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Data up to end of day on April 1, 2020


   Confirmed cases over time

53

confirmed COVID-19 cases reported to Halton Region Public Health in the last week (plus 35 preliminary positive results awaiting confirmation)

81

total confirmed COVID-19 cases reported to Halton Region Public Health to date (plus 38 preliminary positive results awaiting confirmation)

Figure 1: Confirmed COVID-19 cases, by reported date, Halton Region, Mar. 1-Apr. 1, 2020
Figure 1 shows the 81 confirmed COVID-19 cases that had been reported to Halton Region Public Health by end of the day on April 1. All cases have been graphed according to the date they were reported, which is often several days after the onset of symptoms. Among the confirmed cases in this figure, 53 cases were reported within the past seven days (Mar. 26-Apr. 1, 2020).

There are an additional 38 individuals from Halton Region with preliminary positive results awaiting confirmatory testing, who are not shown in the graph. Days with more than one preliminary positive result reported have been shaded in orange. Since many of the preliminary positive results were reported in the last few days, this accounts for the lower number of cases on April 1.


   Confirmed case demographics

Figure 2: Confirmed COVID-19 cases, by age and sex, Halton Region, 2020
Figure 2 shows that by end of the day on April 1, the most confirmed COVID-19 cases were among Halton residents aged 45-64 (with 41 cases, or 51%). 45 of the 81 cases (56%) were female.
Figure 3: Confirmed COVID-19 cases, by municipality of residence, Halton Region, 2020
Figure 3 shows that by end of the day on April 1, the greatest number of confirmed COVID-19 cases were among residents of Oakville (with 31 cases, or 38%). Please note that because Burlington and Oakville have larger populations, it is expected that they have more cases.


   Case exposure source

Figure 4: Percentage of confirmed COVID-19 cases, by exposure source, Halton Region, 2020

Figure 4 shows that by end of the day on April 1, 35 of Halton Region’s confirmed COVID-19 cases (43%) had a history of travel that was believed to have been the source of their infection. Two cases (2%) had contact with a confirmed case that was believed to be the source of infection. 22 of the cases (27%) had no known travel or contact history, and therefore were believed to have acquired COVID-19 within Ontario, making them community cases. Information on exposure source was pending for 22 cases (27%).


   Case outcomes

14

confirmed Halton cases of COVID-19 have ever been hospitalized to date

2

confirmed Halton cases of COVID-19 have died to date


   Institutional outbreaks

1

institutional outbreak of COVID-19 in Halton was reported in the last week

1

institutional outbreak of COVID-19 has occurred in Halton to date


   Lab testing

>3,500

Halton residents are known to have been tested for COVID-19 to date


   Comparison to Ontario

2,793

total confirmed COVID-19 cases reported in Ontario to date

Data limitations

Data sources

All Halton case data: integrated Public Health Information System (iPHIS), extracted at 7:00 AM on April 2, 2020, to reflect data entered by the end of the day on April 1, 2020

Lab testing data: Halton Region Public Health, Lab tracking spreadsheet, extracted at 1:00 PM on April 2, 2020

Ontario case data: Public Health Ontario, Epidemiologic Summary, COVID-19 in Ontario: January 15, 2020 to April 1, 2020, posted on April 2, 2020 to https://www.ontario.ca/page/2019-novel-coronavirus

Data notes

All cases of diseases of public health significance diagnosed in Ontario are entered into iPHIS by local public health units. iPHIS is the Integrated Public Health Information System. It is a dynamic disease reporting system which allows ongoing updates to data previously entered. As a result, data extracted from iPHIS represent a snapshot at the time of extraction and may differ from previous or subsequent reports as data are updated.

The data only represent cases reported to public health and recorded in iPHIS. As a result, all counts will be subject to varying degrees of underreporting due to a variety of factors, such as disease awareness and medical care seeking behaviours, which may depend on severity of illness, clinical practice, changes in laboratory testing, and reporting behaviours.

Cases are included if their “diagnosing health unit” in iPHIS is Halton Region, which means counts include only individuals whose primary residence is in Halton Region. The case may not necessarily have been managed by Halton Region, if they were temporarily residing elsewhere during their case management period. Cases managed by Halton Region who normally live elsewhere but who were managed by Halton Region staff because they were temporarily residing in Halton during their case management period have not been included.

Cases for which the Disposition Status in iPHIS was reported as ENTERED IN ERROR, DOES NOT MEET DEFINITION, DUPLICATE-DO NOT USE, or any variation on these values have been excluded.

Only fully lab-confirmed cases are included in this report. 38 cases with preliminary positive results who were still awaiting confirmatory testing as of 7:00 AM on April 2, 2020 have not been included.

In subsequent reports, counts in Figure 1 may increase as cases are added from past dates when they transition from probable to confirmed status due to the arrival of new lab results or case definitions. To minimize such retrospective changes, cases have been graphed according to case reported date, which does not reflect onset of illness.

Exposure type is determined by examining the exposure and risk factor fields from iPHIS to determine whether a case travelled, was a contact of a case or neither. A hierarchy has been applied as follows: Travel-related > Close contact of a confirmed case > Neither (indicating community acquisition) > Information pending.

Case outcomes (hospitalizations, deaths) reflect the latest available information reported to Halton Region Public Health and recorded in iPHIS by the extraction time.

Institutional outbreaks include outbreaks of COVID-19 in settings such as long-term care homes, retirement homes, and prisons.

Lab testing data reflects only lab tests that have been reported to Halton Region Public Health and entered into a tracking spreadsheet. There may be more residents who have been tested but not yet reported to Public Health.

For daily Halton case tables and up-to-date information about how to protect yourself and others, please visit halton.ca/covid19

For daily provincial epidemiologic summaries and more information on COVID-19 in Ontario, please visit Ontario.ca/coronavirus

For national information on COVID-19 in Canada, please visit Canada.ca/coronavirus
Copyright © 2020 Halton Region Health Department, All rights reserved.


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