Today’s report on COVID-19 in King County | Wed Apr 22

Today in public health updates, Seattle & King County Public Health describes new research detailing how a rapid response in homeless shelters by public health experts can help protect shelter clients and staff from COVID-19. Also, read about tips for keeping multigenerational families healthy at home.  For the full article and report, visit the Public Health Insider.   

Otherwise, this daily synthesis of the Public Health data is provided by Will Daugherty of Pacific Science Center.  Thanks Will!

Public Health has updated the data dashboard.  As of 11:59 pm yesterday, April 21, there were 5,449 confirmed cases of COVID-19 in King County, 70 more than the previous day.  There have been 379 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 below shows new cases (blue bars) and the 7-day average (red line).  Of the 70 new cases reported today, 63 were confirmed yesterday and the remaining 7 were confirmed in previous days but reported to Public Health in the last day, resulting in restatements of the totals for previous days.  The 7-day average has been in decline since April 1, but the downward trajectory is becoming elongated.  The trailing 7-day average is 96 new cases per day.  This is the same level that it was on March 21 prior to Governor Inslee issuing the “Stay Home, Stay Healthy” order on March 23.

The second graph below shows the total case count.  With 5,449 total cases as of 11:59 pm yesterday, the compound daily growth rate during the last 7 days has been 1.9%, less than the 2.8% rate during the prior 7 days.  At a 1.9% compound daily growth rate, the number of cases doubles every 36.8 days.  One week ago, cases were doubling every 24.7 days.  Two weeks ago, cases were doubling every 14.5 days. Three weeks ago, cases were doubling every 7.8 days.

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.

Will Daugherty welcomes your questions and comments.  His email is