Is Seattle Flattening The Curve?
ALLAHPUNDITPosted at 6:01 pm on March 19, 2020
he evidence isn’t conclusive yet, but this is worth watching.
UW Virology
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@UWVirology
~2300 tests were reported yesterday from @UWVirology @UWMedicine. Positive rate seems stable. Lab running smoothly the first half of today with lots of results going out. Realtime tracker at
https://depts.washington.edu/uwviro/
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2:26 PM - Mar 18, 2020
The key finding there isn’t that there were fewer positives yesterday than the day before. We can’t know that for sure; at the moment, the data from yesterday includes around half as many tests as the day before so naturally we’d expect fewer positives. The key finding is that even if we assume that there were actually twice as many positives yesterday as the graph indicates, that would be roughly equal to the number of positives on Tuesday. In other words, we’re not seeing exponential growth.
The Seattle Times published this graph tracking infections in Washington state today:
Starting on February 28 and continuing all the way through March 14, in each period the new daily number is at least 50 percent greater than the previous total. But then, on March 16, it slows down slightly: Instead of 1,154 cases on March 18 (which is what we’d expect if the 769 cases on March 14 grew by 50 percent over two days), we see 1,012 cases instead. Yesterday’s number of 1,187 infections is an even lower percentage of the previous total, ALTHOUGH those numbers reflect the total only as of 4 p.m. Seattle time yesterday. The final daily number will doubtless end up bigger.
But it would have to end up a *lot* bigger than 1,187 to keep pace with the “previous day + 50 percent” rule. That would project to 1,518 infections by close of business yesterday. If it falls short of that, this will be circumstantial evidence that Washington state is indeed flattening the proverbial curve via mass social distancing efforts.
Which would make sense. They were the site of the first major outbreak in the U.S., at the Life Care Center nursing home. Washington was also the subject of that genomic analysis early this month that pointed strongly towards undetected community spread locally at a moment when most of the rest of the country was taking COVID-19 in stride. They were hunkered down and distancing themselves before most of the rest of us were. It stands to reason that their curve would be the first to flatten out.
Nate Silver is intrigued too:
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