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COVID-19 in King County WA – May 21 Report

by | May 21, 2020

Update from Public Health – Seattle & King County

Public Health has updated the data dashboard. As of 11:59 p.m. yesterday, May 20, there were 7,645 confirmed cases of COVID-19 in King County, 28 more than the previous day. There have been 534 confirmed deaths in King County due to COVID-19, 7.0% of all confirmed cases.

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


The first graph above shows new cases (blue bars) and the 7-day average (red line). Of the 28 new cases reported today, 20 were confirmed yesterday and the remaining 8 were confirmed in previous days. The 7-day average of new cases per day peaked at 193 on April 1. The average for the last 7 days is now 47 new cases per day, the same level that it was on March 13. The graph shows the significant (42%) drop in the 7-day average during the last two weeks from 81 on May 6 to 47 on May 20.

The second graph below shows the total case count. With 7,645 total cases as of 11:59 p.m. yesterday, the compound daily growth rate during the last 7 days has been 0.63%, 24 basis points less than the 0.87% rate during the prior 7 days. With 7,645 cases, the daily growth rate must be less than 0.13% in order for the number of new cases per day to be less than 10.

The third graph below shows the trajectory of cases in King County with the total number of cases on the horizontal axis and the new cases on the vertical axis. Each axis is on a logarithmic scale. Each blue dot represents a daily report. The dot farthest to the left is the February 28 report. Time passes from left to right as the total case count grows. The dot farthest to the right is today’s daily report. We can see a clear change in the trajectory since March 28, shortly after Governor Inslee’s “Stay Home, Stay Healthy” order on March 23. We can see the significant downward trajectory in the last two weeks.



Girl with flowers in her hair using a microscope