcare settings (e.g. long-term care homes, retirement homes, hospitals, etc.) and other Toronto congregate settings (such as homeless shelters).

Age at time of illness. Age groups (in years): ≤19, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80-89, 90+, unknown (blank)

Toronto is divided into 140 geographically distinct neighborhoods that were established to help government and community agencies with local planning by providing socio-economic data for a meaningful geographic area. Please note that client postal code information is mapped to the most up-to-date census tract (CT) and neighbourhood information available from the city. As a result, neighbourhood information is not available for those with missing postal code or when postal code could not be mapped/linked to a CT.

Forward sortation area (i.e. first three characters of postal code) based on the case's primary home address. FSA values are generated from client postal codes. One FSA can span multiple neighbourhoods.

The most likely way that cases acquired their COVID-19 infection is determined by examining several data fields including:

• A public health investigator's assessment of the most likely source of infection.
• Being associated with a confirmed COVID-19 outbreak
• Reported risk factors such as contact with a known case or travel

If the public health investigator's assessment is absent, then the other data fields are used to infer source of acquisition using the following hierarchy:

Cases with episode dates before April 1 2020: * Travel > Outbreak (settings described below) > Household Contact > Close Contact > Community > No information

Cases with episode dates on or after April 1 2020: * Outbreak (settings described below) > Household Contact > Close Contact > Travel > Community > No information.

Descriptions:

• Household contact: Case who acquired infection from a household contact with a confirmed or probable COVID-19 case (e.g. family member, roommate).
• Close contact with a case: Case who acquired infection from a close contact with a confirmed or probable COVID-19 case (e.g. co-worker).
• Outbreaks: Cases linked to known confirmed COVID-19 outbreaks. These could include the index case who may have acquired the infection elsewhere. Outbreaks settings include:
• Outbreaks, Congregate Settings: confirmed outbreaks in Toronto in shelters, correctional facilities, group homes, or other congregate settings such as hostels or rooming houses.
  • Outbreaks, Healthcare Institutions: confirmed outbreaks in Toronto in long-term care homes, retirement homes, hospitals, chronic care hospitals, or other institutional settings.
  • Outbreaks, Other Settings: confirmed outbreaks in Toronto in workplaces, schools, day cares, or outbreaks outside of Toronto. We do not validate outbreaks that occur in other health units, as such these cases may not be linked to confirmed outbreaks.
• Travel: Case that travelled outside of Ontario in the 14 days prior to their symptom onset or test date, whichever is the earliest.
• Community: Cases who did not travel outside of Ontario, did not identify being a close contact with a COVID-19 case, and were not part of a known confirmed COVID-19 outbreak.
• No information: Cases with no information on the source of infection

The application of the provincial case definition to categorize the cases as confirmed or probable, according to standard criteria. Please refer to the Ontario Ministry of Health website for Ontario's current provincial case definitions.

The episode date is a derived variable that best estimates when the disease was acquired, and refers to the earliest available date from: symptom onset (the first day that COVID-19 symptoms occurred), laboratory specimen collection date, or reported date.

The date on which the case was reported to Toronto Public Health.

Self-reported gender. Gender is a system that operates in a social context and generally classifies people based on their assigned biological sex.

Fatal: Any case that has died and has been marked as Outcome equals 'Fatal' and Type of Death does not equal 'Disease of Public Health Significance was unrelated to cause of death' in the provincial reporting system (CCM).

Resolved: Cases who have:

• A case outcome description in CCM of 'Recovered' OR
• Case outcome description is equal to 'Fatal' AND Type of Death is equal to 'Disease of Public Health Significance was unrelated to cause of death' OR
• Today's date is more than 14 days from episode date AND the case is not currently hospitalized/intubated/in ICU AND Case outcome description is not equal to 'Fatal' where Type of Death is not equal to 'Disease of Public Health Significance was unrelated to cause of death'.

Active: All other cases

Cases that were hospitalized related to their COVID-19 infection (includes cases that are currently hospitalized and those that have been discharged or are deceased).

Cases that were admitted to the intensive care unit (ICU) related to their COVID-19 infection (includes cases that are currently in ICU and those that have been discharged or are deceased).

Cases that were intubated related to their COVID-19 infection (includes cases that are currently intubated and those that have been discharged or deceased)

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