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COVID-19 in King County WA – July 28 Report

by | Jul 29, 2020

Update from Public Health – Seattle & King County

Public Health has updated the data dashboard. The daily summary shows that there were 14,729 confirmed cases of COVID-19 in King County as of 11:59 on July 27, 110 more than the previous day. There have been 644 confirmed deaths in King County due to COVID-19, 4.4% of all confirmed cases.

The numbers that Public Health reports each day include delayed results from previous days.


The first graph below shows new cases (blue bars) and the 7-day average (red line).  Of the 110 new cases reported today, 107 were confirmed yesterday and the remaining 3 were confirmed in previous days. The 7-day average of new cases per day peaked at 195 on April 1. The average for the last 7 days is now 157 new cases per day, down from 170 a week ago. The 7-day average has decreased 7% in the last week and increased 12% in the last two weeks.

The key indicators that the State and County are using to make decisions about reopening include a measure of the total number of cases reported in the previous 14 days per 100K residents. The target for this metric is less than 25. The second and third graphs below show this metric. The second graph goes back to March 12, the first day on which the metric could be reported. The third graph provides a more detailed view of results in the last several weeks.  102.7 cases were reported per 100K residents during the 14-day period July 14 – 27.

102.7 cases were also reported per 100K residents during the 14-day period that ended on April 11. It took 47 days for that metric to fall below 30, reaching 28.6 on May 28. If it takes another 47 days for the metric to decline from 102.7 to 30, it will reach 30 on September 12.

As of July 21, five of the eight key indicators are not meeting the targets established by the Washington State Department of Health. The key indicators not meeting targets are:

  • Total number of cases for the last 14 days per 100,000 residents.
  • Effective reproductive (Re) number calculated by the Institute for Disease Modeling and Microsoft AI for Health team.
  • Rate of death per 100,000 residents in past 14 days compared to the prior 14 days.
  • Number of people tested for each positive result over the last 7 days.
  • Number of days (median) between illness onset and test date over the last 7 days.