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Status of COVID-19 cases in Halton


Halton’s COVID-19 interactive dashboard provides a summary of the current local situation and information on COVID-19 activity in Halton to date. You can use the dashboard to easily explore Halton’s COVID-19 data on overall case counts, institutional outbreaks and lab testing.

Dashboard changes due to Omicron surge

  • Due to the Omicron surge, testing and case, contact, and outbreak management are now focused on high-risk settings and individuals only. These changes have impacted data completeness and accuracy, including that the number of cases reported in the dashboard is an underestimate of the true number of cases in the community, and outbreaks are underreported.
  • Effective Tuesday, January 25, 2022, the “Case counts”, “Vaccinations”, “Outbreaks”, and “Trends over time” tabs have been updated to remove data that is no longer representative. Additional updates in the coming weeks will include adding new and improved information as we work to provide accurate data that reflects what is available and meaningful given current testing and case/contact management practices.


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Data notes

Data sources

  • Halton case data: Public Health Case and Contact Management (CCM) Solution, extracted Monday-Friday mornings to reflect cases reported by end of the previous day.
  • Halton test volume and percent positivity data: Institute for Clinical Evaluative Sciences, Weekly counts of COVID-19 diagnostic test recipients, received weekly.
  • Halton hospital data: Ministry of Health, SAS Visual Analytics Tool, COVID Regional Hospital and Hospital Utilization reports, extracted Monday to Friday inclusive.
  • Halton vaccination data: IntelliHealth, COVax package, extracted Monday-Friday mornings to reflect immunizations administered by end of the previous day.


  • Numbers should not be expected to match numbers reported by other sources, due to different data extraction times.
  • All data are dynamic and subject to change with future updates.
    • CCM and COVax are dynamic reporting systems which allows ongoing updates to data previously entered.
    • As a result, data extracted from CCM and COVax represent a snapshot at the time of extraction and may differ from previous or subsequent reports.
    • Data are updated once per day. Numbers update dynamically within the dashboard between 12 and 2 PM as server times allow.
    • Based on information gathered while doing case investigation, numbers may increase or decrease daily to reflect our most up to date information. Numbers may change significantly when data cleaning initiatives are completed.
  • The change in the case count reflects the net change from the last update and shows how much higher or lower the count is compared to the most recently published data. As the dashboard is not updated on weekends, the ‘change from last update’ can be expected to be higher on Mondays, as new cases reported on Fridays, Saturdays, and Sundays are captured. The change does not reflect the number of new cases reported per day or when cases’ symptoms began. That information can be viewed in the “Cases over time” graph.
  • All data except hospital occupancy/counts includes only individuals whose main usual residence is in Halton Region. Cases who have municipality information pending are excluded.
  • Probable cases are individuals presumed to have COVID-19 because they have symptoms of COVID-19 and are travelers returning from an affected area, have had close contact with a confirmed case, lived/worked in a facility experiencing a COVID-19 outbreak, had indeterminate test results, or had a preliminary positive result from a Health Canada approved point-of-care assay (rapid COVID-19 test). As of January 1, 2022, probable cases are no longer included in total case counts due to changes in testing and case management necessitated by the Omicron surge.
  • The number of cases should not be considered exactly equivalent to the unique number of individuals in Halton who have been diagnosed with COVID-19, because there are a small number of individuals who are counted twice because they are confirmed reinfection cases. A confirmed reinfection case is a person who has tested positive for COVID-19 twice, with time-based or test-based clearance between the two infections, who has genome sequencing indicating that the two infections are distinct, or for whom the first infection occurred before November 1, 2020 (when variants were rare in Ontario) and the second infection is a confirmed variant of concern or linked to a confirmed case with a variant of concern.
  • Active cases, resolved cases, and deaths are a subset of total cases.
    • Active cases are cases without a ‘fatal’ or ‘recovered’ outcome in CCM whose episode date was within the past 10 days, as well as cases with any episode date who are known to be currently hospitalized.
    • Resolved cases are cases who do not have a ‘fatal’ outcome, are at least 10 days past their episode date, and are not known to be currently hospitalized. Cases closed while hospitalized, and all cases with the outcome of ‘recovered’ regardless of episode date, are also considered resolved.
      • Please note this automated method could result in overestimating the number of resolved cases as it does not take into account the possibility of a case being immunocompromised (which requires a longer period of isolation), and Public Health may not be notified about a case’s hospitalization or lingering severe symptoms (which also can require longer isolation).
    • Deaths include any fatality where the cause of death is recorded as COVID-19 on the death certificate or other official documentation, or fatalities among COVID-19 cases who were still symptomatic/infected with COVID-19 at the time of death; were experiencing residual effects or complications of COVID-19 infection that persisted; and/or were children experiencing multi-system inflammatory syndrome.
    • Case outcomes (resolved cases, deaths) reflect the latest available information reported to Halton Region Public Health and recorded in CCM by the extraction time.
  • The dashboard provides the ability to view cases using either episode date or reported date. Reported date is the date the case was reported to public health. This does not represent the day the case was first publicly reported in the dashboard, and there may be delays between when the case is reported to public health and when it appears in the dashboard (e.g., due to time required to receive confirmatory lab results, or receive a case referral from another health unit). Episode date is a field that is intended to approximate the symptom onset date for each case. It is calculated hierarchically, using the earliest date among symptom onset date; specimen collection date; or the date the case was reported to public health, as available.

