COVID-19 Cumulative Cases for Ontario

Contents

Chart 1: Cumulative Known Cases by Day

Chart 2: Cumulative Known Cases by Day (Log Scale)

Chart 3: Daily Increase in Known Cases

Chart 4: Cumulative Known Cases by Status

Chart 5: Cumulative Daily Tests by Test Result

Table 1: Daily COVID-19 Test Results

Daily COVID Testing Status
Date Positive Increase Active Resolved Deceased Negative Pending
2020-03-04 18 17 14 4 0 1,466 78
2020-03-06 22 4 18 4 0 1,665 72
2020-03-08 24 2 20 4 0 1,918 36
2020-03-09 30 6 26 4 0 2,347 22
2020-03-10 31 1 26 5 0 2,599 112
2020-03-11 36 5 31 5 0 2,888 465
2020-03-12 54 18 49 5 0 3,590 536
2020-03-13 74 20 69 5 0 4,470 580
2020-03-14 96 22 91 5 0 5,606 939
2020-03-15 137 41 132 5 0 7,004 1,316
2020-03-16 172 35 167 5 0 8,464 1,537
2020-03-17 180 8 174 5 1 9,415 1,567
2020-03-18 208 28 202 5 1 10,305 3,378
2020-03-19 251 43 245 5 1 12,421 3,972
2020-03-20 301 50 294 5 2 13,718 5,485
2020-03-21 369 68 361 6 2 15,768 7,239
2020-03-22 413 44 402 8 3 17,634 8,361
2020-03-23 489 76 475 8 6 19,586 8,417
2020-03-24 573 84 558 8 7 21,795 10,074
2020-03-25 671 98 654 8 9 24,458 10,489
2020-03-26 837 166 816 8 13 26,727 10,965
2020-03-27 967 130 941 8 18 29,967 10,074
2020-03-28 1,118 151 1,092 8 18 33,240 8,690
2020-03-29 1,326 208 1,297 8 21 40,630 7,203
2020-03-30 1,706 380 1,252 431 23 41,104 5,651
2020-03-31 1,966 260 1,399 534 33 51,629 4,280
2020-04-01 2,392 426 1,666 689 37 52,347 3,135
2020-04-02 2,793 401 1,909 831 53 57,888 2,052
2020-04-03 3,255 462 2,165 1,023 67 62,253 1,245
2020-04-04 3,620 365 2,307 1,219 94 66,372 1,336

Table 2: Presumptive Cases

Presumptive Cases
Date Total Results % Positive Presumed Positive Presumed Total Positive
2020-03-04 1,484 1.21 1 19
2020-03-06 1,687 1.30 1 23
2020-03-08 1,942 1.24 0 24
2020-03-09 2,377 1.26 0 30
2020-03-10 2,630 1.18 1 32
2020-03-11 2,924 1.23 6 42
2020-03-12 3,644 1.48 8 62
2020-03-13 4,544 1.63 9 83
2020-03-14 5,702 1.68 16 112
2020-03-15 7,141 1.92 25 162
2020-03-16 8,636 1.99 31 203
2020-03-17 9,595 1.88 29 209
2020-03-18 10,513 1.98 67 275
2020-03-19 12,672 1.98 79 330
2020-03-20 14,019 2.15 118 419
2020-03-21 16,137 2.29 166 535
2020-03-22 18,047 2.29 191 604
2020-03-23 20,075 2.44 205 694
2020-03-24 22,368 2.56 258 831
2020-03-25 25,129 2.67 280 951
2020-03-26 27,564 3.04 333 1,170
2020-03-27 30,934 3.13 315 1,282
2020-03-28 34,358 3.25 283 1,401
2020-03-29 41,956 3.16 228 1,554
2020-03-30 42,810 3.99 225 1,931
2020-03-31 53,595 3.67 157 2,123
2020-04-01 54,739 4.37 137 2,529
2020-04-02 60,681 4.60 94 2,887
2020-04-03 65,508 4.97 62 3,317
2020-04-04 69,992 5.17 69 3,689

Table 3: Hospitalization Details

Hospitalization Details
date Hospitalized ICU Ventilator
2020-04-04 506 196 152

Notes on Charts and Tables

Data sourced daily from Ontario Ministry of Health COVID-19 Info page.

