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          With winter break around the corner, you might be looking for some ways to bring STEM (Science, Technology, Engineering, and Math) learning out of the classroom and into your child's daily life. Below is a list of five fun ways to...

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COVID-19 in King County WA – May 20 Report

May 20, 2020

Update from Public Health – Seattle & King County

Public Health has updated the data dashboard. As of 11:59 p.m. yesterday, May 19, there were 7,617 confirmed cases of COVID-19 in King County, 35 more than the previous day. There have been 530 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). 38 new cases were confirmed yesterday. Totals for previous days decreased by 3 cases due to data adjustments by Public Health. The 7-day average of new cases per day peaked at 193 on April 1 (higher than in prior reports due to data adjustments by Public Health). The average for the last 7 days is now 54 new cases per day, the lowest since March 13.

The second graph below shows the total case count. With 7,617 total cases as of 11:59 p.m. yesterday, the compound daily growth rate during the last 7 days has been 0.7%, slightly less than the 0.9% rate during the prior 7 days. 0.7% is a very low daily rate of growth, but a 0.7% growth rate (0.732% to be precise) times 7,617 total cases yields 56 new cases in a day. This is why the red line in the first graph is taking so long to go down. With 7,617 cases, the daily growth rate must be less than 0.131% in order for the number of new cases per day to be less than 10. 0.131% is slightly more than 1/6 of 0.732%. For reference, it took 40 days for the trailing 7-day daily growth rate to fall by that amount from 4.2% on April 9 to 0.7% now.

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.