Monitoring indicators

  • Hospital occupancy and counts:
    • ICU beds and cases are a subset of acute care beds and cases.
    • Confirmed cases of COVID-19 in this section are individuals who are admitted to the hospital and/or ICU who have tested positive for COVID-19. However, COVID-19 may not be the main cause of their hospitalization.
    • Individuals who are in the hospital who are no longer testing positive for COVID-19 but who previously tested positive will be counted in the occupancy rates, but not in the confirmed hospital case counts.
    • Individuals with COVID-19 who are in Joseph Brant’s Pandemic Response Unit will be included in the confirmed COVID-19 hospital case count, but not in the occupancy rate.
    • Individuals who visited the emergency room but who were not admitted to hospital are not included in the occupancy rates or case counts.
    • Individuals who are admitted to Halton hospitals may not be Halton residents, and conversely, Halton residents may be hospitalized in hospitals outside Halton. Therefore, the counts of COVID-19 patients in hospital/ICU may not always include the same individuals represented as cases elsewhere in the dashboard, which focuses on Halton residents only.
    • Hospital case counts should not be expected to match the data on cases who have ever been hospitalized in the “Case demographics” tab. The hospital case counts include recent data submitted by the hospitals about both Halton residents and non-Halton residents with COVID-19 in their care, whereas the data on the “Case demographics” tab specifically reflects Halton residents only, and depends on hospitalization data for Halton cases being provided to Public Health, which may occur with delay or not at all.
  • Rates and counts are influenced by testing levels, and should be considered in conjunction with the most recent testing counts shown on the “Lab testing” tab. Rates and counts earlier in the pandemic were particularly susceptible to underestimation and changes in testing policy, until testing was made more widely available.
  • For more information on the monitoring indicators, please see the technical notes (PDF file).


  • Our main priority in outbreak management is prevention. Ensuring appropriate measures are being taken requires time, in addition to collecting information on the status of cases. Data on outbreaks may therefore take additional time to be entered and reflected in the dashboard. Out of consideration for those affected, institutional and school outbreaks will also not be posted until after notification of staff, residents, and families has been completed.
  • The name of the affected location is included only for institutional and school outbreaks. The name of the affected location is not shown for congregate living outbreaks for privacy reasons.
  • Outbreaks are declared when the appropriate provincial definition is met. Provincial definitions for outbreaks vary by type of outbreak.
  • Open outbreaks are outbreaks that have not yet been declared over by the time of the dashboard refresh. Closed outbreaks are outbreaks that have been declared over by the time of the dashboard refresh.
  • For information on the types of locations included in each outbreak category and outbreak roles, please use the “What do these mean?” pop-up on the outbreaks page.

Lab testing

  • Test volume and percent positivity data are updated once per week.
  • Test volume and percent positivity data reflect only lab tests that have been assigned to Halton Region or a municipality within Halton based on the methodology used by the Institute for Clinical Evaluative Sciences. There are several considerations associated with these data:
    • The unit of analysis is the testing episode (unique individuals tested per day). Individuals tested multiple times on different days are counted once in each week’s counts for the appropriate weeks.
    • Prior to July 4th, 2021, testing episodes after the individual's first confirmed positive COVID-19 test were excluded from subsequent weekly counts (numerator and denominator). As of July 4th 2021, all testing episodes within 90 days of testing positive are excluded from subsequent weekly counts. After 90 days of testing positive, if an individual is tested again, they are included in the denominator and also the numerator if they test positive again.
    • Testing episodes after the individual's first confirmed positive COVID-19 test are excluded from subsequent weekly counts (numerator and denominator).
    • The COVID-19 test results are captured in the Ontario Laboratories Information System (OLIS). The testing date represents the date of specimen collection. Due to the time required for transportation and processing of specimens, it takes six days for approximately 95% of results to be finalized and reported for a given testing date. Some laboratories do not report all or part of their COVID-19 test results to OLIS. Unconsented test results are excluded.
    • Counts less than six are suppressed.
  • The location of tested individuals was based upon the test recipient’s postal code (and corresponding health unit) recorded in the OHIP Registered Persons Database (RPDB) for those residing outside a long-term care (LTC) facility, and the LTC address on the OLIS test requisition for specimens collected from LTC facilities. These address assignments can lead to misclassification of the health unit.