Note: the Minstry updates the cumulative totals daily but does not break them down by day. I used the Wayback Machine to access snapshots of the page from previous days to get the earlier numbers and have been accessing the live site since March 16.

I was inspired to start tracking this by Hanna Faghfoury, who created a chart up to March 16, and by Patricia Treble at Macleans, who had the idea to use the Wayback Machine to grab previous daily totals.

Updates

Update, 2020-04-04: The Province has finally started publishing hospitalization details: number of people hospitalized, on ICU, and on ICU with ventilator. I include this data in Table 3, and will include a chart once I have more than one day of data.

Update, 2020-04-03: I added a page with national results by province for cumulative confirmed cases and deaths by day.

Update, 2020-04-01: I changed charts 4 and 5 from stacked line to stacked bar. It just seems easier to read this way.

Update 2, 2020-03-31: I added a fifth chart, Cumulative Daily Tests by Test Result. It's a stacked line chart of Positive, Negative and Pending test results by day.

Update, 2020-03-31: The Province has resumed publishing the number of pending cases ("Currently Under Investigation") so I was able to update yesterday's results to include the Pending. And because I know the total tests, the positive and the pending results, I was also able to calculate the negative results and the presumptive case total.

Update 3, 2020-03-30: Please note that the definition of "resolved" has changed. As John Michael McGrath reports: "Before today, 'resolved' meant two separate rests coming back negative; now it means 'not currently listed as hospitalized in iPHIS, those that are 14 days past symptom onset (if present) or 14 days past the episode date if the case is closed.'" So take the new Resolved total with a big grain of salt.

Update 2, 2020-03-30: The Ontario Government COVID-19 test results page changed its format this morning. They no longer list Negative and Pending test results, only Positive and Total tests. As a result, I can no longer determine Total Results (it was Positive + Negative) in order to calculate a Presumed Positive among the Pending test results. If the Province continues not to provide this breakdown, I may retire Table 2.

In addition, the number of Resolved cases was holding steady at 8 for 8 days from March 22 through March 29 and then jumped to 431 today, which suggests the number was not being updated prior to today. You can see the big jump on Chart 4.

Update, 2020-03-30: I added a fourth chart, Cumulative Known Cases by Status: Active, Resolved and Deceased. I calculate Active as Positive (total known cases) minus Resolved and Deceased. I also tweaked the language used in the charts and tables based on an excellent Twitter thread by linguist Dr. Suzanne Wertheim.

Update, 2020-03-27: I replaced the CanvasJS charts with SVG charts generated using the Pygal library in Python.

Update, 2020-03-26: I added a JSON API you can use to download this data.

Update, 2020-03-23: I bit the bullet and added a log chart of cumulative cases by day.

Update, 2020-03-22: I added an "Increase" column to calculate the change in positive cases from the previous day.

Update, 2020-03-21: Out of curiosity, I have added the following calculated fields to the data table:

  • Total Results: sum of the Positive and Negative values and represents all completed tests.
  • % Positive: percent of Total Results that have a Positive test result.
  • Presumed Positive: multplies the Pending value (outstanding tests) by % Positive to estimate how many pending tests will return positive
  • Presumed Total Positive: sum of the Positive and the Presumed Positive values to estimate the total number of positive cases

Please note that these values are not confirmed and should be regarded as speculative. The Presumed Positive and Presumed Total Positive are just estimates based on the assumption that the backlog of tests under investigation has the same percentage of positive cases as the tests that have been returned.

This assumption may not be correct. Specifically, the positive rate from the pending backlog may be lower than the current day, since the backlog spans several previous days and the % positive has been trending upward. As a result, the presumed total may be slightly high.