Thursday, April 23, 2020

April 23 - COVID-19 in Westchester County, NY

The New Cases in metro NYC (including Westchester) increased in yesterday's reporting.  Why? More tests.  From the beginning of the epidemic the number of new cases correlated with the number of tests.  More testing, more positives.  This is why I have said from the beginning, testing is not the answer.  (If you could test all 350MM US citizens once a week, it might be valuable.)

The testing rate per capita in Westchester is 75,000 per million. It is so large it does not even fit on the chart below.

Chart from Business Insider


In mid-March, 50% of the tests in Westchester were coming back positive. The testing was doubled, then tripled. They still came back about 50% positive.  Finally the percent testing positive is starting to go down.  This could just be because 10-30% of the population has already recovered from the virus when they were tested.  After all, the virus arrived in Westchester in early February.  It has been here almost three months.




Ohio has a large testing program.  Strangely they prioritized prisoners vs. citizens.  In the Marion prison they tested all 2500 inmates and 80% tested POSITIVE!!!  Only 5% of those testing positive had symptoms. There has only been one death at Marion.

New York metro area supposedly has about 10% of the world's cases.  Why?  Testing density.

Since the start of this pandemic there have been so many incidents that point to a virus that is extremely contagious and largely asymptomatic. But nobody seems to be able to put together a random study to show the extent of those claims. That seems like something the WHO could have done in China???

The noise in the chart of New Cases in the NYC metro area is largely due to the fluctuation in number of tests.  Labs must be dumping large batches of results on certain days.  The chart for NYC which is based on the day of the swab is not as noisy.  The weekends on that chart are clearly visible (less swabbing on Saturday and Sunday?).



Compare the red line above (New Cases plotted on day results received) vs below (New Cases plotted on day patient was swabbed.)




Deaths in Westchester are stuck at 30 per day (orange line).



Bergamo, Italy (comparator city) is recovering, but still has about 50 New Cases diagnosed each day.



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