  • Data on the “Doses administered in Halton” subtab are representative of doses administered anywhere in Halton Region, including community and hospital-based clinics run by Halton Region Public Health, Halton Healthcare, Joseph Brant Hospital, or other partners on a pop-up basis; other clinic settings run by the Halton Region Health Department (which includes Halton Region Public Health and Halton Region Paramedic Services); pharmacies; and physicians’ offices.
  • Data on the “Doses administered in Halton” subtab include both first and second doses, and should therefore not be interpreted as the unique number of individuals vaccinated. The data include doses administered to non-Halton residents (e.g. staff who work at a Halton facility but live outside Halton), and do not include any doses Halton residents may have received outside Halton (e.g. Halton residents who work at facilities outside Halton and were vaccinated there).
  • Data on the “Doses administered in Halton” subtab include individuals without a known age (pending data cleaning), but data on the “Vaccine coverage in Halton residents” subtab excludes such individuals, as known age is required to calculate vaccine coverage.
  • Data on the “Vaccine coverage in Halton residents” subtab reflects Halton residents, rather than doses. It includes both Halton residents who have had just one dose (one-dose coverage), and those who have already had two valid doses (two-dose coverage). It includes known Halton residents who were immunized in Halton, as well as Halton residents who received one or both doses outside Halton, if the dose was recorded in COVax. A second dose is considered valid if it was not given earlier than the product monograph recommends for the specified vaccine product.
  • Vaccine coverage is calculated for the population aged 12 and up, as well as the total population across all age groups (0+).
  • Vaccine coverage is calculated using January 2021 Halton Region population estimates provided by the Institute for Clinical Evaluative Sciences (ICES) based on the Registered Persons Database.
    • Population estimates reflect the postal codes associated with health cards, and therefore are subject to error.
    • For individuals aged 5-17, individuals who did not have any contact with the Ontario health care system in the last 9 years have been excluded, as they likely are not living in the province.
  • Vaccine coverage by Forward Sortation Area (FSA) is available on the ICES COVID-19 Dashboard (external link) under the “Vaccine Coverage in Ontario” heading. FSA is the first three characters of a postal code. The following FSAs are in Halton Region: L0P, L6H, L6J, L6K, L6L, L6M, L7G, L7J, L7L, L7M, L7N, L7P, L7R, L7S, L7T, L9E, L9T.
  • When the record for an individual’s first dose is not available, the individual is shown on the date of their second dose for the time trend graph.
  • Data from COVax are subject to misclassification, as assignment to a health unit of residency is dependent on the postal code entered but can be overwritten, and new postal codes may not be correctly assigned by the system. Halton residents may be misclassified as non-Halton residents and therefore not included in the coverage estimates, and conversely, some non-Halton residents could be erroneously classified as Halton residents depending on the address provided or edits to the health unit field by the immunizer. This is especially true when Halton residents with a newer postal code are immunized outside Halton. Due to these concerns, wherever possible, health unit residency has been assigned outside the system on the basis of postal code and municipality entered into COVax using an updated postal code lookup maintained by Halton Region Public Health. Therefore, individuals with a Halton municipality or postal code in COVax but entered with a different client health unit are assumed to actually be Halton residents; and individuals without a Halton municipality or postal code but entered with a client health unit of Halton are assumed to actually be non-Halton residents. If health unit is missing in COVax, but the reason for immunization involves being a resident of a facility in Halton, the individual is assumed to be a Halton resident.

Trends over time

  • Interpret trends from the most recent days with caution, as information-gathering and data entry is ongoing for recently reported cases.
  • Trends are shown either as the proportion of cases reported in the past 7 days, or as the number of new cases reported in the past 7 days per 100,000 population, for each day of interest.